AI Model Watch
Models / Cohere

Rerank 4 Fast (rerank-v4.0-fast)

GA

Rerank 4 Fast — AI search foundation model for relevance in search/RAG. 32,768 context window, multilingual across 100+ languages, no data pre-processing required, high performance / lowest latency. Price $2.00 per 1,000 search units read first-party from the "Rerank 4 Fast" card on cohere.com/pricing (Sanity payload: inputPrice 2, label "Cost", overridePer "1K searches"), 2026-07-26. A search unit is one query with up to 100 documents. Cohere also publishes a Model Vault dedicated-instance rate: Medium $5.00/hr ($3,250/mo). Knowledge cutoff/release date not published.

Rerank 4 Fast (rerank-v4.0-fast) by Cohere is tracked live in our LLM catalog, with a 32K (32.000-token) context window. It is generally available (GA).

Last verified: 13 Nov 2026 · sourced from official provider documentation

Provider
Cohere
Status
GA
Input price
—
Output price
—
Cached input
—
Blended price
—
Context window
32.000 tokens (32K)
Max output
—
Search price
$2 / 1,000 search units
Modality
text
Open weights
No — API only
Knowledge cutoff
—
Released
—
API string
rerank-v4.0-fast

Source: Cohere official documentation ↗

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FAQ

Rerank 4 Fast (rerank-v4.0-fast) — questions & answers

What is the context window of Rerank 4 Fast (rerank-v4.0-fast)?

Rerank 4 Fast (rerank-v4.0-fast) has a 32.000-token context window (32K).

Is Rerank 4 Fast (rerank-v4.0-fast) deprecated?

No — Rerank 4 Fast (rerank-v4.0-fast) is generally available (GA) and not currently scheduled for deprecation or retirement in our tracker.

Does Rerank 4 Fast (rerank-v4.0-fast) support image or vision input?

Our catalog lists Rerank 4 Fast (rerank-v4.0-fast)'s modalities as text; image/vision input is not among them.

Can I self-host Rerank 4 Fast (rerank-v4.0-fast)?

No — Rerank 4 Fast (rerank-v4.0-fast) is proprietary. Its weights are not publicly released, so it is available only through Cohere's API (or hosted partners), not for self-hosting.

What is the API model string for Rerank 4 Fast (rerank-v4.0-fast)?

The API model identifier for Rerank 4 Fast (rerank-v4.0-fast) is "rerank-v4.0-fast" when calling Cohere's API.