HappyHorse

Adding sound to AI video usually means a second tool and a cleanup pass. HappyHorse skips that step.

It is an open-source AI video generator that produces 1080p video and synchronized audio together in a single pass, from either a text prompt or a still image.

Under the hood, a 40-layer Transformer handles text, video and audio tokens at the same time, so no separate audio post-processing is needed.

Lip-sync is built in and covers 7 languages.

Distillation with DMD-2 brings generation down to 8 inference steps, which keeps single-GPU deployment realistic if you want to run the model yourself.

HappyHorse is also listed at #1 on the Artificial Analysis Arena for performance and prompt adherence, a ranking worth checking against your own prompts.