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GPT 5.1 Codex Max Timeline - Announcements & Release History | AI Stats

GPT 5.1 Codex Max

GPT 5.1 Codex Max

GPT 5.1 Codex Max

OpenAI

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Model Timeline

18 Dec 2025

Future version

19 Nov 2025

Model Released

Model first made available to the public

19 Nov 2025

Model Announced

Model first introduced to the public

13 Nov 2025

Previous version