Fact-checking and judges

CompassJudger / CompassVerifier

A line of judges from the team behind open model benchmarks: they score answers and check them against a reference. The judge itself makes mistakes and does not replace manual review on important tasks.

Developer
OpenCompass (Shanghai AI Laboratory), China
First release
Sep 2024
Latest release
Jul 2025
Sizes
1.5B – 32B
License
Commercial use allowedApache 2.0
Russian
Not supported
Running
On your own serverAlso runs without a GPU
Industries
Software development, Science and research, Education
Deploy on your server Hugging Face GitHub

What it does

  • Scoring model answers against set criteria
  • Checking an answer against a reference solution
  • Comparing several models on your own data

Where it is used

IT and software developmentResearch and scienceEducation and staff training

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. CompassJudger-2 (7B, 32B) и CompassVerifier (3B, 7B, 32B)
  2. CompassJudger-1 (1.5B, 7B, 14B, 32B)

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 CompassJudger / CompassVerifier 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 CompassJudger / CompassVerifier need?

At minimum: Laptop or regular PC, up to 8 GB of VRAM — smaller versions. Some versions also run on an ordinary CPU, without a GPU. You can calculate the exact VRAM for your model size and context in the hardware calculator.

Does CompassJudger / CompassVerifier support Russian?

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

Where can I download CompassJudger / CompassVerifier and what does it cost?

The CompassJudger / CompassVerifier 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.

Similar models

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An open judge model: it scores other models' answers against your criteria and explains the score. A replacement for paid models in the reviewer role.

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An 8B judge model: it scores another model answer against your criteria and writes a rationale. The judge itself makes mistakes and does not replace manual review on important tasks.

DetailsFact-checking and judgesSkywork-RewardSkywork (Kunlun Tech) · ChinaCommercial use with conditions

Reward models: they score how good a language model's answer is for the user. Used for fine-tuning your own models and picking the best of several answers.

Details

Source: huggingface.co/opencompass/CompassJudger-2-7B-Instruct. Data checked against the model card on 22 Sep 2026. Have a lawyer review the license before commercial launch.