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HappyHorse 1.0: The Mysterious AI Video Model That Conquered the Leaderboard Overnight

A pseudonymous 15B-parameter model appeared from nowhere, dethroned every incumbent, and turned out to be fully open source

HappyHorse 1.0, a mysterious 15B-parameter AI video model, appeared from nowhere to dominate the Artificial Analysis leaderboard. Built by ex-Kuaishou VP Zhang Di at Alibaba, it delivers native 1080p video with audio in 38 seconds on a single H100 — and it is fully open source.