A 2D generative video model from Alibaba's ATH Innovation Division, sibling to the Happy Oyster world model.

How is Happy Horse different from Happy Oyster?

Happy Horse outputs flat video clips you watch. Happy Oyster outputs 3D worlds you can re-enter and explore.

Can I use Happy Horse today?

Yes, public access is available via tryhappyhorse.xyz; pricing tiers are still being finalized.

Alibaba ATH Innovation Division vs Runway AI, Inc.

Happy Horse vs Runway Gen-4.5

Happy Horse (2D-first generative video model) compared to Runway Gen-4.5 (A new frontier for video and world simulation.).

Happy Horse and Runway Gen-4.5 target adjacent jobs but take different approaches. This page compares them side by side on output paradigm, access, capabilities, and positioning — based on vendor-stated claims as of 2026-04-20 / 2026-04-21.

At a Glance

Alibaba ATH Innovation Division

Happy Horse

2D-first generative video model

Same Alibaba ATH lineage as Happy Oyster, but optimized for flat-video output
Image-to-video with motion-control on top, not just text-to-video
Public access already open, ahead of Happy Oyster's general availability

See Happy Horse details →

Runway AI, Inc.

Runway Gen-4.5

A new frontier for video and world simulation.

Built on GWM-1, an advanced General World Model architecture that intrinsically understands and simulates real-world physics.
Offers infinite character and object consistency across multiple angles and scenes using only a single reference image.
Provides an integrated node-based workflow system that lets users chain multiple AI models and modalities directly within the web interface.

See Runway Gen-4.5 details →

How They Compare

Dimension	Happy Horse	Runway Gen-4.5
Modality	text-to-video, image-to-video	text-to-video, image-to-video, video-to-video, text-to-audio
Release status	public (2026-03-10)	ga (2025-12-11)
Capabilities	Text to Video · Image to Video · Motion Control · Multi-shot Continuity	Character Consistency · Physics Simulation · Cinematic Camera Control · Video to Video
Output type	2D video clips	—
Max clip length	Not officially documented	—
Resolutions	720p / 1080p tiers reported	—
API	Public access via tryhappyhorse.xyz	—
Pricing	Tiered, details not finalized	—
Max Resolution	—	4K (via built-in upscale)
Max Duration	—	Up to 34 seconds (via extend tool)
Architecture	—	GWM-1 (General World Model)

Which Should You Choose?

Pick Happy Horse if you need: Same Alibaba ATH lineage as Happy Oyster, but optimized for flat-video output.
Pick Runway Gen-4.5 if you need: Built on GWM-1, an advanced General World Model architecture that intrinsically understands and simulates real-world physics..
Both come from different vendors — consider your existing stack.