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Google Veo 31 Fast

veo_31_fast

Google Veo 3.1 Fast video generation via Vertex AI. Optimized for faster processing speed while maintaining high-quality output. Supports text-to-video and image-to-video generation with competitive pricing.

Authentication

authorization string required

All APIs require authentication via Bearer Token.

Get API Key:

Visit API Key Management Page to get your API Key.

Usage:

Add to request header:

Authorization: Bearer YOUR_API_KEY

Parameters

model string required

Model ID to use for the request.

Value: veo_31_fast

prompt string required

Text description for the generated video, audio prompts are supported

negativePrompt string

Text describing what should not appear in the generated video

image object

Initial image used for animation generation

lastFrame object

Final image that interpolation should transition to

Must be used together with image

referenceImages array

Up to 3 images used as style/content references

Type: VideoGenerationReferenceImage[]

Only available for Veo 3.1 series

video object

Video object used for video extension/add-on scenarios

Type: previous-generation Video object

aspectRatio string

Video aspect ratio

Options: 16:9, 9:16

Default: 16:9

resolution string

Video resolution

Options: 720p, 1080p, 4k

1080p and 4k are only supported when durationSeconds is 8.

720p only applies to extension service scenarios.

durationSeconds integer

Generated video duration in seconds

Options: 4, 6, 8

When using extension, reference images, 1080p, or 4k, this must be 8.

personGeneration string

Controls person generation behavior
Text-to-video and extension only support allow_all
Image-to-video, interpolation, and reference image flows only support allow_adult

Polling

Since result generation takes time, you need to poll the task status after creating the task.

The initial response only returns information such as the task ID and initial status. The final result must be obtained by polling the task status endpoint using the task ID.

See the examples on the right for polling requests and responses.

Response Format

error object

Error details. Present when status is failed.

code integer

Error code.

error_message string

Detailed error message.

output array

Generation results. Present when status is completed.

content array

Generated resource list.

type string

Resource type.

Value: video

url string

Output URL.

jobId string

Remote job ID.

usage object

Usage statistics. Present when status is completed.

cost string

Total cost in USD.

discount number

Discount amount.

input_tokens integer

Number of input tokens.

output_tokens integer

Number of output tokens.

total_tokens integer

Total number of tokens.

metadata object

Metadata information.