CohereRerank 5 Fast is the low-latency tier of Cohere's Rerank 5 family of reranking models. It scores and reorders candidate documents against a query and is suited for high-throughput retrieval such as high-volume search, agent tool loops, and first-pass filtering before a more expensive step. Relevance scores are calibrated to a 0-1 range so a fixed threshold behaves consistently across queries.
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