Documentation Index
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Pricing: $0.1/second. Endpoint:
POST /v1/models/google/veo3.1/fast/runs.Overview
- Endpoint: https://api.runflow.io/v1/models/google/veo3.1/fast/runs
- Model ID: google/veo3.1/fast
- Provider: Google
- License: commercial
- Last Updated: 2026-04-06
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
Node.js
cURL
Request parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
input | object | required | Model input parameters. See “Input schema” below. |
callback_url | string | null | optional | Webhook URL - POSTed when the run reaches a terminal state. |
metadata | object | null | optional | Arbitrary key-value pairs attached to the run. |
Input schema
| Field | Type | Required | Allowed values | Description |
|---|---|---|---|---|
prompt | string | required | Any | The text prompt describing the video you want to generate |
auto_fix | boolean | optional | Any | Whether to automatically attempt to fix prompts that fail content policy or other validation checks by rewriting them. |
duration | string | optional | 4s, 6s, 8s | The duration of the generated video. |
generate_audio | boolean | optional | Any | Whether to generate audio for the video. |
resolution | string | optional | 720p, 1080p, 4k | The resolution of the generated video. |
aspect_ratio | string | optional | 16:9, 9:16 | Aspect ratio of the generated video |
safety_tolerance | string | optional | 1, 2, 3, 4, 5, 6 | The safety tolerance level for content moderation. 1 is the most strict (blocks most content), 6 is the least strict. |
seed | integer | optional | Any | The seed for the random number generator. |
negative_prompt | string | optional | Any | A negative prompt to guide the video generation. |
Output schema
| Field | Type | Description |
|---|---|---|
outputs | json | Unified output array - one entry per generated artifact with url/type/width/height/duration/etc. |
nsfw_detected | json | true if the provider flagged output as NSFW, false if cleared, null if not checked. |
seed | json | Deterministic seed used for generation, or null if the provider doesn’t return one. |
timing | json | Provider timing info (inference_ms etc.), or null. |
Callback payload
When you provide acallback_url, Runflow POSTs to it once the run reaches a terminal state.
| Field | Type | Description |
|---|---|---|
event | string | Event type: “run.completed”, “run.failed”, or “run.cancelled”. |
run_id | string | The unique identifier of the run. |
status | string | Terminal status: “succeeded”, “failed”, or “cancelled”. |
output | object | null | The run output. Null if the run failed or was cancelled. |
duration_ms | number | null | Total run duration in milliseconds. |
created_at | string | null | ISO 8601 timestamp when the run was created. |
completed_at | string | null | ISO 8601 timestamp when the run reached terminal state. |
metadata | object | null | The 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-Idis always sent.Runflow-Signatureis sent if a signing secret is configured.
Additional Resources
Related
Browse all models
Browse the catalog.
Run lifecycle
Callbacks, polling, statuses.
Callbacks
Handle async results.
Pricing
How requests bill out.