Resolved
The issue is now resolved. OpenAI APIs are working as expected. Overleaf AI features that use GPT models such as Error Assist, TeXGPT, or Writefull language are functional.
Investigating
We are currently experiencing issues with AI features that use GPT models such as Error Assist, TeXGPT, or Writefull language checking in a non-English language. Responses may be slower than normal due to a partial OpenAI outage.