## Create a Message Batch

`client.Beta.Messages.Batches.New(ctx, params) (*BetaMessageBatch, error)`

**post** `/v1/messages/batches`

Send a batch of Message creation requests.

The Message Batches API can be used to process multiple Messages API requests at once. Once a Message Batch is created, it begins processing immediately. Batches can take up to 24 hours to complete.

Learn more about the Message Batches API in our [user guide](https://docs.claude.com/en/docs/build-with-claude/batch-processing)

### Parameters

- `params BetaMessageBatchNewParams`

  - `Requests param.Field[[]BetaMessageBatchNewParamsRequest]`

    Body param: List of requests for prompt completion. Each is an individual request to create a Message.

    - `CustomID string`

      Developer-provided ID created for each request in a Message Batch. Useful for matching results to requests, as results may be given out of request order.

      Must be unique for each request within the Message Batch.

    - `Params BetaMessageBatchNewParamsRequestParams`

      Messages API creation parameters for the individual request.

      See the [Messages API reference](https://docs.claude.com/en/api/messages) for full documentation on available parameters.

      - `MaxTokens int64`

        The maximum number of tokens to generate before stopping.

        Note that our models may stop _before_ reaching this maximum. This parameter only specifies the absolute maximum number of tokens to generate.

        Set to `0` to populate the [prompt cache](https://docs.claude.com/en/docs/build-with-claude/prompt-caching#pre-warming-the-cache) without generating a response.

        Different models have different maximum values for this parameter.  See [models](https://docs.claude.com/en/docs/models-overview) for details.

      - `Messages []BetaMessageParamResp`

        Input messages.

        Our models are trained to operate on alternating `user` and `assistant` conversational turns. When creating a new `Message`, you specify the prior conversational turns with the `messages` parameter, and the model then generates the next `Message` in the conversation. Consecutive `user` or `assistant` turns in your request will be combined into a single turn.

        Each input message must be an object with a `role` and `content`. You can specify a single `user`-role message, or you can include multiple `user` and `assistant` messages.

        If the final message uses the `assistant` role, the response content will continue immediately from the content in that message. This can be used to constrain part of the model's response.

        Example with a single `user` message:

        ```json
        [{"role": "user", "content": "Hello, Claude"}]
        ```

        Example with multiple conversational turns:

        ```json
        [
          {"role": "user", "content": "Hello there."},
          {"role": "assistant", "content": "Hi, I'm Claude. How can I help you?"},
          {"role": "user", "content": "Can you explain LLMs in plain English?"},
        ]
        ```

        Example with a partially-filled response from Claude:

        ```json
        [
          {"role": "user", "content": "What's the Greek name for Sun? (A) Sol (B) Helios (C) Sun"},
          {"role": "assistant", "content": "The best answer is ("},
        ]
        ```

        Each input message `content` may be either a single `string` or an array of content blocks, where each block has a specific `type`. Using a `string` for `content` is shorthand for an array of one content block of type `"text"`. The following input messages are equivalent:

        ```json
        {"role": "user", "content": "Hello, Claude"}
        ```

        ```json
        {"role": "user", "content": [{"type": "text", "text": "Hello, Claude"}]}
        ```

        See [input examples](https://docs.claude.com/en/api/messages-examples).

        Note that if you want to include a [system prompt](https://docs.claude.com/en/docs/system-prompts), you can use the top-level `system` parameter — there is no `"system"` role for input messages in the Messages API.

        There is a limit of 100,000 messages in a single request.

        - `Content []BetaContentBlockParamUnionResp`

          - `[]BetaContentBlockParamUnionResp`

            - `type BetaTextBlockParamResp struct{…}`

              - `Text string`

              - `Type Text`

                - `const TextText Text = "text"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

                - `Type Ephemeral`

                  - `const EphemeralEphemeral Ephemeral = "ephemeral"`

                - `TTL BetaCacheControlEphemeralTTL`

                  The time-to-live for the cache control breakpoint.

                  This may be one the following values:

                  - `5m`: 5 minutes
                  - `1h`: 1 hour

                  Defaults to `5m`.

                  - `const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"`

                  - `const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"`

              - `Citations []BetaTextCitationParamUnionResp`

                - `type BetaCitationCharLocationParamResp struct{…}`

                  - `CitedText string`

                  - `DocumentIndex int64`

                  - `DocumentTitle string`

                  - `EndCharIndex int64`

                  - `StartCharIndex int64`

                  - `Type CharLocation`

                    - `const CharLocationCharLocation CharLocation = "char_location"`

                - `type BetaCitationPageLocationParamResp struct{…}`

                  - `CitedText string`

                  - `DocumentIndex int64`

                  - `DocumentTitle string`

                  - `EndPageNumber int64`

                  - `StartPageNumber int64`

                  - `Type PageLocation`

                    - `const PageLocationPageLocation PageLocation = "page_location"`

                - `type BetaCitationContentBlockLocationParamResp struct{…}`

                  - `CitedText string`

                    The full text of the cited block range, concatenated.

                    Always equals the contents of `content[start_block_index:end_block_index]` joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.

                  - `DocumentIndex int64`

                  - `DocumentTitle string`

                  - `EndBlockIndex int64`

                    Exclusive 0-based end index of the cited block range in the source's `content` array.

                    Always greater than `start_block_index`; a single-block citation has `end_block_index = start_block_index + 1`.

                  - `StartBlockIndex int64`

                    0-based index of the first cited block in the source's `content` array.

                  - `Type ContentBlockLocation`

                    - `const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"`

                - `type BetaCitationWebSearchResultLocationParamResp struct{…}`

                  - `CitedText string`

                  - `EncryptedIndex string`

                  - `Title string`

                  - `Type WebSearchResultLocation`

                    - `const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"`

                  - `URL string`

                - `type BetaCitationSearchResultLocationParamResp struct{…}`

                  - `CitedText string`

                    The full text of the cited block range, concatenated.

                    Always equals the contents of `content[start_block_index:end_block_index]` joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.

                  - `EndBlockIndex int64`

                    Exclusive 0-based end index of the cited block range in the source's `content` array.

                    Always greater than `start_block_index`; a single-block citation has `end_block_index = start_block_index + 1`.

                  - `SearchResultIndex int64`

                    0-based index of the cited search result among all `search_result` content blocks in the request, in the order they appear across messages and tool results.

                    Counted separately from `document_index`; server-side web search results are not included in this count.

                  - `Source string`

                  - `StartBlockIndex int64`

                    0-based index of the first cited block in the source's `content` array.

                  - `Title string`

                  - `Type SearchResultLocation`

                    - `const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"`

            - `type BetaImageBlockParamResp struct{…}`

              - `Source BetaImageBlockParamSourceUnionResp`

                - `type BetaBase64ImageSource struct{…}`

                  - `Data string`

                  - `MediaType BetaBase64ImageSourceMediaType`

                    - `const BetaBase64ImageSourceMediaTypeImageJPEG BetaBase64ImageSourceMediaType = "image/jpeg"`

                    - `const BetaBase64ImageSourceMediaTypeImagePNG BetaBase64ImageSourceMediaType = "image/png"`

                    - `const BetaBase64ImageSourceMediaTypeImageGIF BetaBase64ImageSourceMediaType = "image/gif"`

                    - `const BetaBase64ImageSourceMediaTypeImageWebP BetaBase64ImageSourceMediaType = "image/webp"`

                  - `Type Base64`

                    - `const Base64Base64 Base64 = "base64"`

                - `type BetaURLImageSource struct{…}`

                  - `Type URL`

                    - `const URLURL URL = "url"`

                  - `URL string`

                - `type BetaFileImageSource struct{…}`

                  - `FileID string`

                  - `Type File`

                    - `const FileFile File = "file"`

              - `Type Image`

                - `const ImageImage Image = "image"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaRequestDocumentBlock struct{…}`

              - `Source BetaRequestDocumentBlockSourceUnion`

                - `type BetaBase64PDFSource struct{…}`

                  - `Data string`

                  - `MediaType ApplicationPDF`

                    - `const ApplicationPDFApplicationPDF ApplicationPDF = "application/pdf"`

                  - `Type Base64`

                    - `const Base64Base64 Base64 = "base64"`

                - `type BetaPlainTextSource struct{…}`

                  - `Data string`

                  - `MediaType TextPlain`

                    - `const TextPlainTextPlain TextPlain = "text/plain"`

                  - `Type Text`

                    - `const TextText Text = "text"`

                - `type BetaContentBlockSource struct{…}`

                  - `Content BetaContentBlockSourceContentUnion`

                    - `string`

                    - `[]BetaContentBlockSourceContentUnion`

                      - `type BetaTextBlockParamResp struct{…}`

                      - `type BetaImageBlockParamResp struct{…}`

                  - `Type Content`

                    - `const ContentContent Content = "content"`

                - `type BetaURLPDFSource struct{…}`

                  - `Type URL`

                    - `const URLURL URL = "url"`

                  - `URL string`

                - `type BetaFileDocumentSource struct{…}`

                  - `FileID string`

                  - `Type File`

                    - `const FileFile File = "file"`

              - `Type Document`

                - `const DocumentDocument Document = "document"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Citations BetaCitationsConfigParamResp`

                - `Enabled bool`

              - `Context string`

              - `Title string`

            - `type BetaSearchResultBlockParamResp struct{…}`

              - `Content []BetaTextBlockParamResp`

                - `Text string`

                - `Type Text`

                - `CacheControl BetaCacheControlEphemeral`

                  Create a cache control breakpoint at this content block.

                - `Citations []BetaTextCitationParamUnionResp`

              - `Source string`

              - `Title string`

              - `Type SearchResult`

                - `const SearchResultSearchResult SearchResult = "search_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Citations BetaCitationsConfigParamResp`

            - `type BetaThinkingBlockParamResp struct{…}`

              - `Signature string`

              - `Thinking string`

              - `Type Thinking`

                - `const ThinkingThinking Thinking = "thinking"`

            - `type BetaRedactedThinkingBlockParamResp struct{…}`

              - `Data string`

              - `Type RedactedThinking`

                - `const RedactedThinkingRedactedThinking RedactedThinking = "redacted_thinking"`

            - `type BetaToolUseBlockParamResp struct{…}`

              - `ID string`

              - `Input map[string, any]`

              - `Name string`

              - `Type ToolUse`

                - `const ToolUseToolUse ToolUse = "tool_use"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Caller BetaToolUseBlockParamCallerUnionResp`

                Tool invocation directly from the model.

                - `type BetaDirectCaller struct{…}`

                  Tool invocation directly from the model.

                  - `Type Direct`

                    - `const DirectDirect Direct = "direct"`

                - `type BetaServerToolCaller struct{…}`

                  Tool invocation generated by a server-side tool.

                  - `ToolID string`

                  - `Type CodeExecution20250825`

                    - `const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"`

                - `type BetaServerToolCaller20260120 struct{…}`

                  - `ToolID string`

                  - `Type CodeExecution20260120`

                    - `const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"`

            - `type BetaToolResultBlockParamResp struct{…}`

              - `ToolUseID string`

              - `Type ToolResult`

                - `const ToolResultToolResult ToolResult = "tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Content []BetaToolResultBlockParamContentUnionResp`

                - `[]BetaToolResultBlockParamContentUnionResp`

                  - `type BetaTextBlockParamResp struct{…}`

                  - `type BetaImageBlockParamResp struct{…}`

                  - `type BetaSearchResultBlockParamResp struct{…}`

                  - `type BetaRequestDocumentBlock struct{…}`

                  - `type BetaToolReferenceBlockParamResp struct{…}`

                    Tool reference block that can be included in tool_result content.

                    - `ToolName string`

                    - `Type ToolReference`

                      - `const ToolReferenceToolReference ToolReference = "tool_reference"`

                    - `CacheControl BetaCacheControlEphemeral`

                      Create a cache control breakpoint at this content block.

              - `IsError bool`

            - `type BetaServerToolUseBlockParamResp struct{…}`

              - `ID string`

              - `Input map[string, any]`

              - `Name BetaServerToolUseBlockParamName`

                - `const BetaServerToolUseBlockParamNameAdvisor BetaServerToolUseBlockParamName = "advisor"`

                - `const BetaServerToolUseBlockParamNameWebSearch BetaServerToolUseBlockParamName = "web_search"`

                - `const BetaServerToolUseBlockParamNameWebFetch BetaServerToolUseBlockParamName = "web_fetch"`

                - `const BetaServerToolUseBlockParamNameCodeExecution BetaServerToolUseBlockParamName = "code_execution"`

                - `const BetaServerToolUseBlockParamNameBashCodeExecution BetaServerToolUseBlockParamName = "bash_code_execution"`

                - `const BetaServerToolUseBlockParamNameTextEditorCodeExecution BetaServerToolUseBlockParamName = "text_editor_code_execution"`

                - `const BetaServerToolUseBlockParamNameToolSearchToolRegex BetaServerToolUseBlockParamName = "tool_search_tool_regex"`

                - `const BetaServerToolUseBlockParamNameToolSearchToolBm25 BetaServerToolUseBlockParamName = "tool_search_tool_bm25"`

              - `Type ServerToolUse`

                - `const ServerToolUseServerToolUse ServerToolUse = "server_tool_use"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Caller BetaServerToolUseBlockParamCallerUnionResp`

                Tool invocation directly from the model.

                - `type BetaDirectCaller struct{…}`

                  Tool invocation directly from the model.

                - `type BetaServerToolCaller struct{…}`

                  Tool invocation generated by a server-side tool.

                - `type BetaServerToolCaller20260120 struct{…}`

            - `type BetaWebSearchToolResultBlockParamResp struct{…}`

              - `Content BetaWebSearchToolResultBlockParamContentUnionResp`

                - `[]BetaWebSearchResultBlockParamResp`

                  - `EncryptedContent string`

                  - `Title string`

                  - `Type WebSearchResult`

                    - `const WebSearchResultWebSearchResult WebSearchResult = "web_search_result"`

                  - `URL string`

                  - `PageAge string`

                - `type BetaWebSearchToolRequestError struct{…}`

                  - `ErrorCode BetaWebSearchToolResultErrorCode`

                    - `const BetaWebSearchToolResultErrorCodeInvalidToolInput BetaWebSearchToolResultErrorCode = "invalid_tool_input"`

                    - `const BetaWebSearchToolResultErrorCodeUnavailable BetaWebSearchToolResultErrorCode = "unavailable"`

                    - `const BetaWebSearchToolResultErrorCodeMaxUsesExceeded BetaWebSearchToolResultErrorCode = "max_uses_exceeded"`

                    - `const BetaWebSearchToolResultErrorCodeTooManyRequests BetaWebSearchToolResultErrorCode = "too_many_requests"`

                    - `const BetaWebSearchToolResultErrorCodeQueryTooLong BetaWebSearchToolResultErrorCode = "query_too_long"`

                    - `const BetaWebSearchToolResultErrorCodeRequestTooLarge BetaWebSearchToolResultErrorCode = "request_too_large"`

                  - `Type WebSearchToolResultError`

                    - `const WebSearchToolResultErrorWebSearchToolResultError WebSearchToolResultError = "web_search_tool_result_error"`

              - `ToolUseID string`

              - `Type WebSearchToolResult`

                - `const WebSearchToolResultWebSearchToolResult WebSearchToolResult = "web_search_tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Caller BetaWebSearchToolResultBlockParamCallerUnionResp`

                Tool invocation directly from the model.

                - `type BetaDirectCaller struct{…}`

                  Tool invocation directly from the model.

                - `type BetaServerToolCaller struct{…}`

                  Tool invocation generated by a server-side tool.

                - `type BetaServerToolCaller20260120 struct{…}`

            - `type BetaWebFetchToolResultBlockParamResp struct{…}`

              - `Content BetaWebFetchToolResultBlockParamContentUnionResp`

                - `type BetaWebFetchToolResultErrorBlockParamResp struct{…}`

                  - `ErrorCode BetaWebFetchToolResultErrorCode`

                    - `const BetaWebFetchToolResultErrorCodeInvalidToolInput BetaWebFetchToolResultErrorCode = "invalid_tool_input"`

                    - `const BetaWebFetchToolResultErrorCodeURLTooLong BetaWebFetchToolResultErrorCode = "url_too_long"`

                    - `const BetaWebFetchToolResultErrorCodeURLNotAllowed BetaWebFetchToolResultErrorCode = "url_not_allowed"`

                    - `const BetaWebFetchToolResultErrorCodeURLNotInPriorContext BetaWebFetchToolResultErrorCode = "url_not_in_prior_context"`

                    - `const BetaWebFetchToolResultErrorCodeURLNotAccessible BetaWebFetchToolResultErrorCode = "url_not_accessible"`

                    - `const BetaWebFetchToolResultErrorCodeUnsupportedContentType BetaWebFetchToolResultErrorCode = "unsupported_content_type"`

                    - `const BetaWebFetchToolResultErrorCodeTooManyRequests BetaWebFetchToolResultErrorCode = "too_many_requests"`

                    - `const BetaWebFetchToolResultErrorCodeMaxUsesExceeded BetaWebFetchToolResultErrorCode = "max_uses_exceeded"`

                    - `const BetaWebFetchToolResultErrorCodeUnavailable BetaWebFetchToolResultErrorCode = "unavailable"`

                  - `Type WebFetchToolResultError`

                    - `const WebFetchToolResultErrorWebFetchToolResultError WebFetchToolResultError = "web_fetch_tool_result_error"`

                - `type BetaWebFetchBlockParamResp struct{…}`

                  - `Content BetaRequestDocumentBlock`

                  - `Type WebFetchResult`

                    - `const WebFetchResultWebFetchResult WebFetchResult = "web_fetch_result"`

                  - `URL string`

                    Fetched content URL

                  - `RetrievedAt string`

                    ISO 8601 timestamp when the content was retrieved

              - `ToolUseID string`

              - `Type WebFetchToolResult`

                - `const WebFetchToolResultWebFetchToolResult WebFetchToolResult = "web_fetch_tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Caller BetaWebFetchToolResultBlockParamCallerUnionResp`

                Tool invocation directly from the model.

                - `type BetaDirectCaller struct{…}`

                  Tool invocation directly from the model.

                - `type BetaServerToolCaller struct{…}`

                  Tool invocation generated by a server-side tool.

                - `type BetaServerToolCaller20260120 struct{…}`

            - `type BetaAdvisorToolResultBlockParamResp struct{…}`

              - `Content BetaAdvisorToolResultBlockParamContentUnionResp`

                - `type BetaAdvisorToolResultErrorParamResp struct{…}`

                  - `ErrorCode BetaAdvisorToolResultErrorParamErrorCode`

                    - `const BetaAdvisorToolResultErrorParamErrorCodeMaxUsesExceeded BetaAdvisorToolResultErrorParamErrorCode = "max_uses_exceeded"`

                    - `const BetaAdvisorToolResultErrorParamErrorCodePromptTooLong BetaAdvisorToolResultErrorParamErrorCode = "prompt_too_long"`

                    - `const BetaAdvisorToolResultErrorParamErrorCodeTooManyRequests BetaAdvisorToolResultErrorParamErrorCode = "too_many_requests"`

                    - `const BetaAdvisorToolResultErrorParamErrorCodeOverloaded BetaAdvisorToolResultErrorParamErrorCode = "overloaded"`

                    - `const BetaAdvisorToolResultErrorParamErrorCodeUnavailable BetaAdvisorToolResultErrorParamErrorCode = "unavailable"`

                    - `const BetaAdvisorToolResultErrorParamErrorCodeExecutionTimeExceeded BetaAdvisorToolResultErrorParamErrorCode = "execution_time_exceeded"`

                    - `const BetaAdvisorToolResultErrorParamErrorCodeModelNotFound BetaAdvisorToolResultErrorParamErrorCode = "model_not_found"`

                  - `Type AdvisorToolResultError`

                    - `const AdvisorToolResultErrorAdvisorToolResultError AdvisorToolResultError = "advisor_tool_result_error"`

                - `type BetaAdvisorResultBlockParamResp struct{…}`

                  - `Text string`

                  - `Type AdvisorResult`

                    - `const AdvisorResultAdvisorResult AdvisorResult = "advisor_result"`

                  - `StopReason string`

                - `type BetaAdvisorRedactedResultBlockParamResp struct{…}`

                  - `EncryptedContent string`

                    Opaque blob produced by a prior response; must be round-tripped verbatim.

                  - `Type AdvisorRedactedResult`

                    - `const AdvisorRedactedResultAdvisorRedactedResult AdvisorRedactedResult = "advisor_redacted_result"`

                  - `StopReason string`

              - `ToolUseID string`

              - `Type AdvisorToolResult`

                - `const AdvisorToolResultAdvisorToolResult AdvisorToolResult = "advisor_tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaCodeExecutionToolResultBlockParamResp struct{…}`

              - `Content BetaCodeExecutionToolResultBlockParamContentUnionResp`

                Code execution result with encrypted stdout for PFC + web_search results.

                - `type BetaCodeExecutionToolResultErrorParamResp struct{…}`

                  - `ErrorCode BetaCodeExecutionToolResultErrorCode`

                    - `const BetaCodeExecutionToolResultErrorCodeInvalidToolInput BetaCodeExecutionToolResultErrorCode = "invalid_tool_input"`

                    - `const BetaCodeExecutionToolResultErrorCodeUnavailable BetaCodeExecutionToolResultErrorCode = "unavailable"`

                    - `const BetaCodeExecutionToolResultErrorCodeTooManyRequests BetaCodeExecutionToolResultErrorCode = "too_many_requests"`

                    - `const BetaCodeExecutionToolResultErrorCodeExecutionTimeExceeded BetaCodeExecutionToolResultErrorCode = "execution_time_exceeded"`

                  - `Type CodeExecutionToolResultError`

                    - `const CodeExecutionToolResultErrorCodeExecutionToolResultError CodeExecutionToolResultError = "code_execution_tool_result_error"`

                - `type BetaCodeExecutionResultBlockParamResp struct{…}`

                  - `Content []BetaCodeExecutionOutputBlockParamResp`

                    - `FileID string`

                    - `Type CodeExecutionOutput`

                      - `const CodeExecutionOutputCodeExecutionOutput CodeExecutionOutput = "code_execution_output"`

                  - `ReturnCode int64`

                  - `Stderr string`

                  - `Stdout string`

                  - `Type CodeExecutionResult`

                    - `const CodeExecutionResultCodeExecutionResult CodeExecutionResult = "code_execution_result"`

                - `type BetaEncryptedCodeExecutionResultBlockParamResp struct{…}`

                  Code execution result with encrypted stdout for PFC + web_search results.

                  - `Content []BetaCodeExecutionOutputBlockParamResp`

                    - `FileID string`

                    - `Type CodeExecutionOutput`

                  - `EncryptedStdout string`

                  - `ReturnCode int64`

                  - `Stderr string`

                  - `Type EncryptedCodeExecutionResult`

                    - `const EncryptedCodeExecutionResultEncryptedCodeExecutionResult EncryptedCodeExecutionResult = "encrypted_code_execution_result"`

              - `ToolUseID string`

              - `Type CodeExecutionToolResult`

                - `const CodeExecutionToolResultCodeExecutionToolResult CodeExecutionToolResult = "code_execution_tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaBashCodeExecutionToolResultBlockParamResp struct{…}`

              - `Content BetaBashCodeExecutionToolResultBlockParamContentUnionResp`

                - `type BetaBashCodeExecutionToolResultErrorParamResp struct{…}`

                  - `ErrorCode BetaBashCodeExecutionToolResultErrorParamErrorCode`

                    - `const BetaBashCodeExecutionToolResultErrorParamErrorCodeInvalidToolInput BetaBashCodeExecutionToolResultErrorParamErrorCode = "invalid_tool_input"`

                    - `const BetaBashCodeExecutionToolResultErrorParamErrorCodeUnavailable BetaBashCodeExecutionToolResultErrorParamErrorCode = "unavailable"`

                    - `const BetaBashCodeExecutionToolResultErrorParamErrorCodeTooManyRequests BetaBashCodeExecutionToolResultErrorParamErrorCode = "too_many_requests"`

                    - `const BetaBashCodeExecutionToolResultErrorParamErrorCodeExecutionTimeExceeded BetaBashCodeExecutionToolResultErrorParamErrorCode = "execution_time_exceeded"`

                    - `const BetaBashCodeExecutionToolResultErrorParamErrorCodeOutputFileTooLarge BetaBashCodeExecutionToolResultErrorParamErrorCode = "output_file_too_large"`

                  - `Type BashCodeExecutionToolResultError`

                    - `const BashCodeExecutionToolResultErrorBashCodeExecutionToolResultError BashCodeExecutionToolResultError = "bash_code_execution_tool_result_error"`

                - `type BetaBashCodeExecutionResultBlockParamResp struct{…}`

                  - `Content []BetaBashCodeExecutionOutputBlockParamResp`

                    - `FileID string`

                    - `Type BashCodeExecutionOutput`

                      - `const BashCodeExecutionOutputBashCodeExecutionOutput BashCodeExecutionOutput = "bash_code_execution_output"`

                  - `ReturnCode int64`

                  - `Stderr string`

                  - `Stdout string`

                  - `Type BashCodeExecutionResult`

                    - `const BashCodeExecutionResultBashCodeExecutionResult BashCodeExecutionResult = "bash_code_execution_result"`

              - `ToolUseID string`

              - `Type BashCodeExecutionToolResult`

                - `const BashCodeExecutionToolResultBashCodeExecutionToolResult BashCodeExecutionToolResult = "bash_code_execution_tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaTextEditorCodeExecutionToolResultBlockParamResp struct{…}`

              - `Content BetaTextEditorCodeExecutionToolResultBlockParamContentUnionResp`

                - `type BetaTextEditorCodeExecutionToolResultErrorParamResp struct{…}`

                  - `ErrorCode BetaTextEditorCodeExecutionToolResultErrorParamErrorCode`

                    - `const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeInvalidToolInput BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "invalid_tool_input"`

                    - `const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeUnavailable BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "unavailable"`

                    - `const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeTooManyRequests BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "too_many_requests"`

                    - `const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeExecutionTimeExceeded BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "execution_time_exceeded"`

                    - `const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeFileNotFound BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "file_not_found"`

                  - `Type TextEditorCodeExecutionToolResultError`

                    - `const TextEditorCodeExecutionToolResultErrorTextEditorCodeExecutionToolResultError TextEditorCodeExecutionToolResultError = "text_editor_code_execution_tool_result_error"`

                  - `ErrorMessage string`

                - `type BetaTextEditorCodeExecutionViewResultBlockParamResp struct{…}`

                  - `Content string`

                  - `FileType BetaTextEditorCodeExecutionViewResultBlockParamFileType`

                    - `const BetaTextEditorCodeExecutionViewResultBlockParamFileTypeText BetaTextEditorCodeExecutionViewResultBlockParamFileType = "text"`

                    - `const BetaTextEditorCodeExecutionViewResultBlockParamFileTypeImage BetaTextEditorCodeExecutionViewResultBlockParamFileType = "image"`

                    - `const BetaTextEditorCodeExecutionViewResultBlockParamFileTypePDF BetaTextEditorCodeExecutionViewResultBlockParamFileType = "pdf"`

                  - `Type TextEditorCodeExecutionViewResult`

                    - `const TextEditorCodeExecutionViewResultTextEditorCodeExecutionViewResult TextEditorCodeExecutionViewResult = "text_editor_code_execution_view_result"`

                  - `NumLines int64`

                  - `StartLine int64`

                  - `TotalLines int64`

                - `type BetaTextEditorCodeExecutionCreateResultBlockParamResp struct{…}`

                  - `IsFileUpdate bool`

                  - `Type TextEditorCodeExecutionCreateResult`

                    - `const TextEditorCodeExecutionCreateResultTextEditorCodeExecutionCreateResult TextEditorCodeExecutionCreateResult = "text_editor_code_execution_create_result"`

                - `type BetaTextEditorCodeExecutionStrReplaceResultBlockParamResp struct{…}`

                  - `Type TextEditorCodeExecutionStrReplaceResult`

                    - `const TextEditorCodeExecutionStrReplaceResultTextEditorCodeExecutionStrReplaceResult TextEditorCodeExecutionStrReplaceResult = "text_editor_code_execution_str_replace_result"`

                  - `Lines []string`

                  - `NewLines int64`

                  - `NewStart int64`

                  - `OldLines int64`

                  - `OldStart int64`

              - `ToolUseID string`

              - `Type TextEditorCodeExecutionToolResult`

                - `const TextEditorCodeExecutionToolResultTextEditorCodeExecutionToolResult TextEditorCodeExecutionToolResult = "text_editor_code_execution_tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaToolSearchToolResultBlockParamResp struct{…}`

              - `Content BetaToolSearchToolResultBlockParamContentUnionResp`

                - `type BetaToolSearchToolResultErrorParamResp struct{…}`

                  - `ErrorCode BetaToolSearchToolResultErrorParamErrorCode`

                    - `const BetaToolSearchToolResultErrorParamErrorCodeInvalidToolInput BetaToolSearchToolResultErrorParamErrorCode = "invalid_tool_input"`

                    - `const BetaToolSearchToolResultErrorParamErrorCodeUnavailable BetaToolSearchToolResultErrorParamErrorCode = "unavailable"`

                    - `const BetaToolSearchToolResultErrorParamErrorCodeTooManyRequests BetaToolSearchToolResultErrorParamErrorCode = "too_many_requests"`

                    - `const BetaToolSearchToolResultErrorParamErrorCodeExecutionTimeExceeded BetaToolSearchToolResultErrorParamErrorCode = "execution_time_exceeded"`

                  - `Type ToolSearchToolResultError`

                    - `const ToolSearchToolResultErrorToolSearchToolResultError ToolSearchToolResultError = "tool_search_tool_result_error"`

                  - `ErrorMessage string`

                - `type BetaToolSearchToolSearchResultBlockParamResp struct{…}`

                  - `ToolReferences []BetaToolReferenceBlockParamResp`

                    - `ToolName string`

                    - `Type ToolReference`

                    - `CacheControl BetaCacheControlEphemeral`

                      Create a cache control breakpoint at this content block.

                  - `Type ToolSearchToolSearchResult`

                    - `const ToolSearchToolSearchResultToolSearchToolSearchResult ToolSearchToolSearchResult = "tool_search_tool_search_result"`

              - `ToolUseID string`

              - `Type ToolSearchToolResult`

                - `const ToolSearchToolResultToolSearchToolResult ToolSearchToolResult = "tool_search_tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaMCPToolUseBlockParamResp struct{…}`

              - `ID string`

              - `Input map[string, any]`

              - `Name string`

              - `ServerName string`

                The name of the MCP server

              - `Type MCPToolUse`

                - `const MCPToolUseMCPToolUse MCPToolUse = "mcp_tool_use"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaRequestMCPToolResultBlockParamResp struct{…}`

              - `ToolUseID string`

              - `Type MCPToolResult`

                - `const MCPToolResultMCPToolResult MCPToolResult = "mcp_tool_result"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Content BetaRequestMCPToolResultBlockParamContentUnionResp`

                - `string`

                - `[]BetaTextBlockParamResp`

                  - `Text string`

                  - `Type Text`

                  - `CacheControl BetaCacheControlEphemeral`

                    Create a cache control breakpoint at this content block.

                  - `Citations []BetaTextCitationParamUnionResp`

              - `IsError bool`

            - `type BetaContainerUploadBlockParamResp struct{…}`

              A content block that represents a file to be uploaded to the container
              Files uploaded via this block will be available in the container's input directory.

              - `FileID string`

              - `Type ContainerUpload`

                - `const ContainerUploadContainerUpload ContainerUpload = "container_upload"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaCompactionBlockParamResp struct{…}`

              A compaction block containing summary of previous context.

              Users should round-trip these blocks from responses to subsequent requests
              to maintain context across compaction boundaries.

              When content is None, the block represents a failed compaction. The server
              treats these as no-ops. Empty string content is not allowed.

              - `Type Compaction`

                - `const CompactionCompaction Compaction = "compaction"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

              - `Content string`

                Summary of previously compacted content, or null if compaction failed

              - `EncryptedContent string`

                Opaque metadata from prior compaction, to be round-tripped verbatim

            - `type BetaMidConversationSystemBlockParamResp struct{…}`

              System instructions that appear mid-conversation.

              Use this block to provide or update system-level instructions at a specific
              point in the conversation, rather than only via the top-level `system` parameter.

              - `Content []BetaTextBlockParamResp`

                System instruction text blocks.

                - `Text string`

                - `Type Text`

                - `CacheControl BetaCacheControlEphemeral`

                  Create a cache control breakpoint at this content block.

                - `Citations []BetaTextCitationParamUnionResp`

              - `Type MidConvSystem`

                - `const MidConvSystemMidConvSystem MidConvSystem = "mid_conv_system"`

              - `CacheControl BetaCacheControlEphemeral`

                Create a cache control breakpoint at this content block.

            - `type BetaFallbackBlockParamResp struct{…}`

              A `fallback` block echoed back from a prior response.

              Accepted in `messages[].content` and never rendered into the prompt,
              not validated against the request's `fallbacks` chain or top-level
              `model`, and stripped before the sticky-routing cache key is computed.

              Callers should echo the assistant turn verbatim — block included. The
              block's position is load-bearing for thinking verification: the thinking
              runs on either side of a fallback hop carry independently-rooted
              verification hash chains, and this block is the only record of where one
              chain ends and the next begins. When thinking runs flank the boundary,
              omitting the block merges the runs into one contiguous span whose hashes
              cannot verify (the request is rejected), and moving it into the middle of
              a single run splits that run's chain and is likewise rejected; between
              non-thinking blocks the block's placement has no verification effect.

              - `From BetaFallbackInfoParamResp`

                Identifies one hop of a fallback transition.

                - `Model Model`

                  The model that will complete your prompt.

                  See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.

                  - `type Model string`

                    The model that will complete your prompt.

                    See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.

                    - `const ModelClaudeFable5 Model = "claude-fable-5"`

                      Next generation of intelligence for the hardest knowledge work and coding problems

                    - `const ModelClaudeMythos5 Model = "claude-mythos-5"`

                      Most capable model for cybersecurity and biology research

                    - `const ModelClaudeOpus4_8 Model = "claude-opus-4-8"`

                      Frontier intelligence for long-running agents and coding

                    - `const ModelClaudeOpus4_7 Model = "claude-opus-4-7"`

                      Frontier intelligence for long-running agents and coding

                    - `const ModelClaudeMythosPreview Model = "claude-mythos-preview"`

                      New class of intelligence, strongest in coding and cybersecurity

                    - `const ModelClaudeOpus4_6 Model = "claude-opus-4-6"`

                      Frontier intelligence for long-running agents and coding

                    - `const ModelClaudeSonnet4_6 Model = "claude-sonnet-4-6"`

                      Best combination of speed and intelligence

                    - `const ModelClaudeHaiku4_5 Model = "claude-haiku-4-5"`

                      Fastest model with near-frontier intelligence

                    - `const ModelClaudeHaiku4_5_20251001 Model = "claude-haiku-4-5-20251001"`

                      Fastest model with near-frontier intelligence

                    - `const ModelClaudeOpus4_5 Model = "claude-opus-4-5"`

                      Premium model combining maximum intelligence with practical performance

                    - `const ModelClaudeOpus4_5_20251101 Model = "claude-opus-4-5-20251101"`

                      Premium model combining maximum intelligence with practical performance

                    - `const ModelClaudeSonnet4_5 Model = "claude-sonnet-4-5"`

                      High-performance model for agents and coding

                    - `const ModelClaudeSonnet4_5_20250929 Model = "claude-sonnet-4-5-20250929"`

                      High-performance model for agents and coding

                    - `const ModelClaudeOpus4_1 Model = "claude-opus-4-1"`

                      Exceptional model for specialized complex tasks

                    - `const ModelClaudeOpus4_1_20250805 Model = "claude-opus-4-1-20250805"`

                      Exceptional model for specialized complex tasks

                    - `const ModelClaudeOpus4_0 Model = "claude-opus-4-0"`

                      Powerful model for complex tasks

                    - `const ModelClaudeOpus4_20250514 Model = "claude-opus-4-20250514"`

                      Powerful model for complex tasks

                    - `const ModelClaudeSonnet4_0 Model = "claude-sonnet-4-0"`

                      High-performance model with extended thinking

                    - `const ModelClaudeSonnet4_20250514 Model = "claude-sonnet-4-20250514"`

                      High-performance model with extended thinking

                    - `const ModelClaude_3_Haiku_20240307 Model = "claude-3-haiku-20240307"`

                      Fast and cost-effective model

                  - `string`

              - `To BetaFallbackInfoParamResp`

                Identifies one hop of a fallback transition.

              - `Type Fallback`

                - `const FallbackFallback Fallback = "fallback"`

        - `Role BetaMessageParamRole`

          - `const BetaMessageParamRoleUser BetaMessageParamRole = "user"`

          - `const BetaMessageParamRoleAssistant BetaMessageParamRole = "assistant"`

          - `const BetaMessageParamRoleSystem BetaMessageParamRole = "system"`

      - `Model Model`

        The model that will complete your prompt.

        See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.

      - `CacheControl BetaCacheControlEphemeral`

        Top-level cache control automatically applies a cache_control marker to the last cacheable block in the request.

      - `Container BetaMessageBatchNewParamsRequestParamsContainerUnion`

        Container identifier for reuse across requests.

        - `type BetaContainerParamsResp struct{…}`

          Container parameters with skills to be loaded.

          - `ID string`

            Container id

          - `Skills []BetaSkillParamsResp`

            List of skills to load in the container

            - `SkillID string`

              Skill ID

            - `Type BetaSkillParamsType`

              Type of skill - either 'anthropic' (built-in) or 'custom' (user-defined)

              - `const BetaSkillParamsTypeAnthropic BetaSkillParamsType = "anthropic"`

              - `const BetaSkillParamsTypeCustom BetaSkillParamsType = "custom"`

            - `Version string`

              Skill version or 'latest' for most recent version

        - `string`

      - `ContextManagement BetaContextManagementConfig`

        Context management configuration.

        This allows you to control how Claude manages context across multiple requests, such as whether to clear function results or not.

        - `Edits []BetaContextManagementConfigEditUnion`

          List of context management edits to apply

          - `type BetaClearToolUses20250919Edit struct{…}`

            - `Type ClearToolUses20250919`

              - `const ClearToolUses20250919ClearToolUses20250919 ClearToolUses20250919 = "clear_tool_uses_20250919"`

            - `ClearAtLeast BetaInputTokensClearAtLeast`

              Minimum number of tokens that must be cleared when triggered. Context will only be modified if at least this many tokens can be removed.

              - `Type InputTokens`

                - `const InputTokensInputTokens InputTokens = "input_tokens"`

              - `Value int64`

            - `ClearToolInputs BetaClearToolUses20250919EditClearToolInputsUnion`

              Whether to clear all tool inputs (bool) or specific tool inputs to clear (list)

              - `bool`

              - `[]string`

            - `ExcludeTools []string`

              Tool names whose uses are preserved from clearing

            - `Keep BetaToolUsesKeep`

              Number of tool uses to retain in the conversation

              - `Type ToolUses`

                - `const ToolUsesToolUses ToolUses = "tool_uses"`

              - `Value int64`

            - `Trigger BetaClearToolUses20250919EditTriggerUnion`

              Condition that triggers the context management strategy

              - `type BetaInputTokensTrigger struct{…}`

                - `Type InputTokens`

                  - `const InputTokensInputTokens InputTokens = "input_tokens"`

                - `Value int64`

              - `type BetaToolUsesTrigger struct{…}`

                - `Type ToolUses`

                  - `const ToolUsesToolUses ToolUses = "tool_uses"`

                - `Value int64`

          - `type BetaClearThinking20251015Edit struct{…}`

            - `Type ClearThinking20251015`

              - `const ClearThinking20251015ClearThinking20251015 ClearThinking20251015 = "clear_thinking_20251015"`

            - `Keep BetaClearThinking20251015EditKeepUnion`

              Number of most recent assistant turns to keep thinking blocks for. Older turns will have their thinking blocks removed.

              - `type BetaThinkingTurns struct{…}`

                - `Type ThinkingTurns`

                  - `const ThinkingTurnsThinkingTurns ThinkingTurns = "thinking_turns"`

                - `Value int64`

              - `type BetaAllThinkingTurns struct{…}`

                - `Type All`

                  - `const AllAll All = "all"`

              - `All`

                - `const AllAll All = "all"`

          - `type BetaCompact20260112Edit struct{…}`

            Automatically compact older context when reaching the configured trigger threshold.

            - `Type Compact20260112`

              - `const Compact20260112Compact20260112 Compact20260112 = "compact_20260112"`

            - `Instructions string`

              Additional instructions for summarization.

            - `PauseAfterCompaction bool`

              Whether to pause after compaction and return the compaction block to the user.

            - `Trigger BetaInputTokensTrigger`

              When to trigger compaction. Defaults to 150000 input tokens.

      - `Diagnostics BetaDiagnosticsParamResp`

        Request-level diagnostics. Currently carries the previous response
        id for prompt-cache divergence reporting.

        - `PreviousMessageID string`

          The `id` (`msg_...`) from this client's previous /v1/messages response. The server compares that request's prompt fingerprint against this one and returns `diagnostics.cache_miss_reason` when the prompt-cache prefix could not be reused. Pass `null` on the first turn to opt in without a prior message to compare.

      - `FallbackCreditToken string`

        The `fallback_credit_token` from a prior refusal's `stop_details`.

        When a preceding request was refused and returned a `fallback_credit_token`,
        pass that code here on the retry to have the retry's cache-creation tokens
        for the prefix that was warm on the refused model billed at the cache-read
        rate. Must be redeemed by the same organization and workspace, with the same
        request body (optionally extended by one appended `assistant` message whose
        content is the partial text — with any trailing whitespace stripped from
        the final text block — and paired server-tool blocks streamed before the
        refusal; the appended-assistant form is not available for requests with
        `output_format` set or forced `tool_choice`), on an eligible fallback
        model, on the same platform,
        and within 5 minutes of the refusal; a mismatch is a 400. A token minted
        mid-server-tool-loop whose partial content was continuable may only be
        redeemed with the appended-assistant form — if an exact-body retry is
        rejected with a 400 saying the token must be redeemed by continuing the
        partial response, retry with the appended-assistant form instead.

        When the appended-assistant form is used on a model that otherwise disallows
        assistant-turn prefill, this token also authorizes that one prefill.

      - `Fallbacks []BetaFallbackParamResp`

        Opt-in server-side retry on one or more substitute models when the requested model declines for policy reasons. Tried in order: if the first entry also declines, the second is tried, and so on.

        - `Model Model`

          The model that will complete your prompt.

          See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.

        - `MaxTokens int64`

        - `OutputConfig BetaOutputConfig`

          - `Effort BetaOutputConfigEffort`

            All possible effort levels.

            - `const BetaOutputConfigEffortLow BetaOutputConfigEffort = "low"`

            - `const BetaOutputConfigEffortMedium BetaOutputConfigEffort = "medium"`

            - `const BetaOutputConfigEffortHigh BetaOutputConfigEffort = "high"`

            - `const BetaOutputConfigEffortXhigh BetaOutputConfigEffort = "xhigh"`

            - `const BetaOutputConfigEffortMax BetaOutputConfigEffort = "max"`

          - `Format BetaJSONOutputFormat`

            A schema to specify Claude's output format in responses. See [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs)

            - `Schema map[string, any]`

              The JSON schema of the format

            - `Type JSONSchema`

              - `const JSONSchemaJSONSchema JSONSchema = "json_schema"`

          - `TaskBudget BetaTokenTaskBudget`

            User-configurable total token budget across contexts.

            - `Total int64`

              Total token budget across all contexts in the session.

            - `Type Tokens`

              The budget type. Currently only 'tokens' is supported.

              - `const TokensTokens Tokens = "tokens"`

            - `Remaining int64`

              Remaining tokens in the budget. Use this to track usage across contexts when implementing compaction client-side. Defaults to total if not provided.

        - `Speed BetaFallbackParamSpeed`

          - `const BetaFallbackParamSpeedStandard BetaFallbackParamSpeed = "standard"`

          - `const BetaFallbackParamSpeedFast BetaFallbackParamSpeed = "fast"`

        - `Thinking BetaFallbackParamThinkingUnionResp`

          - `type BetaThinkingConfigEnabled struct{…}`

            - `BudgetTokens int64`

              Determines how many tokens Claude can use for its internal reasoning process. Larger budgets can enable more thorough analysis for complex problems, improving response quality.

              Must be ≥1024 and less than `max_tokens`.

              See [extended thinking](https://docs.claude.com/en/docs/build-with-claude/extended-thinking) for details.

            - `Type Enabled`

              - `const EnabledEnabled Enabled = "enabled"`

            - `Display BetaThinkingConfigEnabledDisplay`

              Controls how thinking content appears in the response. When set to `summarized`, thinking is returned normally. When set to `omitted`, thinking content is redacted but a signature is returned for multi-turn continuity. Defaults to `summarized`.

              - `const BetaThinkingConfigEnabledDisplaySummarized BetaThinkingConfigEnabledDisplay = "summarized"`

              - `const BetaThinkingConfigEnabledDisplayOmitted BetaThinkingConfigEnabledDisplay = "omitted"`

          - `type BetaThinkingConfigDisabled struct{…}`

            - `Type Disabled`

              - `const DisabledDisabled Disabled = "disabled"`

          - `type BetaThinkingConfigAdaptive struct{…}`

            - `Type Adaptive`

              - `const AdaptiveAdaptive Adaptive = "adaptive"`

            - `Display BetaThinkingConfigAdaptiveDisplay`

              Controls how thinking content appears in the response. When set to `summarized`, thinking is returned normally. When set to `omitted`, thinking content is redacted but a signature is returned for multi-turn continuity. Defaults to `summarized`.

              - `const BetaThinkingConfigAdaptiveDisplaySummarized BetaThinkingConfigAdaptiveDisplay = "summarized"`

              - `const BetaThinkingConfigAdaptiveDisplayOmitted BetaThinkingConfigAdaptiveDisplay = "omitted"`

      - `InferenceGeo string`

        Specifies the geographic region for inference processing. If not specified, the workspace's `default_inference_geo` is used.

      - `MCPServers []BetaRequestMCPServerURLDefinition`

        MCP servers to be utilized in this request

        - `Name string`

        - `Type URL`

          - `const URLURL URL = "url"`

        - `URL string`

        - `AuthorizationToken string`

        - `ToolConfiguration BetaRequestMCPServerToolConfiguration`

          - `AllowedTools []string`

          - `Enabled bool`

      - `Metadata BetaMetadata`

        An object describing metadata about the request.

        - `UserID string`

          An external identifier for the user who is associated with the request.

          This should be a uuid, hash value, or other opaque identifier. Anthropic may use this id to help detect abuse. Do not include any identifying information such as name, email address, or phone number.

      - `OutputConfig BetaOutputConfig`

        Configuration options for the model's output, such as the output format.

      - `OutputFormat BetaJSONOutputFormat`

        Deprecated: Use `output_config.format` instead. See [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs)

        A schema to specify Claude's output format in responses. This parameter will be removed in a future release.

      - `ServiceTier string`

        Determines whether to use priority capacity (if available) or standard capacity for this request.

        Anthropic offers different levels of service for your API requests. See [service-tiers](https://docs.claude.com/en/api/service-tiers) for details.

        - `const BetaMessageBatchNewParamsRequestParamsServiceTierAuto BetaMessageBatchNewParamsRequestParamsServiceTier = "auto"`

        - `const BetaMessageBatchNewParamsRequestParamsServiceTierStandardOnly BetaMessageBatchNewParamsRequestParamsServiceTier = "standard_only"`

      - `Speed string`

        The inference speed mode for this request. `"fast"` enables high output-tokens-per-second inference.

        - `const BetaMessageBatchNewParamsRequestParamsSpeedStandard BetaMessageBatchNewParamsRequestParamsSpeed = "standard"`

        - `const BetaMessageBatchNewParamsRequestParamsSpeedFast BetaMessageBatchNewParamsRequestParamsSpeed = "fast"`

      - `StopSequences []string`

        Custom text sequences that will cause the model to stop generating.

        Our models will normally stop when they have naturally completed their turn, which will result in a response `stop_reason` of `"end_turn"`.

        If you want the model to stop generating when it encounters custom strings of text, you can use the `stop_sequences` parameter. If the model encounters one of the custom sequences, the response `stop_reason` value will be `"stop_sequence"` and the response `stop_sequence` value will contain the matched stop sequence.

      - `Stream bool`

        Whether to incrementally stream the response using server-sent events.

        See [streaming](https://docs.claude.com/en/api/messages-streaming) for details.

      - `System []BetaTextBlockParamResp`

        System prompt.

        A system prompt is a way of providing context and instructions to Claude, such as specifying a particular goal or role. See our [guide to system prompts](https://docs.claude.com/en/docs/system-prompts).

        - `[]BetaTextBlockParam`

          - `Text string`

          - `Type Text`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `Citations []BetaTextCitationParamUnionResp`

      - `Temperature float64`

        Amount of randomness injected into the response.

        Defaults to `1.0`. Ranges from `0.0` to `1.0`. Use `temperature` closer to `0.0` for analytical / multiple choice, and closer to `1.0` for creative and generative tasks.

        Note that even with `temperature` of `0.0`, the results will not be fully deterministic.

      - `Thinking BetaThinkingConfigParamUnionResp`

        Configuration for enabling Claude's extended thinking.

        When enabled, responses include `thinking` content blocks showing Claude's thinking process before the final answer. Requires a minimum budget of 1,024 tokens and counts towards your `max_tokens` limit.

        See [extended thinking](https://docs.claude.com/en/docs/build-with-claude/extended-thinking) for details.

        - `type BetaThinkingConfigEnabled struct{…}`

        - `type BetaThinkingConfigDisabled struct{…}`

        - `type BetaThinkingConfigAdaptive struct{…}`

      - `ToolChoice BetaToolChoiceUnion`

        How the model should use the provided tools. The model can use a specific tool, any available tool, decide by itself, or not use tools at all.

        - `type BetaToolChoiceAuto struct{…}`

          The model will automatically decide whether to use tools.

          - `Type Auto`

            - `const AutoAuto Auto = "auto"`

          - `DisableParallelToolUse bool`

            Whether to disable parallel tool use.

            Defaults to `false`. If set to `true`, the model will output at most one tool use.

        - `type BetaToolChoiceAny struct{…}`

          The model will use any available tools.

          - `Type Any`

            - `const AnyAny Any = "any"`

          - `DisableParallelToolUse bool`

            Whether to disable parallel tool use.

            Defaults to `false`. If set to `true`, the model will output exactly one tool use.

        - `type BetaToolChoiceTool struct{…}`

          The model will use the specified tool with `tool_choice.name`.

          - `Name string`

            The name of the tool to use.

          - `Type Tool`

            - `const ToolTool Tool = "tool"`

          - `DisableParallelToolUse bool`

            Whether to disable parallel tool use.

            Defaults to `false`. If set to `true`, the model will output exactly one tool use.

        - `type BetaToolChoiceNone struct{…}`

          The model will not be allowed to use tools.

          - `Type None`

            - `const NoneNone None = "none"`

      - `Tools []BetaToolUnion`

        Definitions of tools that the model may use.

        If you include `tools` in your API request, the model may return `tool_use` content blocks that represent the model's use of those tools. You can then run those tools using the tool input generated by the model and then optionally return results back to the model using `tool_result` content blocks.

        There are two types of tools: **client tools** and **server tools**. The behavior described below applies to client tools. For [server tools](https://docs.claude.com/en/docs/agents-and-tools/tool-use/overview#server-tools), see their individual documentation as each has its own behavior (e.g., the [web search tool](https://docs.claude.com/en/docs/agents-and-tools/tool-use/web-search-tool)).

        Each tool definition includes:

        * `name`: Name of the tool.
        * `description`: Optional, but strongly-recommended description of the tool.
        * `input_schema`: [JSON schema](https://json-schema.org/draft/2020-12) for the tool `input` shape that the model will produce in `tool_use` output content blocks.

        For example, if you defined `tools` as:

        ```json
        [
          {
            "name": "get_stock_price",
            "description": "Get the current stock price for a given ticker symbol.",
            "input_schema": {
              "type": "object",
              "properties": {
                "ticker": {
                  "type": "string",
                  "description": "The stock ticker symbol, e.g. AAPL for Apple Inc."
                }
              },
              "required": ["ticker"]
            }
          }
        ]
        ```

        And then asked the model "What's the S&P 500 at today?", the model might produce `tool_use` content blocks in the response like this:

        ```json
        [
          {
            "type": "tool_use",
            "id": "toolu_01D7FLrfh4GYq7yT1ULFeyMV",
            "name": "get_stock_price",
            "input": { "ticker": "^GSPC" }
          }
        ]
        ```

        You might then run your `get_stock_price` tool with `{"ticker": "^GSPC"}` as an input, and return the following back to the model in a subsequent `user` message:

        ```json
        [
          {
            "type": "tool_result",
            "tool_use_id": "toolu_01D7FLrfh4GYq7yT1ULFeyMV",
            "content": "259.75 USD"
          }
        ]
        ```

        Tools can be used for workflows that include running client-side tools and functions, or more generally whenever you want the model to produce a particular JSON structure of output.

        See our [guide](https://docs.claude.com/en/docs/tool-use) for more details.

        - `type BetaTool struct{…}`

          - `InputSchema BetaToolInputSchema`

            [JSON schema](https://json-schema.org/draft/2020-12) for this tool's input.

            This defines the shape of the `input` that your tool accepts and that the model will produce.

            - `Type Object`

              - `const ObjectObject Object = "object"`

            - `Properties map[string, any]`

            - `Required []string`

          - `Name string`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

          - `AllowedCallers []string`

            - `const BetaToolAllowedCallerDirect BetaToolAllowedCaller = "direct"`

            - `const BetaToolAllowedCallerCodeExecution20250825 BetaToolAllowedCaller = "code_execution_20250825"`

            - `const BetaToolAllowedCallerCodeExecution20260120 BetaToolAllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `Description string`

            Description of what this tool does.

            Tool descriptions should be as detailed as possible. The more information that the model has about what the tool is and how to use it, the better it will perform. You can use natural language descriptions to reinforce important aspects of the tool input JSON schema.

          - `EagerInputStreaming bool`

            Enable eager input streaming for this tool. When true, tool input parameters will be streamed incrementally as they are generated, and types will be inferred on-the-fly rather than buffering the full JSON output. When false, streaming is disabled for this tool even if the fine-grained-tool-streaming beta is active. When null (default), uses the default behavior based on beta headers.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

          - `Type BetaToolType`

            - `const BetaToolTypeCustom BetaToolType = "custom"`

        - `type BetaToolBash20241022 struct{…}`

          - `Name Bash`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const BashBash Bash = "bash"`

          - `Type Bash20241022`

            - `const Bash20241022Bash20241022 Bash20241022 = "bash_20241022"`

          - `AllowedCallers []string`

            - `const BetaToolBash20241022AllowedCallerDirect BetaToolBash20241022AllowedCaller = "direct"`

            - `const BetaToolBash20241022AllowedCallerCodeExecution20250825 BetaToolBash20241022AllowedCaller = "code_execution_20250825"`

            - `const BetaToolBash20241022AllowedCallerCodeExecution20260120 BetaToolBash20241022AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolBash20250124 struct{…}`

          - `Name Bash`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const BashBash Bash = "bash"`

          - `Type Bash20250124`

            - `const Bash20250124Bash20250124 Bash20250124 = "bash_20250124"`

          - `AllowedCallers []string`

            - `const BetaToolBash20250124AllowedCallerDirect BetaToolBash20250124AllowedCaller = "direct"`

            - `const BetaToolBash20250124AllowedCallerCodeExecution20250825 BetaToolBash20250124AllowedCaller = "code_execution_20250825"`

            - `const BetaToolBash20250124AllowedCallerCodeExecution20260120 BetaToolBash20250124AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaCodeExecutionTool20250522 struct{…}`

          - `Name CodeExecution`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const CodeExecutionCodeExecution CodeExecution = "code_execution"`

          - `Type CodeExecution20250522`

            - `const CodeExecution20250522CodeExecution20250522 CodeExecution20250522 = "code_execution_20250522"`

          - `AllowedCallers []string`

            - `const BetaCodeExecutionTool20250522AllowedCallerDirect BetaCodeExecutionTool20250522AllowedCaller = "direct"`

            - `const BetaCodeExecutionTool20250522AllowedCallerCodeExecution20250825 BetaCodeExecutionTool20250522AllowedCaller = "code_execution_20250825"`

            - `const BetaCodeExecutionTool20250522AllowedCallerCodeExecution20260120 BetaCodeExecutionTool20250522AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaCodeExecutionTool20250825 struct{…}`

          - `Name CodeExecution`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const CodeExecutionCodeExecution CodeExecution = "code_execution"`

          - `Type CodeExecution20250825`

            - `const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"`

          - `AllowedCallers []string`

            - `const BetaCodeExecutionTool20250825AllowedCallerDirect BetaCodeExecutionTool20250825AllowedCaller = "direct"`

            - `const BetaCodeExecutionTool20250825AllowedCallerCodeExecution20250825 BetaCodeExecutionTool20250825AllowedCaller = "code_execution_20250825"`

            - `const BetaCodeExecutionTool20250825AllowedCallerCodeExecution20260120 BetaCodeExecutionTool20250825AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaCodeExecutionTool20260120 struct{…}`

          Code execution tool with REPL state persistence (daemon mode + gVisor checkpoint).

          - `Name CodeExecution`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const CodeExecutionCodeExecution CodeExecution = "code_execution"`

          - `Type CodeExecution20260120`

            - `const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"`

          - `AllowedCallers []string`

            - `const BetaCodeExecutionTool20260120AllowedCallerDirect BetaCodeExecutionTool20260120AllowedCaller = "direct"`

            - `const BetaCodeExecutionTool20260120AllowedCallerCodeExecution20250825 BetaCodeExecutionTool20260120AllowedCaller = "code_execution_20250825"`

            - `const BetaCodeExecutionTool20260120AllowedCallerCodeExecution20260120 BetaCodeExecutionTool20260120AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolComputerUse20241022 struct{…}`

          - `DisplayHeightPx int64`

            The height of the display in pixels.

          - `DisplayWidthPx int64`

            The width of the display in pixels.

          - `Name Computer`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const ComputerComputer Computer = "computer"`

          - `Type Computer20241022`

            - `const Computer20241022Computer20241022 Computer20241022 = "computer_20241022"`

          - `AllowedCallers []string`

            - `const BetaToolComputerUse20241022AllowedCallerDirect BetaToolComputerUse20241022AllowedCaller = "direct"`

            - `const BetaToolComputerUse20241022AllowedCallerCodeExecution20250825 BetaToolComputerUse20241022AllowedCaller = "code_execution_20250825"`

            - `const BetaToolComputerUse20241022AllowedCallerCodeExecution20260120 BetaToolComputerUse20241022AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `DisplayNumber int64`

            The X11 display number (e.g. 0, 1) for the display.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaMemoryTool20250818 struct{…}`

          - `Name Memory`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const MemoryMemory Memory = "memory"`

          - `Type Memory20250818`

            - `const Memory20250818Memory20250818 Memory20250818 = "memory_20250818"`

          - `AllowedCallers []string`

            - `const BetaMemoryTool20250818AllowedCallerDirect BetaMemoryTool20250818AllowedCaller = "direct"`

            - `const BetaMemoryTool20250818AllowedCallerCodeExecution20250825 BetaMemoryTool20250818AllowedCaller = "code_execution_20250825"`

            - `const BetaMemoryTool20250818AllowedCallerCodeExecution20260120 BetaMemoryTool20250818AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolComputerUse20250124 struct{…}`

          - `DisplayHeightPx int64`

            The height of the display in pixels.

          - `DisplayWidthPx int64`

            The width of the display in pixels.

          - `Name Computer`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const ComputerComputer Computer = "computer"`

          - `Type Computer20250124`

            - `const Computer20250124Computer20250124 Computer20250124 = "computer_20250124"`

          - `AllowedCallers []string`

            - `const BetaToolComputerUse20250124AllowedCallerDirect BetaToolComputerUse20250124AllowedCaller = "direct"`

            - `const BetaToolComputerUse20250124AllowedCallerCodeExecution20250825 BetaToolComputerUse20250124AllowedCaller = "code_execution_20250825"`

            - `const BetaToolComputerUse20250124AllowedCallerCodeExecution20260120 BetaToolComputerUse20250124AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `DisplayNumber int64`

            The X11 display number (e.g. 0, 1) for the display.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolTextEditor20241022 struct{…}`

          - `Name StrReplaceEditor`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const StrReplaceEditorStrReplaceEditor StrReplaceEditor = "str_replace_editor"`

          - `Type TextEditor20241022`

            - `const TextEditor20241022TextEditor20241022 TextEditor20241022 = "text_editor_20241022"`

          - `AllowedCallers []string`

            - `const BetaToolTextEditor20241022AllowedCallerDirect BetaToolTextEditor20241022AllowedCaller = "direct"`

            - `const BetaToolTextEditor20241022AllowedCallerCodeExecution20250825 BetaToolTextEditor20241022AllowedCaller = "code_execution_20250825"`

            - `const BetaToolTextEditor20241022AllowedCallerCodeExecution20260120 BetaToolTextEditor20241022AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolComputerUse20251124 struct{…}`

          - `DisplayHeightPx int64`

            The height of the display in pixels.

          - `DisplayWidthPx int64`

            The width of the display in pixels.

          - `Name Computer`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const ComputerComputer Computer = "computer"`

          - `Type Computer20251124`

            - `const Computer20251124Computer20251124 Computer20251124 = "computer_20251124"`

          - `AllowedCallers []string`

            - `const BetaToolComputerUse20251124AllowedCallerDirect BetaToolComputerUse20251124AllowedCaller = "direct"`

            - `const BetaToolComputerUse20251124AllowedCallerCodeExecution20250825 BetaToolComputerUse20251124AllowedCaller = "code_execution_20250825"`

            - `const BetaToolComputerUse20251124AllowedCallerCodeExecution20260120 BetaToolComputerUse20251124AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `DisplayNumber int64`

            The X11 display number (e.g. 0, 1) for the display.

          - `EnableZoom bool`

            Whether to enable an action to take a zoomed-in screenshot of the screen.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolTextEditor20250124 struct{…}`

          - `Name StrReplaceEditor`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const StrReplaceEditorStrReplaceEditor StrReplaceEditor = "str_replace_editor"`

          - `Type TextEditor20250124`

            - `const TextEditor20250124TextEditor20250124 TextEditor20250124 = "text_editor_20250124"`

          - `AllowedCallers []string`

            - `const BetaToolTextEditor20250124AllowedCallerDirect BetaToolTextEditor20250124AllowedCaller = "direct"`

            - `const BetaToolTextEditor20250124AllowedCallerCodeExecution20250825 BetaToolTextEditor20250124AllowedCaller = "code_execution_20250825"`

            - `const BetaToolTextEditor20250124AllowedCallerCodeExecution20260120 BetaToolTextEditor20250124AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolTextEditor20250429 struct{…}`

          - `Name StrReplaceBasedEditTool`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const StrReplaceBasedEditToolStrReplaceBasedEditTool StrReplaceBasedEditTool = "str_replace_based_edit_tool"`

          - `Type TextEditor20250429`

            - `const TextEditor20250429TextEditor20250429 TextEditor20250429 = "text_editor_20250429"`

          - `AllowedCallers []string`

            - `const BetaToolTextEditor20250429AllowedCallerDirect BetaToolTextEditor20250429AllowedCaller = "direct"`

            - `const BetaToolTextEditor20250429AllowedCallerCodeExecution20250825 BetaToolTextEditor20250429AllowedCaller = "code_execution_20250825"`

            - `const BetaToolTextEditor20250429AllowedCallerCodeExecution20260120 BetaToolTextEditor20250429AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `InputExamples []map[string, any]`

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolTextEditor20250728 struct{…}`

          - `Name StrReplaceBasedEditTool`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const StrReplaceBasedEditToolStrReplaceBasedEditTool StrReplaceBasedEditTool = "str_replace_based_edit_tool"`

          - `Type TextEditor20250728`

            - `const TextEditor20250728TextEditor20250728 TextEditor20250728 = "text_editor_20250728"`

          - `AllowedCallers []string`

            - `const BetaToolTextEditor20250728AllowedCallerDirect BetaToolTextEditor20250728AllowedCaller = "direct"`

            - `const BetaToolTextEditor20250728AllowedCallerCodeExecution20250825 BetaToolTextEditor20250728AllowedCaller = "code_execution_20250825"`

            - `const BetaToolTextEditor20250728AllowedCallerCodeExecution20260120 BetaToolTextEditor20250728AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `InputExamples []map[string, any]`

          - `MaxCharacters int64`

            Maximum number of characters to display when viewing a file. If not specified, defaults to displaying the full file.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaWebSearchTool20250305 struct{…}`

          - `Name WebSearch`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const WebSearchWebSearch WebSearch = "web_search"`

          - `Type WebSearch20250305`

            - `const WebSearch20250305WebSearch20250305 WebSearch20250305 = "web_search_20250305"`

          - `AllowedCallers []string`

            - `const BetaWebSearchTool20250305AllowedCallerDirect BetaWebSearchTool20250305AllowedCaller = "direct"`

            - `const BetaWebSearchTool20250305AllowedCallerCodeExecution20250825 BetaWebSearchTool20250305AllowedCaller = "code_execution_20250825"`

            - `const BetaWebSearchTool20250305AllowedCallerCodeExecution20260120 BetaWebSearchTool20250305AllowedCaller = "code_execution_20260120"`

          - `AllowedDomains []string`

            If provided, only these domains will be included in results. Cannot be used alongside `blocked_domains`.

          - `BlockedDomains []string`

            If provided, these domains will never appear in results. Cannot be used alongside `allowed_domains`.

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `MaxUses int64`

            Maximum number of times the tool can be used in the API request.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

          - `UserLocation BetaUserLocation`

            Parameters for the user's location. Used to provide more relevant search results.

            - `Type Approximate`

              - `const ApproximateApproximate Approximate = "approximate"`

            - `City string`

              The city of the user.

            - `Country string`

              The two letter [ISO country code](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2) of the user.

            - `Region string`

              The region of the user.

            - `Timezone string`

              The [IANA timezone](https://nodatime.org/TimeZones) of the user.

        - `type BetaWebFetchTool20250910 struct{…}`

          - `Name WebFetch`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const WebFetchWebFetch WebFetch = "web_fetch"`

          - `Type WebFetch20250910`

            - `const WebFetch20250910WebFetch20250910 WebFetch20250910 = "web_fetch_20250910"`

          - `AllowedCallers []string`

            - `const BetaWebFetchTool20250910AllowedCallerDirect BetaWebFetchTool20250910AllowedCaller = "direct"`

            - `const BetaWebFetchTool20250910AllowedCallerCodeExecution20250825 BetaWebFetchTool20250910AllowedCaller = "code_execution_20250825"`

            - `const BetaWebFetchTool20250910AllowedCallerCodeExecution20260120 BetaWebFetchTool20250910AllowedCaller = "code_execution_20260120"`

          - `AllowedDomains []string`

            List of domains to allow fetching from

          - `BlockedDomains []string`

            List of domains to block fetching from

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `Citations BetaCitationsConfigParamResp`

            Citations configuration for fetched documents. Citations are disabled by default.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `MaxContentTokens int64`

            Maximum number of tokens used by including web page text content in the context. The limit is approximate and does not apply to binary content such as PDFs.

          - `MaxUses int64`

            Maximum number of times the tool can be used in the API request.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaWebSearchTool20260209 struct{…}`

          - `Name WebSearch`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const WebSearchWebSearch WebSearch = "web_search"`

          - `Type WebSearch20260209`

            - `const WebSearch20260209WebSearch20260209 WebSearch20260209 = "web_search_20260209"`

          - `AllowedCallers []string`

            - `const BetaWebSearchTool20260209AllowedCallerDirect BetaWebSearchTool20260209AllowedCaller = "direct"`

            - `const BetaWebSearchTool20260209AllowedCallerCodeExecution20250825 BetaWebSearchTool20260209AllowedCaller = "code_execution_20250825"`

            - `const BetaWebSearchTool20260209AllowedCallerCodeExecution20260120 BetaWebSearchTool20260209AllowedCaller = "code_execution_20260120"`

          - `AllowedDomains []string`

            If provided, only these domains will be included in results. Cannot be used alongside `blocked_domains`.

          - `BlockedDomains []string`

            If provided, these domains will never appear in results. Cannot be used alongside `allowed_domains`.

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `MaxUses int64`

            Maximum number of times the tool can be used in the API request.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

          - `UserLocation BetaUserLocation`

            Parameters for the user's location. Used to provide more relevant search results.

        - `type BetaWebFetchTool20260209 struct{…}`

          - `Name WebFetch`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const WebFetchWebFetch WebFetch = "web_fetch"`

          - `Type WebFetch20260209`

            - `const WebFetch20260209WebFetch20260209 WebFetch20260209 = "web_fetch_20260209"`

          - `AllowedCallers []string`

            - `const BetaWebFetchTool20260209AllowedCallerDirect BetaWebFetchTool20260209AllowedCaller = "direct"`

            - `const BetaWebFetchTool20260209AllowedCallerCodeExecution20250825 BetaWebFetchTool20260209AllowedCaller = "code_execution_20250825"`

            - `const BetaWebFetchTool20260209AllowedCallerCodeExecution20260120 BetaWebFetchTool20260209AllowedCaller = "code_execution_20260120"`

          - `AllowedDomains []string`

            List of domains to allow fetching from

          - `BlockedDomains []string`

            List of domains to block fetching from

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `Citations BetaCitationsConfigParamResp`

            Citations configuration for fetched documents. Citations are disabled by default.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `MaxContentTokens int64`

            Maximum number of tokens used by including web page text content in the context. The limit is approximate and does not apply to binary content such as PDFs.

          - `MaxUses int64`

            Maximum number of times the tool can be used in the API request.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaWebFetchTool20260309 struct{…}`

          Web fetch tool with use_cache parameter for bypassing cached content.

          - `Name WebFetch`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const WebFetchWebFetch WebFetch = "web_fetch"`

          - `Type WebFetch20260309`

            - `const WebFetch20260309WebFetch20260309 WebFetch20260309 = "web_fetch_20260309"`

          - `AllowedCallers []string`

            - `const BetaWebFetchTool20260309AllowedCallerDirect BetaWebFetchTool20260309AllowedCaller = "direct"`

            - `const BetaWebFetchTool20260309AllowedCallerCodeExecution20250825 BetaWebFetchTool20260309AllowedCaller = "code_execution_20250825"`

            - `const BetaWebFetchTool20260309AllowedCallerCodeExecution20260120 BetaWebFetchTool20260309AllowedCaller = "code_execution_20260120"`

          - `AllowedDomains []string`

            List of domains to allow fetching from

          - `BlockedDomains []string`

            List of domains to block fetching from

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `Citations BetaCitationsConfigParamResp`

            Citations configuration for fetched documents. Citations are disabled by default.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `MaxContentTokens int64`

            Maximum number of tokens used by including web page text content in the context. The limit is approximate and does not apply to binary content such as PDFs.

          - `MaxUses int64`

            Maximum number of times the tool can be used in the API request.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

          - `UseCache bool`

            Whether to use cached content. Set to false to bypass the cache and fetch fresh content. Only set to false when the user explicitly requests fresh content or when fetching rapidly-changing sources.

        - `type BetaAdvisorTool20260301 struct{…}`

          - `Model Model`

            The model that will complete your prompt.

            See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.

          - `Name Advisor`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const AdvisorAdvisor Advisor = "advisor"`

          - `Type Advisor20260301`

            - `const Advisor20260301Advisor20260301 Advisor20260301 = "advisor_20260301"`

          - `AllowedCallers []string`

            - `const BetaAdvisorTool20260301AllowedCallerDirect BetaAdvisorTool20260301AllowedCaller = "direct"`

            - `const BetaAdvisorTool20260301AllowedCallerCodeExecution20250825 BetaAdvisorTool20260301AllowedCaller = "code_execution_20250825"`

            - `const BetaAdvisorTool20260301AllowedCallerCodeExecution20260120 BetaAdvisorTool20260301AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `Caching BetaCacheControlEphemeral`

            Caching for the advisor's own prompt. When set, each advisor call writes a cache entry at the given TTL so subsequent calls in the same conversation read the stable prefix. When omitted, the advisor prompt is not cached.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `MaxTokens int64`

            Bounds the advisor's total output (thinking + text) per call. When the advisor hits this cap, the returned advisor_result or advisor_redacted_result block carries stop_reason='max_tokens', and a truncation note is appended to the advice text the worker model sees (inside the encrypted blob in redacted mode). When set, the server also emits a remaining-tokens budget block in the advisor's prompt so the advisor self-shapes toward the cap. When omitted, the advisor model's default output cap applies and no budget block is emitted.

          - `MaxUses int64`

            Maximum number of times the tool can be used in the API request.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolSearchToolBm25_20251119 struct{…}`

          - `Name ToolSearchToolBm25`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const ToolSearchToolBm25ToolSearchToolBm25 ToolSearchToolBm25 = "tool_search_tool_bm25"`

          - `Type BetaToolSearchToolBm25_20251119Type`

            - `const BetaToolSearchToolBm25_20251119TypeToolSearchToolBm25_20251119 BetaToolSearchToolBm25_20251119Type = "tool_search_tool_bm25_20251119"`

            - `const BetaToolSearchToolBm25_20251119TypeToolSearchToolBm25 BetaToolSearchToolBm25_20251119Type = "tool_search_tool_bm25"`

          - `AllowedCallers []string`

            - `const BetaToolSearchToolBm25_20251119AllowedCallerDirect BetaToolSearchToolBm25_20251119AllowedCaller = "direct"`

            - `const BetaToolSearchToolBm25_20251119AllowedCallerCodeExecution20250825 BetaToolSearchToolBm25_20251119AllowedCaller = "code_execution_20250825"`

            - `const BetaToolSearchToolBm25_20251119AllowedCallerCodeExecution20260120 BetaToolSearchToolBm25_20251119AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaToolSearchToolRegex20251119 struct{…}`

          - `Name ToolSearchToolRegex`

            Name of the tool.

            This is how the tool will be called by the model and in `tool_use` blocks.

            - `const ToolSearchToolRegexToolSearchToolRegex ToolSearchToolRegex = "tool_search_tool_regex"`

          - `Type BetaToolSearchToolRegex20251119Type`

            - `const BetaToolSearchToolRegex20251119TypeToolSearchToolRegex20251119 BetaToolSearchToolRegex20251119Type = "tool_search_tool_regex_20251119"`

            - `const BetaToolSearchToolRegex20251119TypeToolSearchToolRegex BetaToolSearchToolRegex20251119Type = "tool_search_tool_regex"`

          - `AllowedCallers []string`

            - `const BetaToolSearchToolRegex20251119AllowedCallerDirect BetaToolSearchToolRegex20251119AllowedCaller = "direct"`

            - `const BetaToolSearchToolRegex20251119AllowedCallerCodeExecution20250825 BetaToolSearchToolRegex20251119AllowedCaller = "code_execution_20250825"`

            - `const BetaToolSearchToolRegex20251119AllowedCallerCodeExecution20260120 BetaToolSearchToolRegex20251119AllowedCaller = "code_execution_20260120"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `DeferLoading bool`

            If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

          - `Strict bool`

            When true, guarantees schema validation on tool names and inputs

        - `type BetaMCPToolset struct{…}`

          Configuration for a group of tools from an MCP server.

          Allows configuring enabled status and defer_loading for all tools
          from an MCP server, with optional per-tool overrides.

          - `MCPServerName string`

            Name of the MCP server to configure tools for

          - `Type MCPToolset`

            - `const MCPToolsetMCPToolset MCPToolset = "mcp_toolset"`

          - `CacheControl BetaCacheControlEphemeral`

            Create a cache control breakpoint at this content block.

          - `Configs map[string, BetaMCPToolConfig]`

            Configuration overrides for specific tools, keyed by tool name

            - `DeferLoading bool`

            - `Enabled bool`

          - `DefaultConfig BetaMCPToolDefaultConfig`

            Default configuration applied to all tools from this server

            - `DeferLoading bool`

            - `Enabled bool`

      - `TopK int64`

        Only sample from the top K options for each subsequent token.

        Used to remove "long tail" low probability responses. [Learn more technical details here](https://towardsdatascience.com/how-to-sample-from-language-models-682bceb97277).

        Recommended for advanced use cases only.

      - `TopP float64`

        Use nucleus sampling.

        In nucleus sampling, we compute the cumulative distribution over all the options for each subsequent token in decreasing probability order and cut it off once it reaches a particular probability specified by `top_p`.

        Recommended for advanced use cases only.

      - `UserProfileID string`

        The user profile ID to attribute this request to. Use when acting on behalf of a party other than your organization.

  - `Betas param.Field[[]AnthropicBeta]`

    Header param: Optional header to specify the beta version(s) you want to use.

    - `string`

    - `type AnthropicBeta string`

      - `const AnthropicBetaMessageBatches2024_09_24 AnthropicBeta = "message-batches-2024-09-24"`

      - `const AnthropicBetaPromptCaching2024_07_31 AnthropicBeta = "prompt-caching-2024-07-31"`

      - `const AnthropicBetaComputerUse2024_10_22 AnthropicBeta = "computer-use-2024-10-22"`

      - `const AnthropicBetaComputerUse2025_01_24 AnthropicBeta = "computer-use-2025-01-24"`

      - `const AnthropicBetaPDFs2024_09_25 AnthropicBeta = "pdfs-2024-09-25"`

      - `const AnthropicBetaTokenCounting2024_11_01 AnthropicBeta = "token-counting-2024-11-01"`

      - `const AnthropicBetaTokenEfficientTools2025_02_19 AnthropicBeta = "token-efficient-tools-2025-02-19"`

      - `const AnthropicBetaOutput128k2025_02_19 AnthropicBeta = "output-128k-2025-02-19"`

      - `const AnthropicBetaFilesAPI2025_04_14 AnthropicBeta = "files-api-2025-04-14"`

      - `const AnthropicBetaMCPClient2025_04_04 AnthropicBeta = "mcp-client-2025-04-04"`

      - `const AnthropicBetaMCPClient2025_11_20 AnthropicBeta = "mcp-client-2025-11-20"`

      - `const AnthropicBetaDevFullThinking2025_05_14 AnthropicBeta = "dev-full-thinking-2025-05-14"`

      - `const AnthropicBetaInterleavedThinking2025_05_14 AnthropicBeta = "interleaved-thinking-2025-05-14"`

      - `const AnthropicBetaCodeExecution2025_05_22 AnthropicBeta = "code-execution-2025-05-22"`

      - `const AnthropicBetaExtendedCacheTTL2025_04_11 AnthropicBeta = "extended-cache-ttl-2025-04-11"`

      - `const AnthropicBetaContext1m2025_08_07 AnthropicBeta = "context-1m-2025-08-07"`

      - `const AnthropicBetaContextManagement2025_06_27 AnthropicBeta = "context-management-2025-06-27"`

      - `const AnthropicBetaModelContextWindowExceeded2025_08_26 AnthropicBeta = "model-context-window-exceeded-2025-08-26"`

      - `const AnthropicBetaSkills2025_10_02 AnthropicBeta = "skills-2025-10-02"`

      - `const AnthropicBetaFastMode2026_02_01 AnthropicBeta = "fast-mode-2026-02-01"`

      - `const AnthropicBetaOutput300k2026_03_24 AnthropicBeta = "output-300k-2026-03-24"`

      - `const AnthropicBetaUserProfiles2026_03_24 AnthropicBeta = "user-profiles-2026-03-24"`

      - `const AnthropicBetaAdvisorTool2026_03_01 AnthropicBeta = "advisor-tool-2026-03-01"`

      - `const AnthropicBetaManagedAgents2026_04_01 AnthropicBeta = "managed-agents-2026-04-01"`

      - `const AnthropicBetaCacheDiagnosis2026_04_07 AnthropicBeta = "cache-diagnosis-2026-04-07"`

      - `const AnthropicBetaThinkingTokenCount2026_05_13 AnthropicBeta = "thinking-token-count-2026-05-13"`

      - `const AnthropicBetaServerSideFallback2026_06_01 AnthropicBeta = "server-side-fallback-2026-06-01"`

      - `const AnthropicBetaFallbackCredit2026_06_01 AnthropicBeta = "fallback-credit-2026-06-01"`

### Returns

- `type BetaMessageBatch struct{…}`

  - `ID string`

    Unique object identifier.

    The format and length of IDs may change over time.

  - `ArchivedAt Time`

    RFC 3339 datetime string representing the time at which the Message Batch was archived and its results became unavailable.

  - `CancelInitiatedAt Time`

    RFC 3339 datetime string representing the time at which cancellation was initiated for the Message Batch. Specified only if cancellation was initiated.

  - `CreatedAt Time`

    RFC 3339 datetime string representing the time at which the Message Batch was created.

  - `EndedAt Time`

    RFC 3339 datetime string representing the time at which processing for the Message Batch ended. Specified only once processing ends.

    Processing ends when every request in a Message Batch has either succeeded, errored, canceled, or expired.

  - `ExpiresAt Time`

    RFC 3339 datetime string representing the time at which the Message Batch will expire and end processing, which is 24 hours after creation.

  - `ProcessingStatus BetaMessageBatchProcessingStatus`

    Processing status of the Message Batch.

    - `const BetaMessageBatchProcessingStatusInProgress BetaMessageBatchProcessingStatus = "in_progress"`

    - `const BetaMessageBatchProcessingStatusCanceling BetaMessageBatchProcessingStatus = "canceling"`

    - `const BetaMessageBatchProcessingStatusEnded BetaMessageBatchProcessingStatus = "ended"`

  - `RequestCounts BetaMessageBatchRequestCounts`

    Tallies requests within the Message Batch, categorized by their status.

    Requests start as `processing` and move to one of the other statuses only once processing of the entire batch ends. The sum of all values always matches the total number of requests in the batch.

    - `Canceled int64`

      Number of requests in the Message Batch that have been canceled.

      This is zero until processing of the entire Message Batch has ended.

    - `Errored int64`

      Number of requests in the Message Batch that encountered an error.

      This is zero until processing of the entire Message Batch has ended.

    - `Expired int64`

      Number of requests in the Message Batch that have expired.

      This is zero until processing of the entire Message Batch has ended.

    - `Processing int64`

      Number of requests in the Message Batch that are processing.

    - `Succeeded int64`

      Number of requests in the Message Batch that have completed successfully.

      This is zero until processing of the entire Message Batch has ended.

  - `ResultsURL string`

    URL to a `.jsonl` file containing the results of the Message Batch requests. Specified only once processing ends.

    Results in the file are not guaranteed to be in the same order as requests. Use the `custom_id` field to match results to requests.

  - `Type MessageBatch`

    Object type.

    For Message Batches, this is always `"message_batch"`.

    - `const MessageBatchMessageBatch MessageBatch = "message_batch"`

### Example

```go
package main

import (
  "context"
  "fmt"

  "github.com/anthropics/anthropic-sdk-go"
  "github.com/anthropics/anthropic-sdk-go/option"
)

func main() {
  client := anthropic.NewClient(
    option.WithAPIKey("my-anthropic-api-key"),
  )
  betaMessageBatch, err := client.Beta.Messages.Batches.New(context.TODO(), anthropic.BetaMessageBatchNewParams{
    Requests: []anthropic.BetaMessageBatchNewParamsRequest{anthropic.BetaMessageBatchNewParamsRequest{
      CustomID: "my-custom-id-1",
      Params: anthropic.BetaMessageBatchNewParamsRequestParams{
        MaxTokens: 1024,
        Messages: []anthropic.BetaMessageParam{anthropic.BetaMessageParam{
          Content: []anthropic.BetaContentBlockParamUnion{anthropic.BetaContentBlockParamUnion{
            OfText: &anthropic.BetaTextBlockParam{
              Text: "x",
            },
          }},
          Role: anthropic.BetaMessageParamRoleUser,
        }},
        Model: anthropic.ModelClaudeOpus4_6,
      },
    }},
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", betaMessageBatch.ID)
}
```

#### Response

```json
{
  "id": "msgbatch_013Zva2CMHLNnXjNJJKqJ2EF",
  "archived_at": "2024-08-20T18:37:24.100435Z",
  "cancel_initiated_at": "2024-08-20T18:37:24.100435Z",
  "created_at": "2024-08-20T18:37:24.100435Z",
  "ended_at": "2024-08-20T18:37:24.100435Z",
  "expires_at": "2024-08-20T18:37:24.100435Z",
  "processing_status": "in_progress",
  "request_counts": {
    "canceled": 10,
    "errored": 30,
    "expired": 10,
    "processing": 100,
    "succeeded": 50
  },
  "results_url": "https://api.anthropic.com/v1/messages/batches/msgbatch_013Zva2CMHLNnXjNJJKqJ2EF/results",
  "type": "message_batch"
}
```
