Bi-encoder recall then cross-encoder precision — Cohere Rerank 3.5 vs bge-reranker trade-offs.
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Reranking in RAG: when and how to add a cross-encoder?
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rerankcross-encoder
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Retrieve 40 with fast bi-encoders, then rerank to 6 with a cross-encoder. It is the cheapest +10-15% nDCG win for RAG.
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