---
title: FastRouter
---

<!-- THIS FILE IS AUTO-GENERATED BY website/scripts/generate-model-docs.js. DO NOT EDIT MANUALLY. -->

# FastRouter

Use `fastrouter/<model>` with VoltAgent's model router.

## Quick start

```ts
import { Agent } from "@voltagent/core";

const agent = new Agent({
  name: "fastrouter-agent",
  instructions: "You are a helpful assistant",
  model: "fastrouter/anthropic/claude-opus-4.1",
});
```

## Environment variables

- `FASTROUTER_API_KEY`

## Provider package

`@ai-sdk/openai-compatible`

This provider uses the OpenAI-compatible adapter.

## Default base URL

`https://go.fastrouter.ai/api/v1`

You can override the base URL by setting `FASTROUTER_BASE_URL`.

## Provider docs

- https://fastrouter.ai/models

## Models

<details>
  <summary>Show models (14)</summary>

- anthropic/claude-opus-4.1
- anthropic/claude-sonnet-4
- deepseek-ai/deepseek-r1-distill-llama-70b
- google/gemini-2.5-flash
- google/gemini-2.5-pro
- moonshotai/kimi-k2
- openai/gpt-4.1
- openai/gpt-5
- openai/gpt-5-mini
- openai/gpt-5-nano
- openai/gpt-oss-120b
- openai/gpt-oss-20b
- qwen/qwen3-coder
- x-ai/grok-4

</details>
