news HappyHorse-1.0: Open-Source AI Video #1 Ranked April 12, 2026 · 6 min read HappyHorse 1.0, a free 15B open-source model, tops the Artificial Analysis Video Arena by 60 Elo over Seedance 2.0. Outputs 1080p with audio in 38 seconds. AI VideoOpen SourceHappyHorse AI Video GeneratorIndustry News +2