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Cohere · Rerank model

Rerank 5 Fast

cohere/rerank-5-fast
  • Rerank
Released Nov 3, 2026

Rerank 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...

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-5-fast","query":"best espresso machine","documents":["brass lever espresso machine","a bicycle","coffee grinder"],"top_n":2}'