Upstage launches Solar Mini 4, a 3B-active MoE for agent workloads
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Solar Mini 4: Built for High-Volume Agent Workloads Top overall performance among active-3B models, with lower costs for repetitive agent work. Solar Mini 4 is a 35B MoE model pretrained from the ground up by Upstage. It activates just 3B parameters per token, drawing on the full model's capacity while using far less compute. That makes it fast and cost-efficient for agent workloads built on repeated retrieval, structuring, and tool calls. Solar Mini 4 is available now on Upstage Console, Solar Chat, and OpenRouter, with on-premises deployment also supported. To celebrate the launch, API pricing on Upstage Console and OpenRouter is 70% off through October 10 (UTC). Make repetitive agent work more efficient. Try Solar Mini 4 today.
Solar Mini 4 activates only 3B of 35B parameters, targeting repeated retrieval, structuring and tool calls at lower cost. API pricing is 70% off through October 10 UTC.
- mixture-of-experts — A model built from many specialist sub-networks where only a few activate per token, giving big-model capability at small-model running cost.
- AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
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