> Locally running, like, llama.cpp? Or Python?

I’d guess it supports a small set of popular HTTP APIs (particularly, its very common for self-hosting LLM toolkits—not the per-model reference implementations or low-level console frontends—to present an OpenAI compatible API), so you could support a very wide range of local models, through a variety of toolkits, just by supporting the OpenAI API with configurable endpoint addresses.