HappyHorse
Alibaba's #1-ranked AI video model with native audio generation
About
HappyHorse 1.0, developed by Alibaba's ATH AI Innovation Unit, topped the Artificial Analysis Video Arena leaderboard in April 2026 with its defining capability: joint video-audio generation in a single inference pass. Rather than adding audio as a post-processing step, HappyHorse simultaneously produces synchronized ambient sound, narration nuances, and immersive audio alongside cinematic video from a plain text prompt. Backed by Alibaba's $293M investment in parent company ShengShu, the model is available via happyhorse.app with open model weights planned and a public API coming soon.
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