ChatGPT — February 20, 2026

February 20, 2026

v2026-02-20-cd00428b includes 2 changes. Expanded context window for Thinking

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

Changed

Expanded context window for Thinking
ChatGPT now has a total context window length of 256k tokens (128k input and 128k max output) when you manually select Thinking. Previously it was 196k total tokens.

Get notified the minute the next ChatGPT & Codex release ships

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