Hi, I’m using Zeabur AI Hub with a valid API key and positive balance.
Model:
grok-4-fast-non-reasoning
Endpoint tested:
https://hnd1.aihub.zeabur.ai/v1/chat/completions
https://sfo1.aihub.zeabur.ai/v1/chat/completions
Result:
HTTP 431
Response:
litellm.APIError: AzureException APIError - {"error":{"code":"Unknown Status Code","message":"","status":431}}
Received Model Group=grok-4-fast-non-reasoning
Available Model Group Fallbacks=None
Important facts:
- the model appears in /v1/models
- the request appears in Daily Usage Records
- the request consumes no tokens and costs $0
- other models (for example DeepSeek) work with the same API key
This looks like a backend routing / deployment problem for Grok on your side.
Please check the deployment and routing for grok-4-fast-non-reasoning.