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HappyHorse 1.0: The Mystery AI Video Model That Topped the Arena and Vanished
2026-04-08HappyHorseAI NewsVideo Generation

HappyHorse 1.0: The Mystery AI Video Model That Topped the Arena and Vanished

On April 7, 2026, an unknown model called HappyHorse-1.0 topped the Artificial Analysis Video Arena leaderboard — then vanished within 48 hours. Here's what we actually know.

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