Solar Pro 2 is Upstage's latest frontier-scale LLM. With just 31B parameters, it delivers top-tier performance through world-class multilingual support, advanced reasoning, and real-world tool use. Especially in Korean, it outperforms much larger models across critical benchmarks. Built for the next generation of practical LLMs, Solar Pro 2 proves that smaller models can still lead.

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Best-in-class Korean performance

Solar Pro 2 supports users and businesses worldwide with its exceptional multilingual processing capabilities. It not only excels in Korean but also demonstrates impressive performance in major language benchmarks for English and Japanese, breaking down global communication barriers. See the table below for Solar Pro 2's outstanding achievements across various key language benchmarks.

Beyond Ko-Arena-Hard-Auto, Solar Pro 2 demonstrates robust performance across a wide range of general Korean NLP tasks. It leads crucial benchmarks such as Ko-MMLU, Hae-Rae, and Ko-IFEval, demonstrating its robust performance in core language understanding and generation. Its excellence also extends to specialized Korean domains, including legal, financial, and medical texts.

Solar Pro 2 sets a new standard for Korean language performance. It demonstrates robust performance across a wide range of general Korean NLP tasks. It leads crucial benchmarks such as Ko-MMLU, Hae-Rae, and Ko-IFEval, demonstrating its robust performance in core language understanding and generation. From summarization and translation to document comprehension and open-ended Q&A, it rivals or surpasses much larger top-tier models across diverse tasks. Its excellence also extends to specialized Korean domains, including legal, financial, and medical texts.

Solar Pro 2 achieves comparable performance to GPT-4 and Claude 3 in Ko-Arena-Hard-Auto benchmarks. This highlights its ability to deliver natural and accurate responses that compete with top-tier models even in complex, adversarial scenarios.

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Next-level intelligence: The power of complex reasoning

Solar Pro 2, building on its exceptional understanding of Korean and beyond, is designed to do more than predict the next word—it solves problems. With strong multi-step reasoning and highly accurate analysis, it tackles tasks like complex math, document summarization, and logical deduction.

When operating in its advanced Reasoning Mode, Solar Pro 2 demonstrates exceptional capabilities across various complex challenges. The data presented in the accompanying benchmark table clearly illustrates its superior performance in these areas:

• Significantly improves multi-step task performance, as evidenced by strong results on general reasoning benchmarks like MMLU, MMLU-Pro and HumanEval.
• Excels on advanced math problems, as shown on benchmarks like Math500 and AIME, a benchmark known for its complex mathematical reasoning.
• Demonstrates strong capabilities in complex code and software engineering tasks, as shown on benchmarks like SWE-Bench Agentless.
• Achieves exceptional reasoning efficiency per parameter.

Despite being a 31B model, Solar Pro 2 competes with and often outperforms models more than twice its size—demonstrating superior problem-solving efficiency.

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Enhanced tool use capabilities

Solar Pro 2 is optimized for intelligent interaction with external tools. Beyond merely understanding language, it acts much like a human, communicating with its environment, thinking autonomously, and executing necessary functions. The example below illustrates how Solar Pro 2 leverages tools in a business environment to transform complex requests into actionable outcomes.

This demonstrates Solar Pro 2's fundamental ability to seamlessly interact with various tools, process complex business data, and provide actionable deliverables, proving its crucial role in enhancing enterprise productivity.

Experience Solar Pro 2

Ready to experience the new frontier? Solar Pro 2 is now available. Begin your journey with a smaller, smarter, and more reasoning-capable model.

• Start Testing on Console↗︎
• Explore Developer Docs↗︎
• Talk to Our Solutions Team

With the official launch of Solar Pro 2, we are committed to continuous innovation, bringing further enhancements such as improved usability and stability for enterprise adoption, and enterprise-grade deployment through cloud marketplaces and on-premises. Our next post will explore real-world industry use cases and product integrations, demonstrating how Solar Pro 2 performs in domains like insurance, healthcare, finance, or manufacturing.