GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Developer
OpenAI
Release Date
November 13, 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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