Tencent Hunyuan Releases Hy4 Preview as an Open Model for Productivity Work
The AMW Read
Tencent's open Hy4 Preview materially advances its position in the open-model field by combining large-model scale, long context, product distribution, and API availability.
Tencent Hunyuan Releases Hy4 Preview as an Open Model for Productivity Work
Tencent Hunyuan released and open-sourced Hy4 Preview on August 28. The model uses 770 billion total parameters with 49 billion activated parameters and supports a context window above one million tokens. Tencent positions it for software engineering, office analysis, game development, and scientific research. In an internal blind evaluation involving 163 experts and 203 engineering tasks, Tencent said Hy4 Preview scored 2.99 out of 4, compared with 2.92 for GLM 5.3 and 2.94 for Kimi K3.
The release matters less as a standalone benchmark claim than as another major Chinese platform company pairing open model weights with its own distribution surfaces. Tencent launched Hy4 Preview simultaneously in WorkBuddy, CodeBuddy, Yuanbao, and ima, while also offering API access through Tencent Cloud Tokenhub and OpenRouter. Its stated pricing is RMB 6 per million input tokens, RMB 18 per million output tokens, and RMB 0.3 per million cached tokens. That combination gives Tencent a route to gather usage feedback from productivity products while competing for external developers on cost and availability.
Builders should test Hy4 Preview on long-context and multi-file workflows that resemble their actual deployments, rather than relying on Tencent's internal scorecard. The two-week free-access period in WorkBuddy and CodeBuddy can lower the cost of evaluation, while the API channels make comparison against other open models more practical. Investors should watch whether Tencent can turn product distribution and rapid iteration into externally validated adoption, especially in coding and office workflows where model quality, integration, and inference economics are tightly linked.
