Rerankers

zerank (ZeroEntropy)

Rerankers built on Qwen3. The model card lists the target domains — finance, law, code, medicine, science; the stated language is English.

Developer
ZeroEntropy, USA
First release
Jun 2025
Latest release
Nov 2025
Sizes
zerank-2 — 4B (based on Qwen3-4B), plus a smaller "small" version
License
Commercial use allowedApache 2.0
Russian
Not supported
Running
On your own serverNeeds a GPU
Industries
Software development, Documents and accounting, Legal, Finance
Deploy on your server Hugging Face

What it does

  • Refining results before an AI assistant answers
  • Sorting search results across contracts and reports
  • Search across technical and scientific documentation

Where it is used

IT and software developmentLegal and complianceFinance and analytics

Hardware requirements

LaptopLaptop or regular PC, up to 8 GB of VRAM — smaller versions
fits
1 GPUOne GPU with 16–80 GB — mid-size versions
fits
ClusterServer with several GPUs — flagship versions
no versions

Versions

  1. zerank-2
  2. zerank-1 и zerank-1-small

How to run it

On your own serverWeights are downloaded from Hugging Face and served with vLLM (load and API) or llama.cpp (modest hardware). The model then runs in a closed network with no per-request fees.Hugging Face
How much hardware you needCalculate the VRAM for the model size, context length and number of concurrent requests.Open the hardware calculator

I can set this up end to end: pick the model size, deploy it on your server and connect it to your systems.

Frequently asked questions

Can zerank (ZeroEntropy) be used in a commercial project?

Yes. License: Apache 2.0. It allows commercial use, but it is still worth having a lawyer review the license before launch.

What hardware does zerank (ZeroEntropy) need?

At minimum: Laptop or regular PC, up to 8 GB of VRAM — smaller versions. Without a GPU the model is not practical. You can calculate the exact VRAM for your model size and context in the hardware calculator.

Does zerank (ZeroEntropy) support Russian?

No. The developer documentation lists the supported languages and Russian is not among them.

Where can I download zerank (ZeroEntropy) and what does it cost?

The zerank (ZeroEntropy) weights are open and free to download. You only pay for the hardware it runs on and for the setup. Source links are at the bottom of this page.

How I deploy it for clients

  1. SelectionI pick the model size for your task and hardware and test it on your examples.
  2. DeploymentI deploy it on your server or in a closed network and provide an API.
  3. Fine-tuningI fine-tune it on your data (LoRA) or connect a knowledge base — whichever is cheaper for the task.
  4. IntegrationI connect it to your CRM, ERP, bot, website or team chat and set up monitoring.

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Details

Source: huggingface.co/zeroentropy/zerank-2-reranker. Data checked against the model card on 22 Sep 2026. Have a lawyer review the license before commercial launch.