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...
In / out price$1.25/$10.00per 1M tokens
Context
400K tokens
Parameters
Undisclosed
Modalities
→
Released
Dec 4, 2025
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