How do the reference images work?

Supply them in order, then refer to them in the prompt as character1, character2, and so on. That is how you tell the model which reference belongs to which subject in a multi-subject scene.

How long can a clip be?

Between 3 and 15 seconds. Pick the duration before generating — it is one of the inputs that determines the credit cost.

Does it generate sound?

No. HappyHorse 1.1 produces picture only. If the piece needs synchronised audio, use a model with native audio generation instead.

AI Video Model

HappyHorse 1.1

Q: What is HappyHorse 1.1?

A video generation model aimed at physically realistic, fluid motion. It accepts three kinds of input — a text prompt, a single first-frame image, or 1 to 9 reference images — and outputs at 720p or 1080p.

Motion that obeys the physics of the scene

HappyHorse 1.1 generates video where things move as though they have mass. Start from a written scene, animate a first frame, or hand it up to nine reference images and compose a cast — at 720p or 1080p.

HappyHorse 1.1

Creative workspace

HappyHorse 1.1

What is HappyHorse 1.1?

HappyHorse 1.1 is a video generation model built for physical realism: it generates clips where weight, momentum, and contact behave the way they do in the world, from a text prompt, a first-frame image, or up to nine reference images.

How the people who built the model describe it:

“HappyHorse 1.1 generates physically realistic, fluid-motion video from text, a first-frame image, or 1~9 reference images.”

HappyHorse 1.1 on EvoLink

HappyHorse 1.1 at a glance

You bring: Text, a frame, or refs
Duration: 3–15 seconds
Output: 720P or 1080P

What you can make with the HappyHorse 1.1 tool

These are the jobs people actually bring to HappyHorse 1.1, and the settings each one needs.

Motion that has to look real

Falling, pouring, collisions, cloth, hair, water — the shots where an audience notices immediately when the physics are wrong.

A recurring cast

Give it up to nine reference images and address them in the prompt as character1, character2, and so on, so the same faces turn up across a series.

One frame you already like

Hand it a still you have already composed and let the motion grow out of that frame rather than starting the look from scratch.

HappyHorse 1.1

What HappyHorse 1.1 does

Three ways in, one model behind them. What changes between them is how much of the look you decide up front.

Physical realism, not just smoothness

A clip can be perfectly smooth and still look wrong, because the weight is off. HappyHorse is tuned for the other thing: momentum that carries, contact that lands, motion that settles the way mass settles.

Write it, and it moves

Describe the scene, the motion, and the mood in plain language. Nothing to upload — useful when the shot only exists in your head and you want to see it before committing to art direction.

Animate a frame you already have

Give it a first frame and the composition, the subject, and the lighting all survive into the clip. You are directing what happens next, not renegotiating what the shot looks like.

Cast a scene from references

Up to nine ordered reference images, called out in the prompt as character1, character2, and so on. It is how you keep several specific subjects recognisable in the same shot instead of hoping the model guesses.

HappyHorse 1.1

Choose with context

Where HappyHorse 1.1 is the right call, and where a different model does the job better.

Input routes

Text, first frame, or 1–9 reference images

Resolution

720P and 1080P

Native audio

Not generated — pair with a model that does if you need sound

Best decision signal

The shot lives or dies on whether the motion looks physically right

From brief to studio in three steps

Set the creative anchor

Write the idea and add any source or reference material the tool needs.

Shape the output

Choose the model, format, resolution, and duration that match delivery.

Continue in Studio

Review the complete draft in the shared conversation flow. Generation will be enabled when the model API is connected.

HappyHorse 1.1 questions

Start Creating With HappyHorse 1.1

Set up the brief now, then continue in the shared Studio workspace.

Open the workspace View pricing