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Mini toolsRerank 4
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Overview
ReRank 4 is Cohere's latest cross-encoder reranking model for enterprise search and RAG, with 32K token context, Fast and Pro tiers, and self-learning to adapt relevance while reordering retrieved documents by semantic similarity.
Description
ReRank 4 is Cohere's most powerful reranker, a cross-encoder search model that reads queries and candidate passages together and scores their semantic relevance. It adds a 32K token context window, Fast and Pro variants, and support for 100+ languages. Designed for RAG and agentic systems, it reorders retrieved documents and introduces a self-learning mode that adjusts rankings to each domain without labeled training data.
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Last updated: December 12, 2025
