← ChatGPT & Codex changelog
ChatGPT — March 19, 2026
v2026-03-19-d15e39a1 includes 0 new features and 0 fixes. 2 changes
Changed
- Legacy deep research mode deprecation notice
- The legacy deep research mode will be removed on Thursday, March 26, 2026. This change only affects the legacy mode; the current deep research experience will remain unchanged. Historical conversations and results will remain accessible. To learn more about deep research, see: Deep research in ChatGPT.