From the source
At Upstage, we’ve consistently focused on delivering more with less—less compute, fewer GPUs, and smaller models that outperform their size.
That philosophy powered Solar Mini and Solar Pro.
Today, we’re excited to unveil Solar Pro 2 Preview —our most capable model yet.
It’s compact and efficient as always, now with robust reasoning capabilities.
Here’s what sets it apart: Small yet powerful : At 31B parameters, Solar Pro 2 Preview matches the performance of models up to 70B in size.
Multilingual strength : It excels in English, Japanese, and especially Korean—outperforming ~70B models in multiple benchmarks.
Hybrid modes : Users can choose between chat mode for fast responses and reasoning mode for structured, multi-step problem solving.
31B model with 72B-class performance Solar Pro 2 Preview rivals models twice its size, like Llama 3.3 70B and Qwen2-72B.
Through advanced optimization and targeted pre-training, it delivers top-tier performance while remaining deployable at a fraction of the cost.
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