Hey, this isn’t a bug. In the latest versions, we updated the UI for the model picker. Instead of separate rows for each option (GPT-5.4, GPT-5.4 High, GPT-5.4 Extra High, etc.), there’s now one model, and you set the reasoning level separately.
To pick GPT-5.4 High:
- Select GPT-5.4 in the model picker
- Hover over the model name and click the edit button
- Switch reasoning to High
More details with a screenshot from our team: What happend to GTP-5.4-Extra-High non MAX
Let me know if you can’t see the edit button.