v0.19.0

✨ Highlights

• API support for gpt-5.3-codex and added support for gpt-5.3-codex-spark
  • Note: at the time of this release Spark requires the ChatGPT Pro ($200/m) plan
• Analytics page (Cmd+Shift+Y) to provide a convenient look into spend and model performance
• "Auto" agent mode which delegates selection of exec/plan/ask/etc. mode to the agent
• Immersive Review (Shift+I), which provides an IDE-like, full-file review experience
  • We are actively fixing some performance issues with large files, consider this feature a preview of things to come
• Nightly release channel available when clicking the version number in the top left of Mux

Misc.

• Contains many improvements to the mobile experience
• Simplified the Chat Input controls, consolidating help indicators
• Added first-class support for creating creating skills in the Chat with Mux help workspace