Tencent has launched Hy4 Preview, a low-cost, open-weight AI model designed to compete with leading systems from OpenAI, Anthropic, DeepSeek, Zhipu AI, and Moonshot AI. Unlike proprietary models such as GPT-5.6 and Claude Opus 5, Hy4 Preview offers publicly available model weights that developers can download and deploy independently, with API pricing starting at $0.042 per million cached input tokens, while regular input costs $0.834 and output costs $2.501 per million tokens. The model has 770 billion total parameters, activates 49 billion parameters per token, and supports a one-million-token context window. Tencent says it delivers significant improvements in software engineering, office productivity, game development, and scientific research, and according to Tencent’s published benchmarks, Hy4 Preview outperforms several competing frontier models in selected coding and productivity tests, though Claude Opus 5, GPT-5.6 Sol, and other rivals remain ahead in some areas. Released on August 28, 2026, Hy4 Preview is available through Tencent Cloud, OpenRouter, and Tencent’s AI applications, and developers can also download its model weights through supported open-source repositories. Hy4 Preview uses a Mixture-of-Experts (MoE) architecture with 78 layers, including 77 MoE layers with 256 routed experts and one shared expert per layer, and uses Gated DeepSeek Sparse Attention