Cohere · Rerank model

Rerank 4 Pro

cohere/rerank-4-pro

Rerank

Released Apr 6, 2026

Cohere's AI search foundation model for enhancing the relevance of information surfaced within search and RAG systems. Features a 32K context window, multilingual support across 100+ languages, no data pre-processing...

Specifications

Input: one query and up to 1,000 documents
Output: relevance score per document, sorted; top_n to keep the best
Billing: per token across all query–document pairs

Use it

POST /api/v1/rerank · MCP rerank · full reference

curl https://omnirail.org/api/v1/rerank \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"cohere/rerank-4-pro","query":"best espresso machine","documents":["brass lever espresso machine","a bicycle","coffee grinder"],"top_n":2}'