Solar Pro 3

Solar Pro 3 - Multilingual Mixture-of-Experts LLM

Solar Pro 3 is presented by Upstage as a Mixture-of-Experts language model designed for reasoning, tool use, and multilingual performance, with a strong focus on Korean.

Defining Characteristics

• Mixture-of-Experts architecture: Officially described as a MoE model with 102B total parameters and 12B active parameters per forward pass, emphasizing computational efficiency.
• 128K context window: The model is documented with a 128K token context window, supporting long prompts and extended workflows.
• Korean-first multilingual support: Upstage positions Solar Pro 3 as optimized for Korean, with English and Japanese support also documented.
• Tool use and structured outputs: Official and provider documentation mention tool use, function calling, and structured output/schema-compliant generation.

Core Design

• Solar Pro 3 is framed as a reasoning-oriented enterprise model rather than a general chat model, with agent-like workflows called out in official partner documentation.
• The model is available through Upstage-related platforms and partner integrations, including Puter.js and OpenRouter listiter.js and OpenRouter listings.