Solar Mini 4
Upstage · 2026-09-22
Upstage's September 22, 2026 Solar Mini 4 API snapshot, served by the solar-mini4 alias. The official card describes a compact 35B-total/3B-active model with 512K context, text generation, tool calling, and optional reasoning. The native API defaults reasoning off and accepts low through max to enable it. Distinct from the older Solar Mini artifact; its month-only February 2026 training cutoff is not stored as a fabricated date.