Cohere Rerank 4 (Pro / Fast)
Reranker (scores query-document relevance). Previous: rerank-v3.5 (Bedrock cohere.rerank-v3-5:0). Release date from third-party listing; pricing not verified (OpenRouter ~$0.0025/search reported, not checked).
- Context window
- 32,000 tokens
- Input
- text
- Output
- text
- License
- proprietary
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| Cohere API | rerank-v4.0-pro | https://api.cohere.com/v2/rerank | docs |
| Cohere API (fast) | rerank-v4.0-fast | https://api.cohere.com/v2/rerank | — |
| OpenRouter | cohere/rerank-4-pro | openrouter.ai/cohere/rerank-4-pro | — |
Notable capabilities (2)
- 32K-context reranking: Rerank window grew from 4K (v3.5) to 32K tokens, so whole long documents can be scored. source
- Pro / Fast tiers: Two variants: pro for best accuracy, fast for latency-sensitive search. source
Second-stage reranking for RAG and enterprise search.
curl https://api.cohere.com/v2/rerank -H "Authorization: Bearer $CO_API_KEY" -H "Content-Type: application/json" \
-d '{"model":"rerank-v4.0-pro","query":"capital of France","documents":["Paris is the capital of France.","Berlin is in Germany."]}'
Sources: https://docs.cohere.com/docs/models
Other Cohere models
Command A+ · Cohere Embed v4 · Command A (03-2025) and variants