Solar Pro 2 (Reasoning) is Upstage's reasoning-mode variant of its preview flagship, released May 2025. At an intelligence index of 12.5, MMLU-Pro of 0.768, and GPQA of 0.578, it outperforms its non-reasoning sibling across all key benchmarks. The LiveCodeBench score of 0.462 places it in the upper-mid tier for coding capability among models at this intelligence level.

For business use, the reasoning mode makes it well-suited to complex analysis, multi-step problem solving, and technical content generation. It would serve software teams needing a capable coding assistant and analysts working on structured reasoning tasks. The trade-off versus the non-reasoning variant is likely higher latency per response.

No pricing data is available, and the model remains in preview, so production deployment carries some risk around stability and support. It is a strong candidate to monitor as it matures, particularly for teams that prioritise reasoning depth over raw speed.

Assessed June 17, 2026

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