Upstage Solar Pro 4 ships: a cheap agentic model built for real work
Terminal-Bench 57, 512K context, 90% off to Sept 10 — plus a heads-up that Qwen3.8's open weights are due on Hugging Face this week.
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Tuned for the jobs agents actually do
Solar Pro 4 posts 57 on Terminal-Bench v2.1 (multi-step shell work), 71 on long-document reasoning across ~100K tokens, and 23 on multi-turn tool use — jumps of +13.8, +8.3 and +7.4 over Solar Pro 3, all on tasks that resemble real work rather than trivia. It handles a 512K-token context with up to 128K output, in English, Korean and Japanese.
The price is the story
List pricing is $0.30 per million input / $1.20 output (cached input $0.06), but a launch promo cuts that 90% on Upstage Console and OpenRouter through Sept 10 — roughly $0.03/$0.12 while it lasts. That undercuts most frontier tool-callers, making it a cheap backbone to point an agent loop at this month.
Build this weekend: an office-doc agent
Upstage ships an Agent Cookbook plus no-code Studio agents that generate Excel workbooks, evidence-backed Word reports, and PowerPoint decks with charts and speaker notes. You can try it key-free in SolarChat, and Nous Research's Hermes Agent grants free access through Aug 18 — enough to wire up a document-drafting agent over a Saturday.
Elsewhere: Qwen3.8 open weights due this week
Alibaba has committed to publishing open weights for Qwen3.8-27B — a local-friendly dense model — alongside the 2.4T-parameter, 1M-context Qwen3.8-Max, reportedly during the week of Aug 10. As of Aug 10 nothing had appeared on the Qwen Hugging Face org and the license is still undisclosed, so watch the org page directly rather than mirrors before you download.