### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

LiteLLM version: v1.81.14 GPUStack version: v2.1.1 deloyed model: chandra-ocr-2

When test the connection, LiteLLM response 500 error.

I'm using OPENAI as provider and set API_URL as http://my_ip:my_port/v1 Here is the complete error: { "error": { "message": "litellm.AuthenticationError: AuthenticationError: OpenAIException - Invalid authentication credentials. Received Model Group=chandra-ocr-2\nAvailable Model Group Fallbacks=None", "type": null, "param": null, "code": "401" } }

I ensure that my GPUStack is work since I can send request to it directly. However, it doesn't work with LiteLLM

### Steps to Reproduce

Connect a GPUStack endpoint in Add Model tab

### Relevant log output

```shell

```

### What part of LiteLLM is this about?

Other

### What LiteLLM version are you on ?

v1.81.14

### Twitter / LinkedIn details

_No response_