Veo 3.1 Fast

Name: Veo 3.1 Fast
Author: Google

google/veo3.1/fast/reference-to-video

Veo3.1 Fast by Google - animate still images into dynamic videos with AI. Transform photos into cinematic clips with natural motion, camera movement, and optional audio generation.

Use in agent Get API key

Base price: $1.20USD / run
Execution: async
Model type: video
Input fields: 6

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Playground

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Input

Prompt(string)

The text prompt describing the video you want to generate

Image URL or upload(array)

Upload

PNG, JPEG, WebP, or GIF · 20 MiB maximum each

URLs of the reference images to use for consistent subject appearance

Resolution(string)

The resolution of the generated video. Allowed values: 720p, 1080p, 4k.

Duration(integer)

The duration of the generated video.

Generate Audio(boolean)

Whether to generate audio for the video.

Aspect Ratio(string)

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.

OutputReady

Your output will appear here

Complete the inputs, then click Run.

Specifications

Pricing

Base price: $1.20 / run
Billing formula: params.resolution == "4k" ? (params.generate_audio ? params.duration * 0.35 : params.duration * 0.30) : (params.generate_audio ? params.duration * 0.15 : params.duration * 0.10)

Context & modalities

Input: Schema-defined
Output: video

Capabilities

Chat: Not supported
Vision: Not supported
Reasoning: Not supported
Structured output: Not supported
Function calling: Not supported
Audio input: Not supported

Access

Provider: Google
Model ID: google/veo3.1/fast/reference-to-video
Execution: async
API: Unified Run API
Endpoint: /v1/run

API README

Veo 3.1 Fast

google/veo3.1/fast/reference-to-video uses multiple visual references to establish characters, objects, environments, or style in a newly generated video. Veo 3.1 improves instruction following, physical consistency, character continuity, and audiovisual quality while supporting more ways to anchor or continue a shot. This combination makes the model a practical choice when the creative outcome depends on those qualities rather than on a generic media conversion.

For production work with google/veo3.1/fast/reference-to-video, this Fast reference-guided generation workflow prioritizes turnaround for concept comparison, previsualization, social creative, and high-volume variation before a final direction is selected. The result is most reliable when the source material and creative brief clearly describe the intended subject, progression, visual or sonic character, and the qualities that must remain unchanged.

Highlights

Multi-reference understanding carries supplied identities, objects, and style into a coherent moving scene.

Improved physical coherence strengthens object interactions, character movement, and cause-and-effect across shots.

Fast creative iteration produces cinematic alternatives more quickly for review and selection.

Native audio generation coordinates dialogue, ambience, and sound effects with the visual action.

Pricing

Resolution	Audio off, per second	Audio on, per second
720p or 1080p	$0.100	$0.150
4K	$0.300	$0.350

When to Use

✅ Good fit	❌ Consider alternatives
The model's named workflow matches the source material and intended output	A different input modality or model route is required
A managed asynchronous result is suitable for the production pipeline	A synchronous, interactive editor is essential
The documented controls cover the required duration, framing, or format	The project needs controls outside this endpoint's schema
Creative iteration benefits from a repeatable request structure	Exact deterministic pixels, frames, geometry, or samples are mandatory
A finished downloadable media asset is the desired deliverable	Editable source layers or a native project file are required

Prompt Guide

For generation, state the intended result first, then add the subject or source treatment, progression, style, and delivery constraints. Keep one creative variable per phrase, use the documented field names for controls, and change one setting at a time when comparing results.

{
  "aspect_ratio": "21:9",
  "duration": 8,
  "images": [
    "https://static.sandbase.ai/examples/google/veo3.1/fast/reference-to-video/input_images_0.png"
  ],
  "prompt": "A chimpanzee wearing overalls frolics in the grassy field, gently playing with the butterflies. In the background, a circus tent and carousel beckon.",
  "resolution": "720p"
}

Technical Specs

Spec	Value
Model ID	`google/veo3.1/fast/reference-to-video`
Inputs	aspect_ratio, duration, generate_audio, images, prompt, resolution
Required inputs	prompt
Output fields	content_type, url
Execution	Async (submit, then poll for result)
Resolution	720p / 1080p / 4k
Aspect Ratio	21:9 / 16:9 / 3:2 / 4:3 / 5:4 / 1:1 / 4:5 / 3:4 / 2:3 / 9:16

Related Models

Start building

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

Production API

Unified Run API endpoint

https://api.sandbase.ai/v1/run

Model ID

google/veo3.1/fast/reference-to-video

# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/run" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "google/veo3.1/fast/reference-to-video",
  "images": [
    "https://static.sandbase.ai/examples/google/veo3.1/fast/reference-to-video/input_images_0.png",
    "https://static.sandbase.ai/examples/google/veo3.1/fast/reference-to-video/input_images_1.png",
    "https://static.sandbase.ai/examples/google/veo3.1/fast/reference-to-video/input_images_2.png"
  ],
  "prompt": "A chimpanzee wearing overalls frolics in the grassy field, gently playing with the butterflies. In the background, a circus tent and carousel beckon.",
  "duration": 8,
  "resolution": "720p",
  "generate_audio": true
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
  status=$(printf '%s' "$result" | jq -r .status)
  case "$status" in completed|failed|timeout) break ;; esac
  sleep 2
  result=$(curl --fail-with-body --silent \
    -H "Authorization: Bearer $SANDBASE_API_KEY" \
    "https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"

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