Tencent's Hy4 Cuts Hallucinations From 15.76% to 5.45%

Tencent Hy4

Tencent releases Hy4, its strongest open-weight model yet, with scaled-up pre- and post-training and vision for the first time. It adds computer use across CLI and GUI, adapts to Unreal Engine, Unity, and Godot with a 19.1% gain on GameDev, and tops open-weight models on finance and research benchmarks. Hallucinations drop from 15.76% to 5.45%, and weights are planned for open release with vLLM and SGLang support.