Wan-2.1 First-Last-Frame-to-Video

POST/v1/run

Wan 2.1 Flf To Video by Alibaba - animate still images into dynamic videos with AI. Transform photos into cinematic clips with natural motion, camera movement, and optional audio generation.

Request body

Submit an async generation request. The model field selects the model; other fields are model-specific input parameters.

stringmodelrequired

Model identifier. Set to alibaba/wan/2.1/flf-to-video.

Default: alibaba/wan/2.1/flf-to-video

stringpromptrequired

The text prompt to guide video generation.

stringimagerequired

URL of the starting image. If the input image does not match the chosen aspect ratio, it is resized and center cropped.

Optional<string>end_image

URL of the ending image. If the input image does not match the chosen aspect ratio, it is resized and center cropped.

Optional<string>resolution

Resolution of the generated video (480p or 720p). 480p is 0.5 billing units, and 720p is 1 billing unit.

Allowed values: 480p, 720p

Default: 720p

Optional<number>guide_scale

Classifier-free guidance scale. Higher values give better adherence to the prompt but may decrease quality.

Range: 1 to 10

Default: 5

Optional<string>aspect_ratio

The aspect ratio of the generated image.

Allowed values: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16

Optional<integer>seed

Random seed for reproducibility. If None, a random seed is chosen.

Response Schema

The submit endpoint returns an accepted generation task. Poll the result endpoint with the returned id for terminal outputs or errors.

Optional<string>error

Error message if the task failed. Empty on success.

stringidrequired

Unique identifier for the generation task.

Optional<string>model

Model ID used for the prediction.

Optional<array>outputs

Array of generated content. Empty when status is not completed.

stringstatusrequired

Status of the task: pending, running, completed, failed, or timeout.

Allowed values: pending, running, completed, failed, timeout

Model capabilities

array<string>capability_tagsrequired

Capabilities declared by the model registry.

Default: image-to-video

stringexecution_moderequired

Execution mode declared by the model registry.

Default: async

# 1. Submit a generation request
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "alibaba/wan/2.1/flf-to-video",
  "prompt": "A tabby cat is confidely strolling toward the camera, when it spins and with a flash of magic reveals itself to be a cat-dragon hybrid with glistening amber scales.",
  "image": "https://static.sandbase.ai/examples/alibaba/wan/2.1/flf-to-video/input_image_0.png",
  "aspect_ratio": "21:9"
}'

# 2. If the response is still running, poll the returned id
curl https://api.sandbase.ai/v1/run/run_abc123 \
  -H "Authorization: Bearer $SANDBASE_API_KEY"

Response202 Accepted

{
  "id": "run_abc123",
  "model": "alibaba/wan/2.1/flf-to-video",
  "status": "running",
  "outputs": []
}