Hybrid Search
Keyword search and vector search fused — lexical precision plus semantic recall.
Hybrid search runs lexical retrieval (BM25) and semantic retrieval (embeddings) in parallel and merges results, typically with reciprocal rank fusion. Each covers the other’s blind spot: keywords catch exact codes and names; vectors catch paraphrase and meaning. Most production RAG retrieval is hybrid, often followed by a reranker for final ordering.