Solar Open 100B (Reasoning)
Analysis Summary
Solar Open 100B Reasoning is Upstage's open reasoning model, with a general capability result below the level expected for difficult client work. Its instruction-following and long-context measurements are more useful than its terminal result, and no coding index is supplied. The available evidence therefore supports controlled assistance rather than independent execution.
Potential applications include summarisation, content restructuring, research notes, and internal drafting where teams can review outputs. It is not a strong choice for coding agents, complex tool chains, or high-stakes customer-facing content without additional evaluation. Pricing is not supplied, so the business case cannot be established through token economics, and no context-window size is provided.
Consider it for supervised or self-hosted experiments where openness matters. For production marketing and engineering workflows, validate it against a stronger commercial or open alternative first.
Assessed August 9, 2026
Editorial notes
Solar Open 100B Reasoning offers useful instruction following and long-context results in an open model, but limited general reasoning and weak terminal performance restrict it to supervised workflows.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Solar Open 100B Reasoning offers useful instruction following and long-context results in an open model, but limited general reasoning and weak terminal performance restrict it to supervised workflows.
Benchmark scores
Magenta = intelligence · Ink = technical/agentic · Cyan = content & long-context · Grey = community benchmarks. Data: Artificial Analysis, Hugging Face.
15.2 Intelligence Index
How Solar Open 100B (Reasoning) compares
Solar Open 100B (Reasoning) ranks #208 of 425 AI models we track for overall intelligence. Solar Open 100B (Reasoning) is currently free to use via OpenRouter.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on content. The pulled-in value corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side →Frequently asked questions about Solar Open 100B (Reasoning)
How much does Solar Open 100B (Reasoning) cost?
Solar Open 100B (Reasoning) is currently available for free via OpenRouter.
Who created Solar Open 100B (Reasoning)?
Solar Open 100B (Reasoning) is developed by Upstage and was released on December 17, 2025.