List models (OpenAI compatible)
The model names of the OpenAI-compatible route, as an OpenAI model list: the language model names, such as assemblyai-tts-en, of the languages a model of the region speaks. A language no model of the region speaks is not listed, and requests in it are refused. OpenAI clients read it at {base_url}/models. It does not check a credential, so a successful read does not mean that a key is valid.
It is public: no credential is needed, and a credential that is sent is not checked. HEAD answers with the same headers and no body. The answer may be cached for 5 minutes (Cache-Control: public, max-age=300).