Hey, thanks for the report. This is a known bug and it’s already being tracked.
When you override the OpenAI base URL or use a custom API key, it’s incorrectly applied to all models (including subscription models like Grok and Composer), which causes the errors you’re seeing.
Workaround: toggle off your custom OpenAI API key/URL when using Grok, Composer, Claude, or Gemini. You can quickly switch it with Cmd+Shift+0 (or Ctrl+Shift+0 on Windows).
Related discussion with more details: Custom API key breaks other models
Let me know if the workaround helps!