HappyHorse 1.1

HappyHorse 1.1 is Alibaba Cloud Model Studio’s video-generation series. Choose the workflow that matches your input: text only, one first-frame image, or multiple reference images. All workflows submit an asynchronous task through POST /v1/video/generations.

T2V means text-to-video, I2V means image-to-video, and R2V means reference-to-video. Save the returned task ID and poll the task query guide until the task completes.

Key capabilities

Synchronized audio - All HappyHorse 1.1 workflows generate 24 fps MP4 video with audio
Resolution - 720P or 1080P
Duration - An integer from 3 to 15 seconds
Seed and watermark controls - Set a seed for reproducibility and control the HappyHorse watermark

Text to video
Image to video
Reference to video

Use happyhorse-1.1-t2v to generate a video from a text prompt.

cURL

curl https://www.anyfast.ai/v1/video/generations \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "happyhorse-1.1-t2v",
    "input": {"prompt": "A miniature cardboard city wakes up at night as a lit train passes by."},
    "parameters": {"resolution": "720P", "ratio": "16:9", "duration": 5, "watermark": false, "seed": 42}
  }'

Parameter	Required	Description
`input.prompt`	Yes	Text description; up to 5,000 non-Chinese or 2,500 Chinese characters
`parameters.ratio`	No	`16:9`, `9:16`, `1:1`, `4:3`, `3:4`, `4:5`, `5:4`, `9:21`, or `21:9`; default `16:9`
`parameters.resolution`	No	`720P` or `1080P`; default `1080P`

Use happyhorse-1.1-i2v with exactly one first_frame image. Images can be public HTTP/HTTPS URLs or Base64 data URLs in JPEG, JPG, PNG, or WEBP format. Each side must be at least 300 pixels, the aspect ratio must be between 1:2.5 and 2.5:1, and the file must not exceed 20 MB.

cURL

curl https://www.anyfast.ai/v1/video/generations \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "happyhorse-1.1-i2v",
    "input": {"prompt": "The cat runs across the grass as the camera follows smoothly.", "media": [{"type": "first_frame", "url": "https://example.com/cat.png"}]},
    "parameters": {"resolution": "720P", "duration": 5, "watermark": false}
  }'

The I2V workflow does not accept parameters.ratio; the output follows the first-frame image ratio.

Use happyhorse-1.1-r2v with 1 to 9 reference_image items. Reference images may be public URLs or Base64 data URLs in JPEG, JPG, PNG, or WEBP format. The shortest side must be at least 400 pixels and each file must not exceed 20 MB.

cURL

curl https://www.anyfast.ai/v1/video/generations \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "happyhorse-1.1-r2v",
    "input": {"prompt": "The woman in [Image 1] enters the room and opens the folding fan from [Image 2].", "media": [{"type": "reference_image", "url": "https://example.com/person.jpg"}, {"type": "reference_image", "url": "https://example.com/fan.jpg"}]},
    "parameters": {"resolution": "720P", "ratio": "16:9", "duration": 5, "watermark": false}
  }'

The order of input.media determines [Image 1], [Image 2], and so on in the prompt.

Shared parameters

Parameter	Type	Description
`parameters.duration`	integer	3-15 seconds; default `5`
`parameters.watermark`	boolean	Whether to add the HappyHorse watermark; default `true`
`parameters.seed`	integer	Random seed in `[0, 2147483647]`

Getting started

Model Introduction

Resources

Key capabilities

Shared parameters

API reference

Task query

Official references

​Key capabilities

​Shared parameters

API reference

Task query

​Official references

Key capabilities

Shared parameters

Official references