> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gengen.farm/llms.txt
> Use this file to discover all available pages before exploring further.

# Happy Horse 1.1

> Asynchronous Happy Horse 1.1 video generation with text-to-video, image-to-video, and reference-to-video modes.

Happy Horse 1.1 is exposed in GENGEN as one public video model with three modes: text\_to\_video, image\_first\_frame, and reference\_to\_video.

GENGEN maps the public model and selected mode to the provider-specific upstream model ID internally.

The model supports 720P and 1080P output, 3-15 second durations, optional watermarks, and reproducible seeds.

In GENGEN, Happy Horse uses the shared video task endpoint and returns `happyhorse11:<remote_id>` public task IDs.

## Model ID

```text theme={"dark"}
happyhorse-1.1
```

Pass this exact public ID in the top-level `model` field. Do not substitute an upstream provider alias.

## Supported modes

* `text_to_video`
* `image_first_frame`
* `reference_to_video`

## Inputs

* `Text`
* `Image`

## Outputs

* `Video`

## Capabilities

* `Text-to-video`
* `Image-to-video`
* `Reference-to-video`

### Additional capabilities

* `Text-to-video`
* `First-frame image-to-video`
* `Reference-to-video`
* `Aspect ratio control`
* `Seed control`

## Technical details

| Property          | Value                                             |
| ----------------- | ------------------------------------------------- |
| Provider          | `happyhorse`                                      |
| Modality          | `video`                                           |
| Processing        | `Asynchronous task`                               |
| Endpoint          | `/api/gengen/v1/contents/generations/tasks`       |
| Durations         | `3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15`     |
| Resolutions       | `720P, 1080P`                                     |
| Aspect ratios     | `16:9, 9:16, 1:1, 4:3, 3:4, 4:5, 5:4, 9:21, 21:9` |
| Audio generation  | `Not supported`                                   |
| Watermark control | `Not supported`                                   |

<Note>
  Availability and final customer prices can change. Check the [Dashboard model catalog](https://gengen.farm/dashboard?section=models) before production use.
</Note>

See the [API reference overview](/api-reference/introduction) for authentication, request conventions, and response schemas.