### Check for existing issues

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

### What happened?

OpenAI compatible endpoint returned output is empty, but the call of the api is successfull. In the repsonse json the message is returned, however the output in "pretty" is empty. For that reason, claude code tested in versions v2.1.110, v2.1.92, v2.1.52 and littellm versions: v1.83.8, v1.83.3, v1.82.2 do not deliver the answer to "hi".

Here is the response from the server: ``` { "id": "resp_bGl0ZWxsbTpjdXN0b21fbGxtX3Byb3ZpZGVyOm9wZW5haTttb2RlbF9pZDoxNDc1NjNlNGZmNDRkNjkyMzliNGY4MDJkZGVhOWE3NDYzMzYzMzg2ZWQyNzI5ZWU5ZmU4NDYwMjAxN2JjNTFkO3Jlc3BvbnNlX2lkOnJlc3BfYmQ0OTg4NzRiNTJkZTg0Zg==", "text": null, "user": "user_a4e122d37d0f4540af7d7944c9ebb8a2ba530f6ae907ac7047429bd570c", "error": null, "model": "qwen3.5-397b-a17b", "store": null, "tools": [ { "name": "Task", "type": "function", "strict": null, "parameters": { "type": "object", "$schema": "https://json-schema.org/draft/2020-12/schema", "required": [ "description", "prompt", "subagent_type" …