Hey, thanks for the report.
It looks like you’ve hit a known bug with the “Override OpenAI Base URL” toggle, which breaks Anthropic requests and returns “Bad User API key / Unauthorized.” Confirmation and workaround here:
- API Keys for ChatGPT and Anthropic Failing
- Anthropic models break when Override OpenAI BaseUrl is set
What to try now:
- Settings → Models → API Keys → turn off Override OpenAI Base URL
- Make sure it didn’t turn itself back on after a request
- Restart Cursor, open a new chat, select a Claude model, and try again
If the issue remains, please send:
- The Request ID from the chat menu at the time of the error
- A screenshot of Settings → Models → API Keys with the toggles visible
- The exact error text and a screenshot
- Console logs from Help → Toggle Developer Tools → Console
- Confirmation that Override OpenAI Base URL is definitely off
I’ll add your details to the ongoing fix. Let me know if the workaround helps.