> ## Documentation Index
> Fetch the complete documentation index at: https://mixroute.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Rerank v4.0 Pro
> Cohere quality-focused multilingual relevance ranking model.
Cohere quality-focused multilingual relevance ranking model.
## Model Information
| Field | Description |
| - | - |
| `model` | rerank-v4.0-pro |
| `context` | 32,768 tokens |
| `endpoint` | POST /v1/rerank |
Context and output sizes describe the model specification. Effective request limits, availability, and billing depend on the MixRoute route.
## Capabilities and Usage
* Reranks supplied documents against a query; it does not generate answers or embeddings.
* The context limit applies to a query/document pair. Retrieve candidates first, then use top\_n to select the most relevant results.
* results\[].index maps back to the original documents array. Use that index instead of assuming document text is returned.
## Request Example
Set `MIXROUTE_API_KEY` before making the request.
```bash theme={null}
curl --request POST "https://api.mixroute.ai/v1/rerank" \
--header "Authorization: Bearer $MIXROUTE_API_KEY" \
--header "Content-Type: application/json" \
--data '{
"model": "rerank-v4.0-pro",
"query": "API documentation",
"documents": [
"An API reference for developers.",
"A recipe for soup."
],
"top_n": 1
}'
```
## Request Fields
| Field | Description |
| - | - |
| `model` | Required. Use the exact model ID above. |
| `query` | Required query text. |
| `documents` | Required array of document strings. |
| `top_n` | Optional number of results to return; no more than the number of candidates. |
Complete request format: [rerank](/docs/api-reference/endpoint/rerank).
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