Solar Mini 4

#9 in Reasoning Models

Upstage · v4 · mini · 4× · last seen Oct 03, 2026

40

Momentum

Solar Mini 4 is a proprietary, text-based Reasoning model from Upstage, released as a compact counterpart to Solar Pro 4 on September 22/23, 2026. It uses a Mixture-of-Experts architecture with 35 billion total parameters, of which only approximately 3 billion are actively used during Inference, enabling low costs and high speed. The model achieved 24 points on the Artificial Analysis Intelligence Index and is considered by the manufacturer to be the top-ranked model in its active-parameter class; specifications regarding parameter size and context window come from the manufacturer itself and cannot be independently verified for a proprietary model. It is available via the Upstage console, OpenRouter, and for on-premise deployment, and supports Korean, English.

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