Solar Pro 2 (Preview) (Reasoning)
Analysis Summary
Solar Pro 2 Preview Reasoning is Upstage's reasoning variant and the strongest measured model in this batch. Its supplied results show useful performance in general knowledge, difficult question answering, and coding, with coding evidence that could support developer assistance and structured problem solving.
The model is a candidate for reviewed code generation, research summaries, analytical drafting, and other workflows that benefit from deliberate reasoning. It should not yet be the sole engine for autonomous agents or high-stakes client delivery because context, speed, pricing, function calling, and deployment reliability are not supplied. Adopt it for controlled pilots, with human review and comparison against current flagship systems.
Assessed August 9, 2026
Editorial notes
Solar Pro 2 Preview Reasoning combines the strongest reasoning and coding evidence in this batch with useful knowledge benchmarks, but preview status and missing operational data limit production confidence.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Solar Pro 2 Preview Reasoning combines the strongest reasoning and coding evidence in this batch with useful knowledge benchmarks, but preview status and missing operational data limit production confidence.
Benchmark scores
Magenta = intelligence · Ink = technical/agentic · Cyan = content & long-context · Grey = community benchmarks. Data: Artificial Analysis, Hugging Face.
12.5 Intelligence Index
How Solar Pro 2 (Preview) (Reasoning) compares
Solar Pro 2 (Preview) (Reasoning) ranks #242 of 428 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.