What is HappyHorse?

HappyHorse is an open-source AI video generation model that jointly generates video and synchronized audio in a single pass. It features a 15B-parameter, 40-layer Transformer architecture that processes text, video, and audio tokens simultaneously. The model supports text-to-video and image-to-video generation, native 1080p/2K output, and multilingual lip-sync for 7 languages.

How to use HappyHorse?

Users can start generating videos by visiting the HappyHorse website, selecting text-to-video or image-to-video mode, uploading a reference image or video, and choosing parameters like aspect ratio, duration, and resolution. The platform offers a credit-based system where users can generate videos and browse other tabs while waiting for generation to complete. For developers, the model is fully open source and can be fine-tuned and deployed on their own GPU infrastructure.

Core features of HappyHorse

Joint audio-video generation in a single pass
15B-parameter unified Transformer architecture
8-step fast inference with DMD-2 distillation
Native 1080p/2K output with super-resolution module
7-language lip-sync support (Mandarin, Cantonese, English, Japanese, Korean, German, French)
Text-to-video and image-to-video generation
Multi-shot narrative capabilities
Fully open source with commercial-friendly license