ChatGPT — March 11, 2026

March 11, 2026

v2026-03-11-7f09ebb0 includes 2 changes. Retiring GPT-5.1 models

Source: official ChatGPT & Codex release notes. Summaries are written from the official notes; see how we work.

Changed

Retiring GPT-5.1 models
As of March 11, 2026, GPT-5.1 models are no longer available in ChatGPT. This applies to GPT-5.1 Instant, GPT-5.1 Thinking, and GPT-5.1 Pro. Existing conversations that used GPT-5.1 will automatically continue on the corresponding current model: GPT-5.3 Instant, GPT-5.4 Thinking, or GPT-5.4 Pro.

Get notified the minute the next ChatGPT & Codex release ships

AI Drops sends a push with a plain-English summary of every release.