I see that after switching to the built-in model, a different error showed up.
The “invalid x-api-key” error is often related to the “Override OpenAI Base URL” setting. Can you check:
- Settings > Models > API Keys
- Make sure “Override OpenAI Base URL” is turned off
- If it was on, turn it off and restart Cursor
- Open a new chat and try again
If that doesn’t help, please send:
- A screenshot of Settings > Models > API Keys (with all toggles visible)
- Your current Cursor version (Help > About Cursor)
- Confirmation that Override OpenAI Base URL is definitely turned off
This is a known issue, I’ll add your case to the ticket for the dev team.