Tencent Hy4 Preview Officially Launches on B.AI API with Full Developer Access

Odaily News, September 2 — The B.AI platform announced that Hy4 Preview, the latest open-source flagship model from Tencent's Hunyuan team, has officially launched its API service, providing full developer access. As an early version of the Hy4 series, this model adopts a 770B sparse MoE architecture, activating 49B parameters per token, and supports a 1M ultra-long context window, delivering professional-grade performance in scenarios such as software engineering agents, office data workflows, game development, and scientific research. Starting today, developers can directly call Hy4 Preview through the official B.AI API channel, and visit chat.b.ai/chat for details and an immediate hands-on experience. Going forward, B.AI will continue to introduce cutting-edge models, offering developers a richer and more cost-effective selection of AI computing power.