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POST
Runway Gen-4 Aleph
$0.18 per output second.

Authorizations

Authorization
string
header
required

API Key for API endpoints

Body

video_url
string<uri>
required

Input video to generate from.

prompt
string
required

Text prompt for video generation

aspect_ratio
enum<string>
default:16:9

Video aspect ratio

Available options:
16:9,
9:16,
4:3,
3:4,
1:1,
21:9
reference_image_url
string<uri>

Optional reference image.

n
integer
default:1

Number of results to generate (1-4)

Required range: 1 <= x <= 4

Response

Generation submission accepted

id
string
required

Generation id.

status
enum<string>
required

Queue status

Available options:
IN_QUEUE,
IN_PROGRESS,
COMPLETED,
FAILED,
CANCELED
input
Input · object
required

Normalized input payload for the generation task.

usage
object
required

Credit usage breakdown for the request

code
string

Machine-readable generation error code. Present when status is FAILED.

message
string

Sanitized human-readable failure message. Present when status is FAILED.