But I have $18 left on the limit.
I created a fresh API key, but still get the same error
How long since you added credit? Sometimes there's a delay.
It sounds like you'll need to raise a ticket with OpenAI. LINQPad uses the standard Chat API:https://platform.openai.com/docs/api-reference/chat
Let me know if you need any technical details.
Duplicate problem report see
This thread should be considered closed.