Tencent released open-source Hy4 preview model
Tencent is positioning Hy4 preview as a long-context work model, not just another benchmark release.
The model has 770 billion parameters, 49 billion active parameters, and a one-million-token context window. Tencent says it is aimed at extended software work, document-heavy office tasks, game development, and scientific research. The company cites internal expert comparisons where Hy4 preview narrowly outscored GLM 5.3 and Kimi K3 across engineering tasks. Tencent also calls it an early version, noting it can reason longer than needed and over-verify its own work. TestingCatalog's note
The model has 770 billion parameters, 49 billion active parameters, and a one-million-token context window. Tencent says it is aimed at extended software work, document-heavy office tasks, game development, and scientific research. The company cites internal expert comparisons where Hy4 preview narrowly outscored GLM 5.3 and Kimi K3 across engineering tasks. Tencent also calls it an early version, noting it can reason longer than needed and over-verify its own work. TestingCatalog's note
score 7