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Pricing: $0.1/second. Endpoint: POST /v1/models/google/veo3.1/fast/runs.
Faster and more cost effective version of Google’s Veo 3.1!

Overview

Pricing

  • Base price: $0.1/second
  • Note: Without audio

Veo 3.1 Fast API

Endpoint: POST /v1/models/google/veo3.1/fast/runs

Run the model

Python

import requests

response = requests.post(
    "https://api.runflow.io/v1/models/google/veo3.1/fast/runs",
    headers={"Authorization": "Bearer RUNFLOW_API_KEY"},
    json={
        "input": {
            "prompt": "First-person POV looking down at a pair of hands opening a premium matte black box on a clean white marble surface. Fingers lift the magnetic lid, revealing layers of black tissue paper. Hands carefully part the tissue paper to reveal a sleek titanium watch with a dark blue dial nestled in a velvet cushion. The brushed titanium case catches overhead light as the hands lift the watch out - you can see the weight of it. Fingers operate the butterfly clasp, then buckle the watch onto the left wrist. ASMR sounds: the soft click of the box lid, rustling tissue paper, the satisfying clasp click. Close-up, warm lighting, luxurious feel. Product commercial quality.",
            "duration": "8s",
            "resolution": "1080p",
            "aspect_ratio": "9:16",
            "generate_audio": True
        },
        "callback_url": "https://your-server.com/webhook"
    },
)

data = response.json()
print(data)

Node.js

const response = await fetch(
  "https://api.runflow.io/v1/models/google/veo3.1/fast/runs",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer RUNFLOW_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
        "input": {
            "prompt": "First-person POV looking down at a pair of hands opening a premium matte black box on a clean white marble surface. Fingers lift the magnetic lid, revealing layers of black tissue paper. Hands carefully part the tissue paper to reveal a sleek titanium watch with a dark blue dial nestled in a velvet cushion. The brushed titanium case catches overhead light as the hands lift the watch out - you can see the weight of it. Fingers operate the butterfly clasp, then buckle the watch onto the left wrist. ASMR sounds: the soft click of the box lid, rustling tissue paper, the satisfying clasp click. Close-up, warm lighting, luxurious feel. Product commercial quality.",
            "duration": "8s",
            "resolution": "1080p",
            "aspect_ratio": "9:16",
            "generate_audio": true
        },
        "callback_url": "https://your-server.com/webhook"
    }),
  }
);

const data = await response.json();
console.log(data);

cURL

curl -X POST https://api.runflow.io/v1/models/google/veo3.1/fast/runs \
  -H "Authorization: Bearer $RUNFLOW_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
    "input": {
        "prompt": "First-person POV looking down at a pair of hands opening a premium matte black box on a clean white marble surface. Fingers lift the magnetic lid, revealing layers of black tissue paper. Hands carefully part the tissue paper to reveal a sleek titanium watch with a dark blue dial nestled in a velvet cushion. The brushed titanium case catches overhead light as the hands lift the watch out - you can see the weight of it. Fingers operate the butterfly clasp, then buckle the watch onto the left wrist. ASMR sounds: the soft click of the box lid, rustling tissue paper, the satisfying clasp click. Close-up, warm lighting, luxurious feel. Product commercial quality.",
        "duration": "8s",
        "resolution": "1080p",
        "aspect_ratio": "9:16",
        "generate_audio": true
    },
    "callback_url": "https://your-server.com/webhook"
}
JSON

Request parameters

ParameterTypeRequiredDescription
inputobjectrequiredModel input parameters. See “Input schema” below.
callback_urlstring | nulloptionalWebhook URL - POSTed when the run reaches a terminal state.
metadataobject | nulloptionalArbitrary key-value pairs attached to the run.

Input schema

FieldTypeRequiredAllowed valuesDescription
promptstringrequiredAnyThe text prompt describing the video you want to generate
auto_fixbooleanoptionalAnyWhether to automatically attempt to fix prompts that fail content policy or other validation checks by rewriting them.
durationstringoptional4s, 6s, 8sThe duration of the generated video.
generate_audiobooleanoptionalAnyWhether to generate audio for the video.
resolutionstringoptional720p, 1080p, 4kThe resolution of the generated video.
aspect_ratiostringoptional16:9, 9:16Aspect ratio of the generated video
safety_tolerancestringoptional1, 2, 3, 4, 5, 6The safety tolerance level for content moderation. 1 is the most strict (blocks most content), 6 is the least strict.
seedintegeroptionalAnyThe seed for the random number generator.
negative_promptstringoptionalAnyA negative prompt to guide the video generation.

Output schema

FieldTypeDescription
outputsjsonUnified output array - one entry per generated artifact with url/type/width/height/duration/etc.
nsfw_detectedjsontrue if the provider flagged output as NSFW, false if cleared, null if not checked.
seedjsonDeterministic seed used for generation, or null if the provider doesn’t return one.
timingjsonProvider timing info (inference_ms etc.), or null.

Callback payload

When you provide a callback_url, Runflow POSTs to it once the run reaches a terminal state.
FieldTypeDescription
eventstringEvent type: “run.completed”, “run.failed”, or “run.cancelled”.
run_idstringThe unique identifier of the run.
statusstringTerminal status: “succeeded”, “failed”, or “cancelled”.
outputobject | nullThe run output. Null if the run failed or was cancelled.
duration_msnumber | nullTotal run duration in milliseconds.
created_atstring | nullISO 8601 timestamp when the run was created.
completed_atstring | nullISO 8601 timestamp when the run reached terminal state.
metadataobject | nullThe metadata object passed at run creation, if any.
  • Retries: 3 attempts with exponential backoff (1s, 2s). Retries on 5xx / network errors only.
  • Headers: Runflow-Request-Id is always sent. Runflow-Signature is sent if a signing secret is configured.

Additional Resources

Browse all models

Browse the catalog.

Run lifecycle

Callbacks, polling, statuses.

Callbacks

Handle async results.

Pricing

How requests bill out.