Veo 3.1 Fast

POST/v1/run

Veo3.1 Fast First Last Frame To Video is Google's image-to-video AI model. Bring static images to life with fluid animation, consistent character motion, and professional-grade video output.

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 google/veo3.1/fast/first-last-frame-to-video.

Default: google/veo3.1/fast/first-last-frame-to-video

stringpromptrequired

The text prompt describing the video you want to generate

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<string>resolution

The resolution of the generated video.

Allowed values: 720p, 1080p, 4k

Default: 720p

Optional<integer>duration

The duration of the generated video.

Allowed values: 4, 6, 8

Default: 8

Optional<boolean>generate_audio

Whether to generate audio for the video.

Default: true

Optional<integer>seed

The seed for the random number generator.

Optional<string>first_frame_url

URL of the first frame of the video

Optional<string>last_frame_url

URL of the last frame of the video

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": "google/veo3.1/fast/first-last-frame-to-video",
  "prompt": "A woman looks into the camera, breathes in, then exclaims energetically, \"have you guys checked out Veo3.1 First-Last-Frame-to-Video on Fal? It's incredible!\"",
  "aspect_ratio": "21:9",
  "duration": 8
}'

# 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": "google/veo3.1/fast/first-last-frame-to-video",
  "status": "running",
  "outputs": []
}