Solar Pro 2 (Preview) (Reasoning)
Analysis Summary
Solar Pro 2 Preview Reasoning is Upstage's reasoning variant, with supplied results across general reasoning, knowledge, coding, and scientific coding. Its MMLU Pro and GPQA results are useful for a smaller model, while live coding is stronger than its scientific coding result, suggesting uneven technical performance.
The model could support research prototypes, structured experimentation, and selected analytical tasks. It is not a preferred option for autonomous agents, production software engineering, or high-stakes client content because its overall measured capability remains limited and the preview status adds operational uncertainty. No pricing, context, tool-use, or multimodal information is supplied.
Assessed September 7, 2026
Editorial notes
Solar Pro 2 Preview Reasoning performs better than its non-reasoning sibling across reasoning and coding measures, but remains a limited preview model without supplied evidence of dependable tools, long context, or production readiness.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Solar Pro 2 Preview Reasoning performs better than its non-reasoning sibling across reasoning and coding measures, but remains a limited preview model without supplied evidence of dependable tools, long context, or production readiness.
Benchmark scores
Magenta = intelligence · Ink = technical/agentic · Cyan = content & long-context · Grey = community benchmarks. Data: Artificial Analysis, Hugging Face.
6.7 Intelligence Index
How Solar Pro 2 (Preview) (Reasoning) compares
Solar Pro 2 (Preview) (Reasoning) ranks #267 of 435 AI models we track for overall intelligence. Solar Pro 2 (Preview) (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 Pro 2 (Preview) (Reasoning)
How much does Solar Pro 2 (Preview) (Reasoning) cost?
Solar Pro 2 (Preview) (Reasoning) is currently available for free via OpenRouter.
Who created Solar Pro 2 (Preview) (Reasoning)?
Solar Pro 2 (Preview) (Reasoning) is developed by Upstage and was released on May 20, 2025.