ChatGPT — March 17, 2026

March 17, 2026

v2026-03-17-061904df includes 0 new features and 0 fixes. 14 changes

Changed

Updates to the model picker in ChatGPT
We’ve simplified the model picker to make it easier to choose the right level of reasoning. Users on Plus, Pro, Business, Enterprise, and Edu accounts will see a set of model options depending on their plan, including:
Instant – fast responses for everyday questions
Thinking – deeper reasoning for more complex tasks
Pro – the most advanced reasoning models
The Auto functionality can be accessed by clicking Configure in the model picker menu and choosing "Auto-switch to Thinking.” This setting will automatically be on if your last chat was set to Auto.
Configure more advanced settings
If you want more control, click Configure to:
Turn automatic switching between Instant and Thinking on or off
Access legacy models
Set thinking effort when Thinking or Pro is selected
We’ve also simplified the retry menu, making it easier to regenerate responses with Thinking or Pro models by clicking on the three dots underneath the response.
We’re sunsetting the preset Nerdy base style to simplify options and improve response quality. Users who selected it will be moved to the default personality. You can manage personality settings anytime in ChatGPT under Settings → Personalization.