OpenAI Releases GPT-5.1-Codex-Max
GPT-5.1-Codex-Max crushes million-token coding marathons, beats 2h 42min dev tasks in 50% time, 30% fewer tokens.
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Gemini 3 dominates the field, OpenAI can’t sit still.
Released a new version of Codex—GPT-5.1-Codex-Max, breaking through context window limitations to achieve continuous work spanning millions of tokens over extended periods, with the longest exceeding 24 hours.
The new model is also more task-efficient. Here’s the comparison between its solar system gravity sandbox and the previous generation GPT-5.1-Codex (with several additional “suns” added to observe gravitational effects):
Resource consumption looks like this:
