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Solar

Models from Korea's Upstage. Solar Open 2 is built for office document work: 250 billion parameters, 15 billion active; languages are English, Korean and Japanese.

Developer
Upstage, South Korea
First release
Dec 2023
Latest release
Jul 2026
Sizes
10.7B – 250B-A15B
License
Commercial use with conditionsSOLAR-10.7B: Apache 2.0; Solar Open and Open 2: Upstage Solar License (based on Apache 2.0: commercial use allowed, but a fine-tuned model's name must start with Solar, plus a Built with Solar notice)
Russian
Not supported
Ready-made builds
GGUF, AWQ
Running
Available in OllamaNeeds a GPU
Industries
Documents and accounting, Software development
Deploy on your server Hugging Face

What it does

  • Working with office documents
  • Agents for routine tasks
  • Help for developers

Where it is used

Document managementBack officeWork with Korean and Japanese partners

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
fits

Versions

  1. Solar Open 2 250B
  2. Solar Open 100B
  3. Solar Pro Preview
  4. SOLAR-10.7B

How to run it

With Ollama — the fastest wayInstall Ollama on your computer or server and find the model in its library by name. Good enough to try the model on your own tasks in one evening.Find it in the Ollama library
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. Quantization compresses a model so it takes less video memory and runs on more modest hardware. Answers change slightly, so quality is checked on your own examples.

Frequently asked questions

Can Solar be used in a commercial project?

With conditions. License: SOLAR-10.7B: Apache 2.0; Solar Open and Open 2: Upstage Solar License (based on Apache 2.0: commercial use allowed, but a fine-tuned model's name must start with Solar, plus a Built with Solar notice). Restrictions vary — region, company revenue, attribution requirements. Have a lawyer check the terms before a commercial launch.

What hardware does Solar 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 Solar support Russian?

No. The model card lists its languages and Russian is not among them.

Where can I download Solar and what does it cost?

The Solar 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/upstage/Solar-Open2-250B. Data checked against the model card on 22 Sep 2026. Have a lawyer review the license before commercial launch.