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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. Your use is subject to OpenAI's Terms & Privacy Policies.

File InputImplicit CachingReasoningTool UseVision (Image)Web Search
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import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5.1-codex-max',
  prompt: 'Why is the sky blue?'
})
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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
Context
Max Output
Latency
Throughput
Input
Output
Cache
Web Search
Capabilities
ZDR
No Training
Release Date
Azure
Legal:Terms•Privacy
400K128K
$1.25/M
$10/M
Read:$0.13/M
Write:—
$14/K
+ input costs
+3
11/19/2025