Upstage Releases Solar Open 2 — Powerful MoE Model

Upstage Releases Solar Open 2 — A Powerful MoE Model

South Korean company Upstage has introduced Solar Open 2, an open-weight MoE model with 250 billion parameters and a context window of up to 1 million tokens.

Compiled by Sergey KostenchukPublished 2026-07-23Updated 2026-07-23

2026-07-23 Research HuggingFace

🤖 Upstage Releases Solar Open 2 — A Powerful MoE Model

South Korean company Upstage has introduced Solar Open 2 — a sovereign open-weight MoE architecture model with 250B parameters (15B active per token). Thanks to hybrid attention, the model supports a context window of up to 1 million tokens and is optimized for AI agent workflows.

🌍 The emergence of a powerful open-weight model reduces dependency on proprietary APIs for building complex AI agents. Hybrid attention allows for resource savings when processing massive documents.

👤 You can run a highly efficient "agent" on limited hardware (for example, on two H200 GPUs with quantization) to automate coding and text analysis.

Source 1: https://www.upstage.ai/blog/en/solar-open-2 Source 2: https://huggingface.co/upstage/Solar-Open2-250B

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