Build a Hybrid RAG System with FAISS, BM25, LangGraph and Claude Sonnet Model (opens in new tab)

Last Updated on June 22, 2026 by Editorial Team Author(s): Alpha Iterations Originally published on Towards AI. Build a Hybrid RAG System with FAISS, BM25, LangGraph and Claude Sonnet Model Combine semantic search and keyword search into one powerful document Q&A app using Claude Sonnet 4.6 API, step by step tutorial Hybrid Retrieval (Image by Alpha Iterations, Created using ChatGPT) Non members read here for free. Introduction With the rapid advancement of Large Language Models and vector em...