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/VIDEO/Veo 3.1/veo3.1-fast
Video
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Veo 3.1 Fast API

Generate video quickly from text or reference images with resolution controls.

  • Text to video
  • Image to video
Try modelGet API KeyDocumentation

Starting at

$0.2

per generation

83% cheaper than fal.ai · 8-sec clip
5 parameters · 3 price options

Veo 3.1 Fast playground

Input

User's prompt

Image URLs for video generation

Sign in to run

Runs are charged to your balance.

Output

Output will appear here.

Fill in the fields, review the cost and run the model. Your result will appear here; you do not need a separate API key to try it in your browser.

Veo 3.1 Fast API pricing

OptionPrice per generationfal.ai · 8-sec clipYour savings
1080p$0.2$1.2−83%
720p$0.2$1.2−83%
4k$0.429——

Quick start

Full API reference →
1curl -X POST https://api.api-stock.com/api/v1/generation/create \
2  -H "Authorization: Bearer $API_STOCK_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{
5    "model": "veo3.1-fast",
6    "input": {
7      "prompt": "A cinematic shot of a city at dusk",
8      "aspectRatio": "16:9",
9      "resolution": "1080p"
10    }
11  }'

Parameters

NameTypeRequiredDefaultDescription
promptstringYes—User's prompt
aspectRatiostringNo16:9Aspect ratioOne of: 16:9, 9:16
urlsstring[]No—Image URLs for video generation
resolutionstringNo1080pVideo resolution qualityOne of: 720p, 1080p, 4k
generationTypestringNo—Generation type for VEO3 modelOne of: frame, reference

Frequently asked questions

How much does Veo 3.1 Fast cost?

Veo 3.1 Fast starts at $0.2 per generation through the API Stock API. You pay per use from a single prepaid balance — there is no subscription — and the final price scales with parameters such as resolution or duration.

When was Veo 3.1 Fast released?

Veo 3.1 Fast was released on October 15, 2025. It is available through the API Stock API with the same key and prepaid balance as every other model.

How do I get an API key for Veo 3.1 Fast?

Sign up for API Stock, top up your balance using an available payment method and create an API key in the dashboard — it takes a couple of minutes and needs no contract. The same key works with every model in the catalog, so there is no separate key to obtain for Veo 3.1 Fast.

How do I call the Veo 3.1 Fast API?

Send a POST request to https://api.api-stock.com/api/v1/generation/create with your API key and the model id "veo3.1-fast". The call returns a task id you poll, or a webhook callback when the result is ready. A ready-to-run example is in the quick start above.

What input parameters does Veo 3.1 Fast accept?

Veo 3.1 Fast accepts 5 input parameters, including the required field(s) prompt. Their types, defaults and allowed values are listed in the parameters table above.

What happens if a Veo 3.1 Fast request fails?

API Stock automatically retries the request on a reserve provider. If every provider fails, the charge is refunded to your balance.

Can I use Veo 3.1 Fast with the same API key as other models?

Yes. Every model on API Stock — video, image, music and chat — shares one API key and one prepaid balance, so you can switch to Veo 3.1 Fast without new credentials.

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