Alibaba

Qwen3 Reranker 8B

Name: Qwen3 Reranker 8B
Availability: InStock
Author: Alibaba

Qwen3 Reranker 8B is a reranking model from Alibaba's Qwen3 family, used to reorder candidate documents by relevance to a query in search and RAG pipelines.

Input from

$0.200 / 1M tokens

across 1 provider

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API Pricing

Provider	Input / 1M	Output / 1M	Updated	Source
Fireworks AI	$0.200	$0.0000	9/24/2026

Prices updated daily. Last check: Sep 25, 2026

Qwen3 Reranker 8B pricing by provider

Input, output, and batch rates, plus alternatives, for one provider at a time.

Fireworks AI1 provider comparedfrom $0.200/1M

Model Details

General

Creator: Alibaba
Modalities: Text

Capabilities

Tool Calling: No
Open Source: No
Aliases: Qwen/Qwen3-Reranker-8B

Strengths & Limitations

Strengths

Purpose-built cross-encoder style reranking, which scores query and document jointly rather than comparing independent embeddings
Part of the Qwen3 family, so it pairs naturally with Qwen3 Embedding models in a two-stage retrieval stack
8B parameter size sits at the larger end of the Qwen3 reranker line, aimed at relevance accuracy over minimum latency
Multilingual text handling makes it applicable to non-English and mixed-language corpora
Open-weight release means it can be self-hosted on your own GPUs instead of only accessed through a hosted API
Improves top-k precision in RAG pipelines without requiring changes to the underlying vector index
Reranking a shortlist is far cheaper per candidate than using a general-purpose LLM as a relevance judge

Limitations

Not a chat or generation model — it outputs relevance scores, not text, so it cannot answer questions on its own
Requires a first-stage retriever; it cannot search a corpus by itself because every candidate must be scored individually
At 8B parameters it is the more compute-intensive option in its series, adding latency compared with smaller rerankers
Scoring cost scales linearly with the number of candidates, so large shortlists become expensive quickly
Reranker hosting is less widely available across inference providers than mainstream chat models

Key Features

•Query-document relevance scoring for search and RAG reranking

•8B parameter reranker in the Qwen3 model family

•Multilingual text reranking

•Designed to pair with Qwen3 Embedding models in a retrieve-then-rerank pipeline

•Open weights available for self-hosted deployment

•Batch scoring of candidate documents against a single query

•Drop-in second-stage component for existing vector or keyword search stacks

About Qwen3 Reranker 8B

Qwen3 Reranker 8B is a text reranking model released by Alibaba as part of the Qwen3 model family. Unlike a chat model, it is not used to generate free-form responses. It takes a query and a candidate document (or a batch of candidates) and produces a relevance score, which is then used to reorder results retrieved by a first-stage system such as vector search or BM25. The 8B designation refers to its parameter count, placing it at the larger end of the Qwen3 reranker line, where smaller variants trade accuracy for lower latency and compute cost. As a reranker, Qwen3 Reranker 8B is designed to be paired with an embedding or keyword retriever rather than replacing it. Retrieval systems typically fetch a wide candidate set cheaply, then apply a reranker to a shortlist — commonly the top 20 to 100 documents — because scoring each query-document pair jointly is more expensive than comparing precomputed vectors. The Qwen3 reranker series is built for multilingual text and is commonly deployed alongside the Qwen3 Embedding models, which share the same lineage and training approach. In practice, Qwen3 Reranker 8B is used to raise the precision of the top few results that get passed into an LLM's context window in retrieval-augmented generation, or that get shown to a user in a search interface. Compared with smaller rerankers, the 8B size generally offers better relevance discrimination at higher inference cost and latency; compared with using a general-purpose chat model as a judge, a dedicated reranker is narrower in scope but far cheaper per candidate scored. Because it is served through the same inference providers as other open-weight Qwen models, deployment options range from managed APIs to self-hosting on your own GPUs — see the pricing table on this page for current provider options.

Common Use Cases

Qwen3 Reranker 8B fits the second stage of a retrieval pipeline: after a vector database or keyword index returns a broad candidate set, the reranker reorders a shortlist so the most relevant passages land at the top. This matters most where the number of documents you can pass to a downstream LLM is limited — enterprise document search, customer support knowledge bases, code search, legal and compliance retrieval, and RAG chatbots where a single wrong passage produces a wrong answer. The 8B size is a reasonable choice when relevance quality is worth the extra compute, such as offline evaluation, batch reindexing, or user-facing search where you rerank only a small top-k. For very high query volumes or strict latency budgets, a smaller reranker in the same series, or reranking fewer candidates, is usually the better trade-off.

Frequently Asked Questions

How much does Qwen3 Reranker 8B cost to use?

Pricing varies by inference provider and by pricing model — some bill per million tokens processed, others per request or per GPU-hour if you self-host the open weights. Because rates change frequently and differ between hosts, check the pricing table on this page for current figures rather than relying on a fixed number.

What is Qwen3 Reranker 8B best used for?

It is best used as a second-stage reranker in search and retrieval-augmented generation systems. You retrieve a candidate set cheaply with embeddings or keyword search, then use the reranker to reorder the top results so that the most relevant passages are what your application or downstream LLM actually sees.

Can I use Qwen3 Reranker 8B as a chatbot?

No. It is a reranker, not a generative chat model. It scores how relevant a document is to a query and does not produce conversational responses. If you need text generation, use a Qwen3 chat model and keep the reranker in the retrieval layer.

How does it differ from an embedding model like Qwen3 Embedding?

Embedding models encode queries and documents into vectors independently, which allows precomputed indexes and very fast approximate search across millions of items. A reranker scores the query and document together, which is more accurate but too expensive to run across an entire corpus. The two are complementary: embeddings retrieve, the reranker refines.

Should I choose the 8B reranker or a smaller variant?

The 8B model is the larger option in the Qwen3 reranker line and generally trades higher compute and latency for better relevance discrimination. Choose it when quality on a small top-k shortlist matters most; choose a smaller variant when you are reranking many candidates per query, serving high traffic, or operating under tight latency limits.