Tencent released Hy4 preview, a large language model with 770B parameters and over 1M token context window, designed for coding, office work, and scientific research. The model outperformed competitors like GLM-5.3 and Kimi K3 in Tencent's internal evaluation and can be accessed free for two weeks through WorkBuddy and CodeBuddy.

• Hy4 preview scored 2.99/4.00 in Tencent's blind evaluation of 203 engineering tasks, beating GLM-5.3 (2.92) and Kimi K3 (2.94)
• The model participated in its own development, autonomously optimizing training methods and inference infrastructure, increasing throughput by 31.8% over baseline
• Pricing is competitive at $0.834 per million input tokens and $2.501 per million output tokens, with specialized optimization for game development and scientific research tasks