GPT-5.1-Codex-Max · model releasegpt-5.1-codex-max

Valid from

2025-12-04

Valid until

still holds

Published

2025-12-04

Recorded by AsOf

2026-11-04

Checked

2026-11-04 · its source page states the value and the date

Confidence

0.95

Sources

“Dec 4 Feature gpt-5.1-codex-max v1/responses Released gpt-5.1-codex-max to the Responses API.”— what the page says, read 2026-11-04

• OpenAI API changelog, December 4, 2025primary · developers.openai.com · 2025-12-04

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