Retrieve the list of currently available models. The response format is automatically determined based on the request headers:
When the x-api-key and anthropic-version headers are present, the Anthropic format is returned
When the x-goog-api-key header or the key query parameter is present, the Gemini format is returned. Full Gemini path: /v1/models/{model_name}?key={your_token}
Otherwise, the OpenAI format is returned by default