Hey, thanks for the detailed report. You’re totally right, and this is an issue we’re already tracking.
One small detail about what you’re seeing. The default is applied correctly when the agent starts. But after the first reply, the follow-up composer can switch the selection to the Fast option, and any messages you send while Fast is shown will actually run and be billed as cursor-grok-4.6-high-fast. That’s why you’re seeing Fast lines in your usage, it’s not just a label.
Until the fix ships, the most reliable workaround is to check which model is selected in the follow-up field before sending. If it flipped, switch it back to Cursor Grok 4.6 High with Fast off.
Related threads on the same issue if you want to follow along:
- Fast mode is selected by deafult or switched on request (cloud agents)
- Agent model resets to Grok 4.6 High Fast on every sent message
If you want us to look into the Fast usage charges on your account specifically, email [email protected]. A separate team handles that.
I can’t share a timeline for the fix yet, but I’ll post here once there’s an update.