Building a Chatbot API with FastAPI + OpenAI/Claude — Step by Step

Posted on Wed 30 September 2026 in Tutorial • Tagged with FastAPI, Python, chatbot, OpenAI, Claude, GenAI, LLM

Why This Matters

Every GenAI journey eventually hits the same milestone: building your first real chatbot API, not just calling a model from a script. This is the project that ties together everything else — API keys, request/response models, calling an LLM provider, and returning a clean response your frontend …


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