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

GPT 5.1 Codex

GPT 5.1 Codex

GPT 5.1 Codex

OpenAI

Overview Timeline Benchmarks Providers Quickstart Performance

Model Timeline

19 Nov 2025

GPT 5.1 Codex Max

Future version

13 Nov 2025

Model Released

Model first made available to the public

13 Nov 2025

Model Announced

Model first introduced to the public

15 Sept 2025

Previous version