---
title: GPT-4o
description: GPT-4o by OpenAI — multimodal flagship with vision, tool use, and structured output.
---

# GPT-4o

**Key:** `gpt-4o`  
**Provider:** [OpenAI](/en/providers/openai/)  
**Support:** `runnable`

## Capabilities

chat · tools · vision · json_schema

## Specifications

| Field | Value |
|-------|-------|
| Context window | 128 000 tokens |
| Input modalities | text · image · document |
| Output modalities | text |

## When to use

A mature multimodal model with a strong track record for tool use and structured output. Use when you need vision + JSON schema output in workflows where GPT-5.x cost is not justified.

## Provider documentation

→ [OpenAI model comparison](https://platform.openai.com/docs/models/compare?model=gpt-4o)
