Upstage releases Solar Pro 4, scoring 42 on Intelligence Index

Upstage’s latest reasoning model, Solar Pro 4, just landed with a score of 42 on the Artificial Analysis Intelligence Index. For context, its predecessor, Solar Pro 3, scored 14. That’s a 3x jump in a single generation. The South Korean AI startup, founded in 2020, is positioning Solar Pro 4 as a purpose-built tool for enterprise environments drowning in documents, multi-step workflows, and complex reasoning tasks. The numbers behind the upgrade Solar Pro 4’s benchmark performance tells a story of broad improvement rather than a single flashy headline number. On Terminal-Bench v2.1, a test designed to evaluate agentic task execution, the model scored 57%. Its long-context reasoning score (AA-LCR) hit 71%, reflecting better performance when processing lengthy documents. Multi-turn tool use, measured by the τ³-Banking benchmark, came in at 23%. The most eye-catching figure might be the GDPval-AA v2 Elo rating for real-world work tasks: 1,277. The human baseline on that same evaluation sits at 1,000, meaning Solar Pro 4 is measurably outperforming the average human worker on the specific task categories being tested. The model supports a context window of roughly 524K tokens. Solar Pr...