Documentation Index
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Fluid, lifelike motion from Alibaba
Happy Horse is Alibaba’s best video model, engineered specifically for natural, physics-consistent motion. It generates videos up to 15 seconds long at resolutions between 720p and 1080p, with native audio output — dialogue, ambient sound, and environmental effects — generated alongside the video in a single pass. The model excels at scenes requiring believable organic movement: human motion, natural environments, animals, and fluid dynamics all render with a level of realism that makes the output feel grounded rather than synthetic. Native audio completes the picture by matching the generated soundscape to the visual content without post-processing.Capabilities
Fluid, lifelike motion
Engineered for natural movement — human motion, environmental dynamics, and organic subjects render with realistic physics and consistent body mechanics.
Native audio generation
Generates audio alongside video in a single pass — ambient sound, environmental effects, and dialogue without requiring separate post-processing.
Up to 1080p output
Selectable resolution between 720p and 1080p for flexible delivery across social, web, and production pipelines.
Up to 15 seconds
Generate clips from 3 to 15 seconds — enough length for full narrative beats, product demonstrations, or scene-level storytelling.
Start frame input
Provide a reference image as the opening frame to anchor the model’s visual output to a specific subject, composition, or environment.
Scene-level realism
Handles complex visual scenes — crowd motion, environmental weather, lighting changes — with temporal consistency across the full clip.
Specifications
| Feature | Details |
|---|---|
| Developer | Alibaba |
| Resolution | 720p–1080p |
| Duration | 3–15 seconds |
| Audio | Native audio generation |
| Input | Start frame (image-to-video) |
| Base credits | 252 |
How to use
Upload your start frame (optional)
Upload an image to anchor the opening composition. If skipped, the model generates from the text prompt alone.
Write your prompt
Describe the scene, motion, atmosphere, and any audio direction. Be specific about how subjects and the environment should move.
Prompting tips
- Describe motion specifically — Happy Horse rewards precise motion language. “The subject walks slowly across the frame” produces more consistent results than “someone moving.”
- Include audio direction — Since audio is generated natively, describe what you want to hear: “light rain on pavement,” “crowd murmur in background,” or “ambient wind.”
- Use the start frame for subject anchoring — If your scene has a specific character or environment, upload a reference image. The model will maintain its appearance throughout the clip.
- Match duration to content — Simple motion reads well at 3–5 seconds. Multi-beat scenes or longer narratives benefit from 8–15 seconds.
Example prompts
A woman walks through a sunlit park in slow motion, leaves drifting around her. Soft ambient birdsong and gentle wind. 1080p, 10 seconds.
A tiger moves through tall grass at dusk, each step deliberate. Low ambient hum of insects, distant thunder. Wide shot. 15 seconds.
Ocean waves crash against rocky cliffs at golden hour. Spray catches the light. Deep resonant sound of water against stone. 8 seconds.
Compare models
| Model | Resolution | Audio | Duration | Best for |
|---|---|---|---|---|
| Happy Horse | 720p–1080p | Yes | 3–15s | Fluid lifelike motion with native audio |
| Wan 2.6 | 720p–1080p | Yes | 5–15s | Character reference-to-video, R2V |
| Wan 2.5 | 480p–1080p | Yes | 5–10s | Audio-visual sync, lip-sync |
| Kling 3.0 Pro | 1080p | Yes | 3–15s | Multi-shot storytelling, 60 FPS |
| Seedance 2 | 720p–1080p | Yes | 4–15s | Multimodal references, full production |