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2026-03-22 / skill-finderHybrid Search + Reciprocal Rank Fusion + Cross-Encoder Reranking: The Three-Layer RAG Recall Stack with 20–42% Cumulative GainsProduction RAG systems now treat hybrid search as non-optional: running vector search (semantic) and BM25 (lexical) in parallel yields 20-40% recall improvement over either method alone, with Reciprocal Rank Fusion merging both ranked lists into a unified result. Adding a cross-encoder reranker as a third pass captures an additional 18-42% precision boost by scoring passage-query pairs jointly rather than independently. 80% of RAG failures trace to the retrieval layer rather than the LLM — this three-layer stack addresses the root cause.

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