Cohere Rerank 5 is out: rerank-v5.0-pro and rerank-v5.0-fast (October 21, 2026)

What you get

On October 21, 2026 Cohere released Rerank 5 in two versions: rerank-v5.0-pro for the best quality and rerank-v5.0-fast for low latency. Cohere says the fast version beats Rerank 4 Pro.

Two things are new. Context Focus is an optional relevant_spans setting that returns the most relevant passages inside each document as scored character spans. Relevance scores are now calibrated, so one threshold works across different queries. Both models take 32k tokens of context and cover 100+ languages.

Rerank 4 models are still listed.

Prerequisites

A Cohere API key in CO_API_KEY
An app that already calls the Rerank API

Steps

Change model to rerank-v5.0-pro or rerank-v5.0-fast. No re-indexing is needed.
Leave Context Focus off (the default) unless you want passage spans back.
If you filter results by score, re-tune your cut-off on the new calibrated scores.

Test it

Run the same query against Rerank 4 and Rerank 5 and compare the top results and their scores.

Not confirmed

A retirement date for the Rerank 4 models.