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POST
/
generate
/
video
/
runway
/
gen-4.5
Runway Gen-4.5
curl --request POST \
  --url https://api.krea.ai/generate/video/runway/gen-4.5 \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "Persian caravanserais, where silk routes pause and dream."
}
'
{
  "job_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "2023-11-07T05:31:56Z",
  "completed_at": null,
  "result": null,
  "error": {
    "code": "<string>",
    "message": "<string>"
  }
}

​
Pricing

Fixed API prices in USD.
Price: $0.126 per second
These aliases are accepted for compatibility only and are not shown in the request schema.
DeprecatedUse insteadAccepted until
startImagestart_image2026-06-19
aspectRatioaspect_ratio2026-06-19

Authorizations

​
Authorization
string
header
required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Headers

​
X-Webhook-URL
string<uri>

URL to receive a POST request when the job completes. The webhook will receive the job data including results.

Body

application/json
​
prompt
string
required
​
start_image
string<uri>

Can be an external URL, base64 data URI, or uploaded asset URL.

Maximum string length: 1024
​
aspect_ratio
enum<string>
default:1280:720
Available options:
1280:720,
720:1280,
1104:832,
832:1104,
960:960,
1584:672,
672:1584
​
duration
number
default:5
Required range: 2 <= x <= 10
​
seed
number

Response

The resulting job data. This will be returned in a pending state until the job is completed. See /jobs/{id} for retrieving the results.

​
job_id
string<uuid>
required
​
status
enum<string>
required
Available options:
backlogged,
queued,
scheduled,
processing,
sampling,
intermediate-complete,
completed,
failed,
cancelled
​
created_at
string<date-time>
required
​
completed_at
null
required
​
result
null
required
​
error
object