OpenAI: GPT-5.1-Codex-Max
openai/gpt-5.1-codex-max
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...
Modalities
In / Out Price
$1.25 / $10 per 1M
Context
400K
Released
Dec 4, 2025
Knowledge Cutoff
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