Runway Gen-4.5

curl --request POST \
  --url https://api.shuyou.ai/v1/predictions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "gen4.5",
  "input": {
    "prompt": "A cinematic shot of a majestic lion in the savannah at golden hour",
    "aspect_ratio": "16:9",
    "duration": 5
  }
}
'

{
  "data": {
    "task_id": "2c4d50261173430290971a2395a3b607",
    "task_status": "processing"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

POST

predictions

curl --request POST \
  --url https://api.shuyou.ai/v1/predictions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "gen4.5",
  "input": {
    "prompt": "A cinematic shot of a majestic lion in the savannah at golden hour",
    "aspect_ratio": "16:9",
    "duration": 5
  }
}
'

{
  "data": {
    "task_id": "2c4d50261173430290971a2395a3b607",
    "task_status": "processing"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "type": "<string>"
  }
}

Overview

Runway Gen-4.5 (gen4.5) supports:

Text-to-video — prompt only
Image-to-video — optional first_frame_url as the initial frame

Input parameters

Field	Required	Default	Notes
`prompt`	Yes	—	Text prompt for video generation
`aspect_ratio`	No	`1:1`	`16:9`, `9:16`, `4:3`, `3:4`, `1:1`, `21:9`
`duration`	No	`5`	`5` or `10` seconds
`first_frame_url`	No	—	Optional first-frame image URL

Authorizations

Authorization

string

header

required

Authorization: Bearer YOUR_API_KEY

Body

application/json

model

enum<string>

default:gen4.5

required

Model ID. Use gen4.5 for this endpoint.

Available options:

gen4.5

Example:

"gen4.5"

input

object

required

Show child attributes

webhook

string<uri>

Optional HTTPS callback URL when the task completes, fails, or is cancelled.

Response

Async task created

data

object

required

Show child attributes

Language Series

Image Series

Audio Series

Video Series

Provider Series

File Series

Task Management

Account Management

Overview

Input parameters

Authorizations

Body

Response

​Overview

​Input parameters

Authorizations

Body

Response

Overview

Input parameters