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Solar Mini 4

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Compact model from Upstage for agent-style tasks, with a 512K-token context and three-language support in Korean, English and Japanese

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About Solar Mini 4

Solar Mini 4 is a compact language model from Upstage, built for agentic applications where fast responses and efficiency matter. Upstage released it on 22 September 2026, and it works in Korean, English and Japanese.

What Solar Mini 4 does

  • Chat and reasoning: conversational text generation, with an optional reasoning mode.
  • Structured output and tool calling: returns results in a set format and calls external functions, which suits agent workflows.
  • Large context: a 512K-token context window and up to 128K output tokens.
  • Access options: available through the Upstage Console and Playground, with on-premises deployment offered by Upstage.

Clients

Developers and teams running high-volume work who want a smaller alternative to Solar Pro 4. Buyers should test it on their own tasks, particularly in languages beyond the three it supports.

Key facts

  • Parameters: 35 billion in total, with about 3 billion active per token.
  • Training data: cut-off in February 2026.
  • Languages: Korean, English and Japanese.
  • Weights: no downloadable weights have been published.

Profile written by TrustList from the business's own published information, Oct 2026.

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Trust Score

4/ 100
Trust Score: New

An earned signal from verification, reviews, awards, transparency and engagement - the vendor can't buy it.

Verification
0/100 · 20%
Reviews
0/100 · 30%
Awards
0/100 · 15%
Transparency
18/100 · 20%
Engagement
0/100 · 15%
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Updated 9/22/2026

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