Solar Mini 4 is Upstage's compact, cost-efficient language model, a 35B-parameter mixture-of-experts with 3B active parameters and a 524K context window. It is built for agentic use cases where response...
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Upstage: Solar Mini 4 holds the #163 spot for context size out of 438 chat models in the CoreAI catalog — 524K tokens, roughly 393,216 words or 786 pages of text in a single conversation. On price, it is the #19 cheapest of 149 budget-tier models by input cost. Released 2026-09-23, it is one of the 3 newest additions to the catalog. It supports step-by-step reasoning (thinking mode).
Every model in this table is available on CoreAI — open the web app and run the same prompt through Upstage: Solar Mini 4 and Upstage: Solar Pro 4 side by side to judge with your own eyes.
A typical question (about 1,000 tokens in, 500 out) runs $0.00015 on Upstage: Solar Mini 4's raw per-token rates; a heavy session with a 50K-token document costs about $0.004. On CoreAI you don't juggle these numbers — one subscription covers Upstage: Solar Mini 4 and 300+ other models under a plan usage limit, with no API keys. See plans.
Upstage: Solar Mini 4 handles 524K tokens of context — roughly 393,216 words, or about 786 pages of text in one conversation.
Upstage: Solar Mini 4's underlying rates are $0.05 per 1M input tokens and $0.2 per 1M output tokens. On CoreAI it is included in one subscription alongside 300+ models, so there is no per-token billing to manage.
No — Upstage: Solar Mini 4 is text-only. If you need image understanding, its budget-tier peers with vision are listed in the comparison table above.
Yes. Upstage: Solar Mini 4 can work through problems step by step before answering; on CoreAI you can toggle thinking mode per message.
Open the CoreAI web app or the iOS/Android app, pick Upstage: Solar Mini 4 in the model selector, and chat — no API key, no per-token billing. One subscription covers Upstage: Solar Mini 4 and 300+ other models.
The closest alternatives on CoreAI are Upstage: Solar Pro 4, Dots Studio: Dots3-Note Preview (free), OpenAI: gpt-oss-20b — similar tier and capability. The fastest way to choose is running one prompt through them side by side in CoreAI's Compare view.
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