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AlibabaVideo

HappyHorse 1.1

Native audio with multilingual lip sync, written straight into the prompt.

video/happy-horse-1.1
Try it in StudioUse with your agent or API

She draws the katana in one fluid motion and spins into a slow-motion sweeping cut; rain droplets burst away from the blade and her hair and sash swirl; she finishes in a poised stance as the camera circles slowly around her. One continuous shot, no cuts, consistent character, correct anatomy and hands, no text, no logos, no captions.

Price
14 credits / second
Makes
Text to video, Image to video, Reference to video
Clip length
3 to 15 s

Best for

HappyHorse 1.1 is an Alibaba video model with synchronized native audio and multilingual lip sync, so spoken lines can go straight into the prompt. It placed in the top ten for both text to video and image to video on the Artificial Analysis video arena in September 2026. In Summer it renders 720p clips from a prompt, a still or up to nine reference images.

  • Talking NPC and narrator clips with lines written in the prompt.
  • Character intros for trailers in several languages.
  • Animating a portrait that speaks one line of dialogue.

Put it together

Where HappyHorse 1.1 fits in a game, with the models it works well with. Your agent runs every step.

Price

ModeModelPrice
Text to videoHappyHorse 1.114 credits / second
Image to videoHappyHorse 1.114 credits / second
Reference to videoHappyHorse 1.1 References14 credits / second

Paid from your Summer credits.

Use it from code or your agent

Sign in once with summer login. Your agent or your code then runs it with your paid credits.

npx -y summer-engine@latest login
npx -y summer-engine@latest api run video/happy-horse-1.1 \
  --input '{"prompt":"a dragon circling a castle at dawn","duration":5}' \
  --download .

video/happy-horse-1.1: $0.14 per second of video. Paid from your Summer credits.

Inputs

What input takes for video/happy-horse-1.1. Send only what you need; Summer fills in tested defaults.

  • promptstringup to 4000 characters

    What happens in the clip. Needed without imageUrl.

  • imageUrlstringup to 2048 characters

    A public image URL to animate (image to video).

  • endImageUrlstringup to 2048 characters

    With imageUrl: the last frame. The same image as imageUrl makes a seamless loop. Models with an end frame: Seedance, Kling 3, Wan, Vidu, LTX 2.5, Luma, MiniMax.

  • referenceImageUrlsarray of string1 to 10 items

    Reference to video: public images of the characters, props or style to keep (with a reference model, e.g. kling-4-ref). Motion transfer: the character to move.

  • videoUrlstringup to 2048 characters

    An input clip (public URL, at most 20 s): restyle or reframe it, move a character with its motion, or add sound to it (e.g. kling-video-to-audio). Billed on the clip's length.

  • durationintegerDefault 5 · 1 to 20

    Seconds; the model renders its nearest supported length.

  • aspectRatioenumDefault 16:9
    • 16:9
    • 9:16
    • 1:1
    • 4:3
    • 3:4
    • 21:9
    • 3:2
    • 2:3
    • auto
  • negativePromptstringup to 1000 characters

    What the clip must not show.

  • resolutionenum

    Only a quality the model offers; leave out for its default.

    • 720p
    • 1080p
    • 4k
    • 480p
    • 768p
    • 2k
    • 768P
    • 1080P
    • 480P

Model docs · Summer API docs · Set up the Summer MCP server · Try it in the browser

Questions

What is HappyHorse 1.1 good for in game development?
HappyHorse 1.1 is an Alibaba video model with synchronized native audio and multilingual lip sync, so spoken lines can go straight into the prompt. It placed in the top ten for both text to video and image to video on the Artificial Analysis video arena in September 2026. In Summer it renders 720p clips from a prompt, a still or up to nine reference images. Typical game uses: talking NPC and narrator clips with lines written in the prompt; character intros for trailers in several languages; animating a portrait that speaks one line of dialogue.
How much does HappyHorse 1.1 cost in Summer?
In Summer Studio: HappyHorse 1.1 (text to video): 14 credits / second; HappyHorse 1.1 (image to video): 14 credits / second; HappyHorse 1.1 References (reference to video): 14 credits / second. It is charged from your Summer credits.
What can HappyHorse 1.1 generate, and how long are the clips?
In Summer, HappyHorse 1.1 supports text to video, image to video, and reference to video. Generated clips run 3, 5, 8, 10, and 15 seconds, in 16:9, 9:16, 1:1, 4:3, 3:4, and 21:9 aspect ratios at 720p and 1080p.
Can I use HappyHorse 1.1 from Claude Code, Cursor or Codex?
Yes. Connect the Summer MCP server to Claude Code, Cursor, Codex or another MCP client, then ask your agent to generate with summer_generate_video with model: "happy-horse-1.1". Setup instructions are at summerengine.com/mcp.
Where do HappyHorse 1.1 results go?
Every generation is saved to your Summer asset library. From there you can download it or bring it into a Summer Engine project.