Rerank 4 Fast vs rerank-2.5: side-by-side summary

Rerank 4 Fast and rerank-2.5 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Rerank 4 Fast, from Cohere, has a 32,768-token context window and is priced at $0.002/search on OpenRouter.

rerank-2.5, from voyageai, has a 32,000-token context window and is priced at $0.05/M tokens on OpenRouter.

Context window

• Rerank 4 Fast: 32,768 tokens
• rerank-2.5: 32,000 tokens

Price

• Rerank 4 Fast: $0.002/search
• rerank-2.5: $0.05/M tokens

Provided by

• Rerank 4 Fast: Cohere
• rerank-2.5: voyageai

• Rerank 4 Fast model details, providers and pricing
• rerank-2.5 model details, providers and pricing