Model · Cohere · Reranking

Cohere Rerank 5

Cohere's flagship reranker family (rerank-v5.0-pro, rerank-v5.0-fast). The standard second-pass model after a vector or BM25 retrieval — multilingual, 32K per-doc context, calibrated relevance scores, and optional Context Focus that returns the relevant passages inside each document.

Modality: Reranking
License: Proprietary (Proprietary)
Released: October 21, 2026
Last verified: October 28, 2026
Runs locally: No

Strengths

Drop-in second pass over keyword, vector or hybrid search — no re-indexing
Context Focus returns scored passages within each document in the same call
Calibrated relevance scores read as a probability, so a fixed cut-off is meaningful
Multilingual; Pro and Fast tiers; available on Microsoft Foundry and Amazon SageMaker

Weaknesses

Closed weights — self-hosting only through a private deployment arranged with Cohere
Reranking is always a second-pass tool; needs an embedding/BM25 first pass

Try it

Where	Type	Notes
Cohere API	hosted-api	API key required
AWS Bedrock	hosted-api	Enterprise; lists Rerank 3.5 only, not Rerank 5 (checked 2026-10-28)

Used in solutions

How-to Local-OK

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Official sources

Change log

Oct 28, 2026 — Updated from Rerank v4 to Rerank 5 (released 2026-10-21): rerank-v5.0-pro and rerank-v5.0-fast, 32K context, Context Focus and calibrated relevance scores; API price per Cohere's announcement $0.05 (Pro) / $0.02 (Fast) per 1M tokens. Cohere's models page now marks rerank-v4.0-pro/-fast as previous generation. Also corrected the Bedrock row: AWS's Cohere page lists only Rerank 3.5, so the earlier 'v4 on Bedrock' strength was dropped.
Sep 8, 2026 — Verified current against Cohere's models page and the Rerank v4.0 changelog. rerank-v4.0-pro is top of the rerank list; rerank-v4.0-fast is a sibling tier, not a successor.
Jun 8, 2026 — Updated from Rerank v3 to rerank-v4.0-pro (released 2025-12-11). (Interim: rerank-v3.5 2024-12-02.)
May 10, 2026 — Initial entry.