← ChatGPT & Codex changelog

ChatGPT — March 19, 2026

v2026-03-19-d15e39a1 includes 2 changes. Legacy deep research mode deprecation notice

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

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.

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