GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
Developer
OpenAI
Release Date
December 4, 2025
Context Window
400,000 tokens≈ 533 words
API Access
Publicly AvailableIntegrate via official API
Input Cost
$1.25per million tokens
Output Cost
$10.00per million tokens
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