Tencent opens 770B-parameter Hy4 preview

Tencent has open-sourced Hy4 preview, a 770-billion-parameter model with 49 billion active parameters and a context window above 1 million tokens. Tencent’s launch note sets API pricing at $0.834 per million input tokens, $2.501 per million output tokens, and $0.042 per million cached tokens, while making the model free in WorkBuddy and CodeBuddy for two weeks. Builders with long documents or codebases should benchmark Hy4 against the Chinese price advantage documented in the archive’s analysis of Chinese AI’s 46% U.S. token share before paying frontier-model rates; Tencent’s internal comparisons still need independent replication.