Use Veo3.1 Fast through Rivya Public API v1 with model id veo3-1-fast, supported inputs, parameters, Files API rules, credits, and response examples.

Available via APIText or URL ready; reference modes use Files APIVideo

API model id

veo3-1-fast

Inputs

text, file

Files API

Required for reference modes

Base credits

per_video · generate_720p=30 · generate_1080p=37.5 · generate_4K=90 · extend_fast=30 · get_1080p=7.5 · get_4K=60 · ⌈total⌉

Capability

Video

Billing

FIXED

Prompt limit

5000 characters

Request contract

Send the model id at the top level. Model-specific controls belong in params.

Key	Type	Required	Default	Description
model	string	Yes	veo3-1-fast	Use the veo3-1-fast API model id.
prompt	string	Yes	-	Maximum 5000 characters for this model.
params	object	No	-	Model-specific parameter object. Use the rows below for allowed keys.
client_request_id	string	No	-	Optional client-side id for tracing requests in your system.

Model parameters

Key	Type	Required	Default	Range	Options	Description
generationType	select	No	TEXT_2_VIDEO	-	TEXT_2_VIDEO, FIRST_AND_LAST_FRAMES_2_VIDEO, REFERENCE_2_VIDEO	Generation mode
aspectRatio	select	No	16:9	-	16:9, 9:16, Auto	Aspect ratio
resolution	select	No	720p	-	720p, 1080p, 4k	Resolution
duration	select	No	8	-	4, 6, 8	Duration
watermark	text	No	-	-	-	Watermark text
enableTranslation	select	No	true	-	true, false	Prompt translation

Upload policy

Upload reference files first, then place the returned URL and duration token inside params.referenceMediaItems.

Reference rule

Reference image: Reference mode accepts 1–3 verified JPEG or PNG images up to 10 MB each, only 16:9 or 9:16, and requires an 8-second duration.

Max files

Accepted file kinds

image

Duration token

Video and audio references should carry durationToken from /api/v1/files when duration verification is required.

kind	Max size	MIME types
image	10 MB	image/jpeg, image/png

Minimal request

{
  "model": "veo3-1-fast",
  "prompt": "A cinematic product reveal with smooth camera movement",
  "params": {
    "generationType": "TEXT_2_VIDEO",
    "aspectRatio": "16:9",
    "resolution": "720p",
    "duration": "8",
    "watermark": "Optional watermark text",
    "enableTranslation": "true"
  }
}

Reference-file request

{
  "model": "veo3-1-fast",
  "prompt": "A cinematic product reveal with smooth camera movement",
  "params": {
    "generationType": "TEXT_2_VIDEO",
    "aspectRatio": "16:9",
    "resolution": "720p",
    "duration": "8",
    "watermark": "Optional watermark text",
    "enableTranslation": "true",
    "referenceMediaItems": [
      {
        "url": "https://cdn.example.com/reference-image.png",
        "kind": "image",
        "name": "reference-image.png",
        "mimeType": "image/png"
      }
    ]
  }
}

Create response

The create endpoint returns a public task id. Poll the status endpoint until the task succeeds or fails.

{
  "id": "task_veo3_1_fast_example",
  "status": "queued",
  "model": "veo3-1-fast",
  "reserved_credits": 30,
  "final_credits": 0,
  "settlement_status": "RESERVED",
  "created_at": "2026-05-11T00:00:00.000Z",
  "updated_at": "2026-05-11T00:00:00.000Z",
  "result": null,
  "error": null
}

Common errors

validation_failed, insufficient_credits, idempotency_conflict, rate_limited, not_found

Some modes require Files API reference uploads.

Veo3.1 Fast API Integration