Tencent releases open-source Hy4-preview mixture-of-experts model

Tencent has released Hy4-preview, a mixture-of-experts model with 770 billion parameters in total, of which only about 49 billion are active per token, it was reported on 28 August 2026. Coding, office, scientific research and financial analysis are named as target uses, and the weights and model materials are available on Hugging Face.

The release widens the choice of high-capacity open-weight systems and raises the importance of sparse-model deployment economics. The vendor's benchmark claims need independent re-testing.

Although the active-parameter count is low, deployment is not small: memory, expert routing, interconnect and serving software requirements remain substantial. Licence terms, multilingual quality, tool-use safety and real workload costs should be tested.