Tencent Open-Sources Hy3 Foundation Model, Scoring 74.4% on SWE-bench

Tencent has open-sourced Hunyuan Hy3, a foundation model led by former OpenAI researcher Yao Shunyu, releasing a preview on April 23, 2026 and the full version under an Apache 2.0 license on July 6. The Mixture-of-Experts (MoE) model carries 295B total parameters but activates only 21B per token, emphasizing coding and agentic performance alongside cost efficiency. It is available on Hugging Face and GitHub, supports Tencent's OpenClaw agent framework, and was immediately integrated into in-house products including the Yuanbao chatbot, CodeBuddy, WorkBuddy and QQ.