One API and one bill for hundreds of models, with automatic fallback. Built by OpenRouter.
Others in infrastructure
Common questions
Is OpenRouter free to use?
OpenRouter is open source and free to run yourself. You still pay whichever model provider you point it at, and this tutorial is free with no signup.
Do I need to know Python to use OpenRouter?
Basic Python is enough. Functions, dictionaries and imports cover most of what OpenRouter asks of you.
When should I not use OpenRouter?
When something else in infrastructure fits the job better. The others in that group are listed below.
Lessons for OpenRouter are being written. Meanwhile the APIs for AI tutorial covers the same ground: state, tools, loops, memory and human approval. Most of it carries straight over.
Start the APIs for AI tutorial →