HappyHorse 1.1 is a newly upgraded AI video model built to support higher-quality professional video generation. Since the release of HappyHorse 1.0, the model has been used across short drama production, ecommerce advertising, brand marketing, CG, and other content workflows. HappyHorse 1.1 improves motion modeling and temporal consistency so characters and objects move more naturally through complex action scenes. The model also strengthens subject consistency and multi-reference fusion, making it easier to preserve character identity, product details, brand assets, environments, storyboards, and multi-panel references. Its improved instruction following helps the model better understand creative intent, character relationships, long-context prompts, and multi-scene narrative planning. HappyHorse 1.1 upgrades visual quality with more detailed character rendering, more natural skin texture, better close-up expressiveness, and stronger cinematic camera language. It also improves audio expression by making dialogue, pacing, pauses, tone, ambient sound, background music, and sound effects better match the scene. Developers and enterprise customers can access HappyHorse 1.1 through API support for T2V, I2V, R2V, multi-image references, flexible aspect ratios, and 720p or 1080p output. HappyHorse 1.1 helps creative teams produce smoother, more realistic, better synchronized, and more controllable AI-generated videos.