MedicineImage + text

NV-Reason-CT

A language model for computed tomography: looks at a whole chest or abdominal CT volume, not separate slices, writes structured reports and answers questions with reasoning. English only.

Developer
NVIDIA, USA
First release
Sep 2026
Latest release
Sep 2026
Sizes
4B (based on Qwen3.5-4B with a 3D encoder)
License
Commercial use allowedOpenMDW 1.1; a research model, not a clinical product
Russian
Not supported
Running
On your own serverNeeds a GPU
Industries
Healthcare, Science and research
Deploy on your server Hugging Face

What it does

  • a draft CT report for a physician
  • yes-or-no answers about a scan with reasoning
  • research in medical imaging

Where it is used

clinics and radiology (for prototypes and research)medical software developersuniversities

Hardware requirements

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

Versions

  1. NV-Reason-CT

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 NV-Reason-CT be used in a commercial project?

Yes. License: OpenMDW 1.1; a research model, not a clinical product. It allows commercial use, but it is still worth having a lawyer review the license before launch.

What hardware does NV-Reason-CT need?

At minimum: One GPU with 16–80 GB — mid-size 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 NV-Reason-CT support Russian?

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

Where can I download NV-Reason-CT and what does it cost?

The NV-Reason-CT 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/nvidia/NV-Reason-CT. Data checked against the model card on 22 Sep 2026. Have a lawyer review the license before commercial launch.