Veo 3.1 Fast
GoogleAvailableVeo 3.1 Fast from Google: cinematic 4 to 8 second video with synchronized audio, tuned for speed. Text to video or first and last frame, 720p or 1080p.
- Text → video
- Image → video
- Native audio
720p
390 cr / video
$0.390
1080p
425 cr / video
$0.425
- Queued
- Processing
- Succeeded
What Veo 3.1 Fast is good for
Finished clips with sound
Every output includes synchronized audio, which suits short ads and social clips.
Final renders
Test a prompt on Veo 3.1 Lite, then send the same input here by changing the model id.
Scenes between two frames
Set a first and last frame to control how a shot opens and closes, at 720p or 1080p.
Input parameters
JSON Schema| Name | Type | Default | Description |
|---|---|---|---|
| prompt (required) | string | — | What happens in the shot, including motion and sound. Up to 5,000 characters. |
| image_urls | string[] | — | First frame, and optionally last frame, as public HTTPS URLs. |
| duration | integer | 8 | Clip length in seconds. One of 4, 6, 8. |
| resolution | enum | "720p" | Output resolution. One of 720p, 1080p. Sets the price. |
| aspect_ratio | enum | "16:9" | Output aspect ratio. One of 16:9, 9:16, auto. |
Fields of the input object. Unknown fields are rejected with 400 invalid_request.
curl -X POST https://genkiln.com/v1/tasks \
-H "Authorization: Bearer $GENKILN_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $(uuidgen)" \
-d '{
"model": "veo-3.1-fast",
"input": {
"prompt": "A red fox trotting through fresh snow at dawn, low tracking shot, soft breath vapor",
"duration": 8,
"resolution": "720p",
"aspect_ratio": "16:9"
}
}'
# 202 Accepted -> { "id": "task_...", "status": "queued", "cost_credits": ... }
curl https://genkiln.com/v1/tasks/task_... \
-H "Authorization: Bearer $GENKILN_API_KEY"The samples use the values in the Playground form. Create a task, then poll it until it is final, or add callback_url to get a signed webhook.
Veo 3.1 Fast API pricing
| Variant | Credits | USD | 10 clips |
|---|---|---|---|
| 720p | 390 | $0.390 | $3.900 |
| 1080p | 425 | $0.425 | $4.250 |
The cost is set by the parameters you send and returned as cost_credits when the task is created. 1 credit = US$0.001. Buy credits
Veo 3.1 Fast questions
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