OpenRouter is a great step in that direction: https://openrouter.ai/

It looks very similar if not identical to OpenAI?

check out LiteLLM... been using in (lite) production and they make it easy to switch between models with a standardized API.

Langchain, for all its popularity, is some of the worst, most brittle Python code I’ve ever seen or tried to use, so I’d prefer to have things sorted out for me at the API level.

Imo it's unfortunate that python is the dominant tech of this domain. Typescript is better suited for the inference side of things (I know there a ts version of most things, most most companies are looking for python dev)

Python is fine. The problem is all the folk writing Python as if they were doing Java cosplay and without any tests or type annotations.

I switched to using Instructor/Marvin which works really nicely with native pydantic models and gets out the way for everything else.