infrastructure-model-routing-litellm-proxy-versions-1-82-1-send-full-model-id-i-c8440b88

THEN Modify the `get_llm_provider()` function to only strip the 'openrouter/' prefix for native OpenRouter models (those with no additional slash after the prefix, e.g., 'openrouter/auto' or 'openrouter/free'). Specifically, after stripping 'openrouter/', check if the remainder contains a '/'; if so, preserve the full prefix. Alternatively, downgrade to LiteLLM 1.82.0 or configure the model as a custom OpenAI provider with API base https://openrouter.ai/api/v1.

def get_llm_provider(model):
    prefix = 'openrouter/'
    if model.startswith(prefix):
        rest = model[len(prefix):]
        if '/' not in rest:
            # native OpenRouter model, strip prefix
            return rest
    # else leave model unchanged
    return model