Rooms 812-817, Spark Plus Gangnam Branch 5, Korea Science and Technology Center Hall 2, 22 Teheran-ro 7-gil, Gangnam-gu, Seoul, South Korea
Upstage
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Upstage's[1][2][3][5] launch post "Solar Pro 4: The Agentic Model That Finishes the Job" is dated August 11, 2026 and its launch promotion runs through September 10; OpenRouter[4] lists the model as released Aug 10, 2026 (14:20 UTC, late evening in Seoul the day before).Upstage releases Solar Pro 4, an API-only agentic model with a 512K context window that scores 57 on Terminal-Bench v2.1, up from 12 for Solar Pro 3, at $0.30 per 1 million input tokens.