Hy4

Tencent's chief AI scientist Yao Shunyu warns that AI will soon be capable of developing bioweapons, and argues that neither fully open nor fully closed models can address the risk alone. He advocates a hybrid open-closed approach so all parties can use the technology for defense, urging the industry to proceed carefully. Tencent also previewed an open-weight model, Hy4, with a safety report claiming its biological capabilities fall below the high-risk threshold.

Tencent Hunyuan unveiled Hy4, its next-generation LLM, scaling pretraining and post-training data and compute, adding vision understanding and Computer Use for the first time, and markedly improving instruction following, long-context comprehension and long-horizon agent performance. Tencent claims Hy4 ranks among the strongest open-source models and will release weights and a system card soon.