Use Runway Aleph through Rivya Public API v1 with model id runway-aleph, supported inputs, parameters, Files API rules, credits, and response examples.

Available via APIReadinessVideo

API model id

runway-aleph

Inputs

file

Files API

Required for reference modes

Base credits

per_video · default=90 · ⌈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	runway-aleph	Use the runway-aleph 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
aspectRatio	select	No	16:9	-	16:9, 9:16, 4:3, 3:4, 1:1, 21:9	Aspect ratio
waterMark	text	No	-	-	-	Watermark
seed	number	No	-	-	-	Leave it empty for a new random result each time. Reusing the same integer makes it easier to reproduce or fine-tune a previous result. It stays closer only when the prompt and other key settings also remain similar, and it is not a guaranteed 1:1 match.

Upload policy

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

Reference rule

Input media: Upload the source clip you want Aleph to transform. Add one optional still image only when you need extra style or subject guidance.

Max files

Accepted file kinds

video, image

Duration token

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

kind	Max size	MIME types
video	95 MB	video/mp4, video/quicktime
image	10 MB	image/jpeg, image/png, image/webp

Minimal request

{
  "model": "runway-aleph",
  "params": {
    "aspectRatio": "16:9",
    "waterMark": "Leave empty to disable watermark",
    "seed": 1
  }
}

Reference-file request

{
  "model": "runway-aleph",
  "params": {
    "aspectRatio": "16:9",
    "waterMark": "Leave empty to disable watermark",
    "seed": 1,
    "referenceMediaItems": [
      {
        "url": "https://cdn.example.com/reference-video.mp4",
        "kind": "video",
        "name": "reference-video.mp4",
        "mimeType": "video/mp4",
        "durationSeconds": 8,
        "durationToken": "video_duration_token_from_files_api"
      }
    ]
  }
}

Create response

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

{
  "id": "task_runway_aleph_example",
  "status": "queued",
  "model": "runway-aleph",
  "reserved_credits": 90,
  "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.

Runway Aleph API Integration