Hy3 preview: A Rebuilt Hunyuan, a 21B-Active MoE, and a New Reasoning Receipe

Hy3 preview is a cutting-edge open-source fusion reasoning model developed by Tencent, designed to integrate fast and slow thinking with a notable 295B total parameters and only 21B activated, optimizing efficiency through architectural innovations. It stands out by delivering enhanced complex reasoning and coding performance while maintaining a smaller total and activated parameter count compared to traditional large language models. This model has been integrated into Tencent's ecosystem, notably improving products like Yuanbao, CodeBuddy, and WorkBuddy, and showcasing capabilities in contextual understanding, tool usage, and code generation. The model is distinguished by its ability to process long texts, accurately extract key information, and generate clean, executable code from natural language descriptions. Through architectural upgrades, data quality focus, and integration with Tencent's core businesses, Hy3 preview establishes a systematic advantage in AI-driven products, reinforcing Tencent's technical and ecosystem strengths, and enabling real-time responses and complex task handling across various applications.