Veo 3.1

POST/v1/run

Veo3.1 Extend Video is Google's video-to-video AI model. Transform, enhance, and edit video content using text prompts - from style changes to object manipulation and scene modification.

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/extend-video.

Default: google/veo3.1/extend-video

stringpromptrequired

The text prompt describing how the video should be extended

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>video

URL of the video to extend. The video should be 720p or 1080p resolution in 16:9 or 9:16 aspect ratio.

Optional<string>resolution

The resolution of the generated video.

Default: 720p

Optional<integer>duration

The duration of the generated video.

Default: 7

Optional<boolean>generate_audio

Whether to generate audio for the video.

Default: true

Optional<integer>seed

The seed for the random number generator.

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: video-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/extend-video",
  "prompt": "Continue the scene naturally, maintaining the same style and motion.",
  "aspect_ratio": "21:9",
  "video": "https://static.sandbase.ai/examples/google/veo3.1/extend-video/input_video_0.mp4",
  "duration": 7
}'

# 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/extend-video",
  "status": "running",
  "outputs": []
}