---
language:
- en
- ko
license: other
license_name: solar-apache-2.0
tags:
- upstage
- solar
- moe
- 100b
- llm
---

# **Solar Open**

**Solar Open** is Upstage's flagship **102B-parameter** large language model, trained **entirely from scratch** and released under the **Solar-Apache License 2.0** (see [LICENSE](./LICENSE)). As a **Mixture-of-Experts (MoE)** architecture, it delivers enterprise-grade performance in reasoning, instruction-following, and agentic capabilities—all while prioritizing transparency and customization for the open-source community.

## Highlights
* **MoE Architecture (102B / 12B):** Built on a Mixture-of-Experts architecture with **102B total / 12B active parameters**. This design delivers the knowledge depth of a massive model with the inference speed and cost-efficiency of a much smaller model.
* **Massive Training Scale:** Pre-trained on **19.7 trillion tokens**, ensuring broad knowledge coverage and robust reasoning capabilities across various domains.

## Model Overview
* **Model Name:** Solar Open 100B
* **Hugging Face ID:** Upstage/Solar-Open-100B
* **Architecture:** Mixture-of-Experts (MoE)
    * **Total Parameters:** 102.6B
    * **Active Parameters:** 12B (per token)
    * **Experts:** 129 Experts (top 8 among 128 Routed + 1 Shared)
* **Pre-training Tokens:** 19.7 Trillion
* **Context Length:** 128k
* **Training Hardware:** NVIDIA B200 GPUs
* **License:** **Solar-Apache License 2.0** (See [LICENSE](./LICENSE))

## Performance
*Detailed benchmarks and performance metrics will be updated upon the official release on December 31, 2025.*

## Quickstart
*Python code snippets and usage examples will be available upon the official release on December 31, 2025.*

## Public API Access
The official API service for Solar Open is scheduled to launch publicly on **December 31, 2025**.
* **Access:** Upstage Console (Available starting Dec 31, 2025)
* **Documentation:** Upstage Console (Available starting Dec 31, 2025)

## Citation
If you use Solar Open in your research, please cite:
```bibtex
@misc{solar-open-2025,
    title={Solar Open: Scaling Upstage's LLM Capabilities with MoE},
    author={Upstage AI},
    year={2025},
    url={https://huggingface.co/Upstage/Solar-Open-100B}
}
```