Qwen3 Reranker

Qwen3 Reranker 0.6B is Qwen’s open-weights reranking model. It reads a query and a document and returns the probability that the document is relevant. Use it to reorder the results of a keyword or embedding search before you show them or pass them to a language model. Prime Inference serves it on Prime infrastructure as a hosted model.

	Qwen3 Reranker 0.6B on Prime Inference
Model ID	`qwen/qwen3-reranker-0.6b`
Input	Text
Output	A relevance probability per document
Context window	32,768 tokens per prompt, which holds the instruction, the query, one document and the prompt template
Endpoints	Rerank API and Classify API

The model scores each document in its own prompt, together with the query and an instruction. A request can rank up to 1,000 documents. See the model catalog or the Models API for current pricing and availability.

Use Prime Inference

The model doesn’t take Chat Completions requests. Create a Prime API key with Inference permission in the API keys guide, then call the Rerank API:

export PRIME_API_KEY="your-api-key"

curl https://api.pinference.ai/api/v1/rerank \
  -H "Authorization: Bearer $PRIME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen/qwen3-reranker-0.6b",
    "query": "How do I rotate an API key?",
    "documents": [
      "To rotate a key, create a new key, update your clients, then delete the old key.",
      "API keys can be scoped to a single team."
    ]
  }'

The response lists the documents most relevant first, each with its index in the request and a relevance_score from 0 to 1. To charge a team instead of your personal account, add -H "X-Prime-Team-ID: your-team-id". Keep API keys server-side.

Write an instruction

The model reads a one-line instruction with every document. The default, Given a web search query, retrieve relevant passages that answer the query, suits search. For a different task, set instruction in the same pattern, Given a <kind of query>, retrieve <kind of document> that <relation to the query>:

{
  "model": "qwen/qwen3-reranker-0.6b",
  "instruction": "Given a bug report, retrieve past issues that describe the same bug",
  "query": "Checkout returns a 500 error after the card is charged.",
  "documents": ["...", "..."]
}

To change the rest of the prompt as well, format the prompts yourself and send them to the Classify API.

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