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Building AI APIs with Python FastAPI

Learn how to build a REST API that talks to an AI model — the same core pattern behind almost every AI app out there (chatbots, coding assistants, content tools). You'll build a working FastAPI endpoint that takes user input, calls an LLM, and returns a real response — tested live using FastAPI's interactive docs page. By the end, you'll understand how AI apps are wired together under the hood, and have a reusable pattern you can extend with your own ideas (memory, tool use, auth, and more).