Tencent introduced Hy4 on November 4, 2026, presenting it as a major upgrade to its August preview and one of the world’s most capable open-weight models.

The model adds visual understanding and computer-use capabilities, including analyzing dense images and charts, reasoning across multiple images, and operating command-line and graphical interfaces; Tencent says it is trained for workflows involving tools such as Blender and CAD.

Tencent also reports improvements in instruction following, long-context comprehension, extended agentic tasks, and deep research, while acknowledging gaps with leading proprietary models in research-level mathematics, long-horizon coding, self-improvement, and advanced visual question answering.

In a blind evaluation of 579 real-world financial tasks involving 213 professionals, Hy4 scored 3.04, ahead of the other compared open-weight models; Tencent also reported lower hallucination and unsupported-assumption rates than in Hy4 Preview.

Tencent says Hy4 averaged 83.18 in WorkBuddy evaluations and ranked first in nine of 12 tested scenarios in mainland China; it can assist with visual creation, 3D scene building, web development, and workplace collaboration.

Connected to WeCom through WorkBuddy, Hy4 can track project updates across communications and documents, identify outstanding tasks, and flag upcoming meetings and deadlines.

WorkBuddy’s enterprise edition serves more than 50 sectors and is deployed at half of China’s top 500 companies and 60% of its top 100.

For game development, Tencent reports improvements over Hy4 Preview of 19.1% on GameDev and 9.8% on GameLogic benchmarks, with support for Unreal Engine, Unity, and Godot.

Tencent says Hy4 performed strongly on executable research tasks spanning seven disciplines and was used with its Hyra 2.0 harness to optimize pre-training infrastructure; the company also released HyCell for single-cell representations and HyPDE for physics fields.

Tencent says its safeguards emphasize cybersecurity and biosafety: training focused on defensive security and excluded offensive exploitation materials, while internal reviews found limited ability in open-ended biological experiment design.

Hy4 is available through Tencent products including Tencent Cloud TokenHub, WorkBuddy, CodeBuddy, Yuanbao, WeCom’s AI Assistant, and ima, as well as OpenRouter, Hermes, and OpenCode.

Tencent plans to release the model weights and a system card covering technical details and safety evaluations, and is developing a faster, lower-cost Hy4 Flash variant; WorkBuddy and CodeBuddy are free from November 4 to 15, while Hy4 is discounted 50% on TokenHub through December 31.