Solar Mini 4

Solar Mini 4 is Upstage's cost-efficient proprietary mixture-of-experts language model with 35B total and 3B active parameters, built for agentic workloads where speed and cost matter. It is text-only with English, Korean, and Japanese support, plus reasoning mode, tool calling, and structured outputs. Upstage Console docs list a 512K context window, up to 128K max output, and a February 2026 training cutoff, with list pricing of $0.10 input / $0.40 output / $0.01 cached per million tokens. The six catalog scores are third-party independent evaluations from Artificial Analysis (AA-LCR 83.3, SciCode 47.6, HLE text-only 25.8, Terminal-Bench 4.0 1.0, GDPval-AA v2.1 1072 Elo, AA-Briefcase v1.1 872 Elo).