On September 2, the B.AI platform announced that Hy4 Preview, the latest open-source flagship model from Tencent's Hunyuan team, has officially launched through its API service and is now fully open for developer access. Hy4 Preview is described as an early version in the Hy4 series. The underlying architecture is a 770B sparse mixture-of-experts (MoE) design, with 49B parameters activated for every token processed. The model also provides an extended context window of up to 1 million tokens. According to B.AI, that combination gives the model professional-grade performance in software engineering agents, office data workflows, game development, and scientific research. Starting immediately, developers can call Hy4 Preview directly through the official B.AI API channel. For further information, they can visit chat.b.ai/chat for more details and immediate testing. B.AI also said that going forward it will continue to introduce frontier models, providing developers with a richer and more cost-effective range of AI compute options.
Hy4 Preview launch on B.AI API
On Sept. 2, B.AI announced that Hy4 Preview, the latest open-source flagship model from Tencent's Hunyuan team, is now available through its API service. The rollout is fully open to developers.
Architecture and target scenarios
Hy4 Preview is positioned as an early version of the Hy4 series. It uses a 770B sparse mixture-of-experts (MoE) architecture, activating 49B parameters for each token, and supports an extended context window of up to 1 million tokens. According to B.AI, the model is capable of professional-grade performance in software engineering agents, office data workflows, game development, and scientific research.
Access and roadmap
Starting today, developers can call Hy4 Preview directly through B.AI's official API channel. More details are available at chat.b.ai/chat, where the model can be tested immediately. B.AI also said it will continue to bring in frontier models, providing developers with a richer, more cost-effective set of AI computing options.
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