Use Veo 3.1 Fast Generate 001 with Comfy Router

API Reference for veo/veo-3.1-fast-generate-001, served by Comfy Router from Veo.

Quick start

Create a key at platform.comfy.org/profile/api-keys and export it as COMFY_API_KEY. The Python and TypeScript snippets use the Comfy SDKs (pip install comfy-sdk, npm install @comfyorg/sdk); the cURL snippet is the same call over raw HTTP. Model ID: veo/veo-3.1-fast-generate-001 Endpoint: POST https://api.comfy.org/v2/models/veo/veo-3.1-fast-generate-001

from comfy_sdk import Comfy

# Reads COMFY_API_KEY from the environment. Each call sends a fresh
# Idempotency-Key and waits up to 10 minutes for the finished result.
with Comfy() as client:
    result = client.models.run(
        "veo/veo-3.1-fast-generate-001",
        {
            "instances": [
                {
                    "prompt": "a single red maple leaf falling onto still water, slow motion",
                },
            ],
            "parameters": {
                "durationSeconds": 4,
                "generateAudio": False,
                "sampleCount": 1,
            },
        },
    )

print(result)

import { comfy } from "@comfyorg/sdk";

// Reads COMFY_API_KEY from the environment. Each call sends a fresh
// Idempotency-Key and waits up to 10 minutes for the finished result.
const { data } = await comfy.models.run("veo/veo-3.1-fast-generate-001", {
  instances: [
    {
      prompt: "a single red maple leaf falling onto still water, slow motion",
    },
  ],
  parameters: {
    durationSeconds: 4,
    generateAudio: false,
    sampleCount: 1,
  },
});

console.log(data);

curl https://api.comfy.org/v2/models/veo/veo-3.1-fast-generate-001 \
  -H "X-API-Key: $COMFY_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d "{\"instances\": [{\"prompt\":\"a single red maple leaf falling onto still water, slow motion\"}], \"parameters\": {\"durationSeconds\":4,\"generateAudio\":false,\"sampleCount\":1}}"

Schema

Input

object[]

string

Camera motion type. Requires image to be provided.Possible values: fixed, pan_left, pan_right, tilt_up, tilt_down, truck_left, truck_right, pedestal_up, pedestal_down, push_in, pull_out

object | object

Optional first frame image to guide video generation

string (byte)

Base64-encoded image dataFormat: byte

string

Cloud Storage URI of the image

string

MIME type of the image (image/jpeg or image/png)Possible values: image/jpeg, image/png

object | object

Optional last frame image. Used with image to generate video between first and last frames. Supported by Veo 3.0+ models.

string (byte)

Base64-encoded image dataFormat: byte

string

Cloud Storage URI of the image

string

MIME type of the image (image/jpeg or image/png)Possible values: image/jpeg, image/png

object | object

Optional mask for video editing. Applies to input video.

string (byte)

Base64-encoded mask bytesFormat: byte

string

Cloud Storage URI to mask file

string

How the mask is appliedPossible values: insert, remove, remove_static, outpaint

string

MIME type of the mask (image/png, image/jpeg, image/webp, or video formats)

string

required

Text description of the video to generate

object[]

Optional reference images to guide video generation. Supports up to 3 asset images or 1 style image. Supported by Veo 3.1 models (preview).

object | object

required

string (byte)

Base64-encoded image dataFormat: byte

string

Cloud Storage URI of the image

string

MIME type of the image (image/jpeg or image/png)Possible values: image/jpeg, image/png

string

Optional identifier for the reference image

string

required

Type of reference imagePossible values: asset, style

object | object

Optional input video for video extension or editing. Incompatible with image and referenceImages.

string (byte)

Base64-encoded video bytesFormat: byte

string

Cloud Storage URI of the input video

string

MIME type of the videoPossible values: video/mov, video/mpeg, video/mp4, video/mpg, video/avi, video/wmv, video/mpegps, video/x-flv

object

string

Aspect ratio of the generated video. Default: 16:9Possible values: 16:9, 9:16

string

Video compression quality. Default: optimizedPossible values: optimized, lossless

number

Target duration of the generated video in seconds. Veo 2: 5-8. Veo 3/3.1: 4, 6, or 8. Default: 8

boolean

Automatically improve prompt for higher quality. Defaults to true.

integer

Frame rate of generated videos in frames per second

boolean

Whether to generate audio along with the video. Defaults to true. Supported by Veo 3.0+ models.

string

Text describing what to avoid in the generated video

string

Controls people in generated videos. Default: allow_adultPossible values: dont_allow, allow_adult, allowAll

string

Cloud Pub/Sub topic for progress updates (projects/{project}/topics/{topic})

string

Resize approach for input image. Default: padPossible values: pad, crop

string

Output video resolution. Supported by Veo 3.0+ models. Default: 720pPossible values: 720p, 1080p, 4k

integer

Number of videos to generate. If not specified, 1 video is generated.Range: 1 to 4

integer

Random seed for deterministic output. Different seeds used per video if sampleCount > 1.Format: uint32

string

Cloud Storage URI (gs://) for saving generated videos

string

Operation type for the video generation requestPossible values: textToVideo, imageToVideo, referenceToVideo, edit, extend, upscale

Generated from the schema Router serves at GET /v2/models/veo/veo-3.1-fast-generate-001/openapi.json, the same document it validates a call against before the request reaches the provider.

Output

boolean

Whether the operation has completed

object

Error details, present if the operation failed

integer

gRPC error code

string

Error message

string

Operation resource name

object

The prediction response, present when done is true

string

integer

Number of videos filtered by responsible AI policies

string[]

Reasons why videos were filtered by responsible AI policies

object[]

string

Base64-encoded video content

string

Cloud Storage URI of the generated video

string

Video MIME type (video/mp4)

Examples

Input

{
  "instances": [
    {
      "prompt": "a single red maple leaf falling onto still water, slow motion"
    }
  ],
  "parameters": {
    "durationSeconds": 4,
    "generateAudio": false,
    "sampleCount": 1
  }
}

Output

{
  "done": true,
  "name": "projects/example-project/locations/us-central1/publishers/google/models/veo-3.1-fast-generate-001/operations/1a2b3c4d",
  "response": {
    "@type": "type.googleapis.com/cloud.ai.large_models.vision.GenerateVideoResponse",
    "raiMediaFilteredCount": 0,
    "videos": [
      {
        "gcsUri": "https://storage.googleapis.com/EXAMPLE_BUCKET/veo/USER_ID/REQUEST_ID/sample_0.mp4",
        "mimeType": "video/mp4"
      }
    ]
  }
}

Before you ship

The snippets above are the shortest working call. Three things are the same for every model and are documented once on the Comfy Router headers page: send an Idempotency-Key on every paid call and reuse it when you retry, expect the connection to be held up to Router’s 10 minute deadline, and keep X-Comfy-Request-Id from every response. The SDKs do all three for you; the cURL tab does none of them. On failure, X-Comfy-Error-Type names the bucket, and a 422 means the body failed the model’s schema and was never billed.

Headers

Authentication, idempotency, request IDs, error buckets, retry pacing, spend limits.

Quick Start

Typed error handling in Python and TypeScript, reading the 422, walking the catalog.

Limitations

What Router does not do today, and what to use instead.

Develop with Comfy

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Specifications

Use Veo 3.1 Fast Generate 001 with Comfy Router

Quick start

Schema

Input

Output

Examples

Input

Output

Before you ship

Headers

Quick Start

Limitations

​Quick start

​Schema

​Input

​Output

​Examples

​Input

​Output

​Before you ship

Headers

Quick Start

Limitations

Quick start

Schema

Input

Output

Examples

Input

Output

Before you ship