← ChatGPT & Codex changelog

ChatGPT — December 19, 2025

v2025-12-19-327a88f2 includes 1 new features and 0 fixes. New detailed characteristic controls

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

Added

  • New detailed characteristic controls

Changed

  • In addition to selecting a base style and tone preset—like candid and friendly—you can now adjust specific characteristics individually. From the ‘personalization’ pane in settings, you can adjust ChatGPT to:
  • Be more or less warm
  • Be more or less enthusiastic
  • Use more or fewer headers & lists
  • Use more or fewer emojis

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