Reranking Models and Late-Interaction Frameworks in Production RAG: Comparing Cohere Rerank 3.5, BGE-Reranker-v2, FlashRank, and ColBERTv2 Architecture, Cross-Encoder Latency, MaxSim Compression, and Retrieval Economics
Reranking Models and Late-Interaction Frameworks in Production RAG: Comparing Cohere Rerank 3.5, BGE-Reranker-v2, FlashRank, and ColBERTv2 Architecture, Cross-Encoder Latency, MaxSim Compression, and Retrieval Economics In production Retrieval-Augmented Generation (RAG), relying solely on first-stage bi-encoder dense embeddings or lexical BM25 search creates a structural information bottleneck. First-stage retrieval compresses an entire document passage into a single fixed-dimensional vector (s
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