The #1 ranked open-source video model with built-in audio, 1080p output, and lip-sync in 8+ languages
Native Video and Audio Generation
HappyHorse 1.0 generates video and audio in one pass thanks to a unified 15B-parameter Transformer that processes text, image, video, and audio tokens together. Dialogue, ambient sounds, and Foley effects appear exactly in sync with the visuals — no post-production dubbing or separate audio tools needed.
Speaks 8+ Languages with Perfect Lip-Sync
The model natively supports English, Mandarin, Cantonese, Japanese, Korean, German, French, Spanish, and Indonesian. Lip movements are synced at the phoneme level, so characters actually articulate each word rather than generically moving their mouths. This works both with AI-generated speech and with your own uploaded voiceover.
Native 1080p at 8 Denoising Steps
HappyHorse 1.0 outputs 5–8 second clips at full 1080p in 16:9 or 9:16 aspect ratios. A distilled version of the model reduces the diffusion process to just 8 steps without classifier-free guidance, accelerated further by the in-house MagiCompiler runtime. The result is fast generation without sacrificing detail or resolution.
Open Source with Commercial License
HappyHorse 1.0 is fully open source under a commercial-use license. The release includes the base model, a distilled model, a super-resolution module, and inference code. You can self-host it, fine-tune it on your own data, or deploy it in production — no API dependency required.
What can you create with HappyHorse 1.0? Here are some ideas:
Viral Videos
Generate short-form clips with synchronized music and sound effects ready for TikTok, Reels, and Shorts — audio included from the start.
AI Films
Create cinematic scenes with dialogue, ambient audio, and camera work from a single text prompt. The unified architecture handles visuals and sound together.
YouTube Videos
Produce 1080p video content with narration and background audio for YouTube. Supports both 16:9 landscape and 9:16 vertical formats.
Talking Head Videos
Generate talking head videos with phoneme-level lip-sync in 8+ languages. Upload your own voice recording and an image to create a realistic speaking character.
Product Marketing
Turn product photos into polished video ads with auto-generated sound design. Describe the scene in your prompt and get a ready-to-use marketing clip.
AI Videos that Look Real
HappyHorse 1.0 accepts both text and image prompts, so you can feed in real photos of objects, places, or people and generate video that stays faithful to the source material.
Create AI videos in 3 simple steps
Describe Your Video
Write your prompt describing the scene you want. You can also upload a reference image to guide the visual style and composition.
AI Generates The Video
HappyHorse 1.0 generates your video with synchronized audio in one pass.
Download and use
Get your video ready to share, post, or integrate into your projects.
What is HappyHorse 1.0?
HappyHorse 1.0 is a 15-billion-parameter open-source video generation model developed by a team formerly from Alibaba. It generates video and synchronized audio together in a single pass using a unified Transformer architecture. The model ranks #1 globally on the Artificial Analysis Video Arena.
Does HappyHorse 1.0 generate audio with video?
Yes. HappyHorse 1.0 generates dialogue, ambient sounds, and Foley effects alongside the video in a single pass. The audio is synchronized at the phoneme level, so lip movements match the speech naturally. You can also upload your own voiceover or soundtrack instead.
Is HappyHorse 1.0 free to use?
HappyHorse 1.0 is available on Overchat AI with a free tier. You can generate videos without a subscription to try the model. For higher volume or priority generation, paid plans are available.
What resolution and length does HappyHorse 1.0 support?
HappyHorse 1.0 outputs native 1080p video in 16:9 and 9:16 aspect ratios. Clips are 5 to 8 seconds long. A distilled version of the model uses only 8 denoising steps, which speeds up generation without reducing visual quality. A super-resolution module is also included for upscaling.
What languages does HappyHorse 1.0 support?
HappyHorse 1.0 supports lip-synced speech generation in English, Mandarin, Cantonese, Japanese, Korean, German, French, Spanish, and Indonesian. Lip-sync is phoneme-level accurate across all supported languages.
Is HappyHorse 1.0 open source?
Yes. HappyHorse 1.0 is fully open source with a commercial-use license. The release includes the base model, a distilled model, a super-resolution module, and inference code. You can self-host, fine-tune, and deploy it on your own infrastructure.
