Tencent TokenHub surfaced a preview of its Hy3 (Hunyuan) model on April 20, 2026, framed by Tencent as a milestone for the Hunyuan roadmap after a rebuild of parts of its pre-training and reinforcement-learning stack. It is a large Mixture-of-Experts design with approximately 295B total parameters and around 21B activa Hy3 preview is positioned for agentic and production workloads, with particular emphasis on code generation, multi-step tool use, and cross-file refactoring across many turns. It exposes a native long context window for long-document analysis and complex pipelines, configurable reasoning modes that let developers trade