Backend2026-05-17
FastAPI
Also known as: FastAPI / ファストAPI
A high-performance async Python API framework with automatic Pydantic validation, auto-generated OpenAPI docs, and asyncio support. Widely used for LLM API wrappers and RAG endpoints.
Overview
FastAPI is among the fastest Python API frameworks, using type annotations and Pydantic to automate validation and OpenAPI documentation. It is typically deployed with Uvicorn and Gunicorn in production.
AI Agent Integration
FastAPI supports streaming responses, WebSockets, and Server-Sent Events, making it ideal as a wrapper server for LLM inference APIs. See Claude Code Agent SDK guide for combined usage examples.
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