Question 1

What is Happy Horse?

Accepted Answer

Happy Horse 1.0 is a 15B-parameter open-source unified Transformer that generates cinematic 1080p video with synchronized audio in a single pass. Ranked #1 on Artificial Analysis Arena for both Text-to-Video and Image-to-Video.

Question 2

What input types are supported?

Accepted Answer

Happy Horse supports Text-to-Video and Image-to-Video with multiple aspect ratios: 16:9, 9:16, 4:3, 3:4, 21:9, and 1:1.

Question 3

Does Happy Horse generate audio?

Accepted Answer

Yes! Happy Horse jointly generates video and audio in a single pass. Dialogue aligns to lip movements, footsteps land on the right frame, and ambient sound responds to camera cuts.

Question 4

What languages does lip-sync support?

Accepted Answer

Happy Horse supports 7 languages: English, Mandarin, Cantonese, Japanese, Korean, German, and French with industry-leading low Word Error Rate.

Question 5

Is Happy Horse open-source?

Accepted Answer

Yes! Fully open-source with commercial-use rights including base model, distilled model, super-resolution module, and inference code.

Question 6

What video quality and duration?

Accepted Answer

Native 1080p HD (up to 2K with super-resolution), 5-10 second clips. A 5-second 1080p clip generates in ~38 seconds on H100.

Happy Horse AI Video Generator

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