GPT 5.1 Codex Max
GPT 5.1 Codex Max applies maximum compute to the GPT-5.1 codex architecture, delivering the deepest reasoning and most thorough code analysis available in OpenAI's coding agent lineup for the most demanding software engineering tasks.
ReasoningFile InputTool UseVision (Image)Web SearchImplicit Caching
index.ts
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.1-codex-max', prompt: 'Why is the sky blue?'})Providers
Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.
| Provider |
|---|
 OpenAI | 400K | 3.3s | 51tps | $1.25/M | $10.00/M | Read:$0.13/M Write:— | $10.00/K + input costs | — | +4 | 11/19/2025 | ||
 Azure | 400K | 1.7s | $1.25/M | $10.00/M | Read:$0.13/M Write:— | $14/K + input costs | — | +4 | 11/19/2025 |