RunwayML Gen-4.5

Text-to-Video • RunwayML • Proxied

RunwayML's video generation model supporting both text-to-video and image-to-video with customizable duration, aspect ratio, and content moderation controls.

Model Info
Terms and License	link ↗
More information	link ↗
Pricing	View pricing in the Cloudflare dashboard ↗

Usage

const response = await env.AI.run(
  'runwayml/gen-4.5',
  {
    prompt:
      'A timelapse of the Eiffel Tower on a sunny day with clouds flying by',
    ratio: '1280:720',
    duration: 5,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "video": "https://dnznrvs05pmza.cloudfront.net/fd840364-360e-4903-8500-d5787fd8ab90.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Examples

Portrait Video — Vertical video for social media

const response = await env.AI.run(
  'runwayml/gen-4.5',
  {
    prompt:
      'A busy street in Tokyo at night with neon signs reflecting on wet pavement, rain falling',
    ratio: '720:1280',
    duration: 5,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "video": "https://dnznrvs05pmza.cloudfront.net/44f43eac-8c12-4084-ace3-6395fa67c13e.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Nature Close-up — Close-up wildlife shot in 16:9

const response = await env.AI.run(
  'runwayml/gen-4.5',
  {
    prompt:
      'Close-up of a hummingbird feeding from a vibrant red flower, slow motion with soft bokeh background',
    ratio: '1280:720',
    duration: 5,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "video": "https://dnznrvs05pmza.cloudfront.net/e03781eb-2544-45ae-a9a8-6148d556bf2a.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Cinematic Scene — Longer duration cinematic video

const response = await env.AI.run(
  'runwayml/gen-4.5',
  {
    prompt:
      'Aerial drone shot flying through a misty forest at dawn, rays of sunlight breaking through the trees',
    ratio: '1280:720',
    duration: 10,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "video": "https://dnznrvs05pmza.cloudfront.net/23ea177e-523d-45b4-9f8c-c4f8d7238ff0.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Image-to-Video — Animate an existing image

const response = await env.AI.run(
  'runwayml/gen-4.5',
  {
    prompt: 'Camera slowly pans across the scene, gentle wind blowing',
    image_input:
      'https://upload.wikimedia.org/wikipedia/commons/8/85/Tour_Eiffel_Wikimedia_Commons_(cropped).jpg',
    ratio: '1280:720',
    duration: 5,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "video": "https://dnznrvs05pmza.cloudfront.net/ab424367-7431-4a0a-aa39-52604ff9150a.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Reproducible Generation — Use seed for consistent results

const response = await env.AI.run(
  'runwayml/gen-4.5',
  {
    prompt: 'A sailboat gliding across calm ocean waters at sunset',
    ratio: '1280:720',
    duration: 5,
    seed: 42,
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "video": "https://dnznrvs05pmza.cloudfront.net/0bdfbec7-0823-4529-bdb5-d37bb24adb0d.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

With Content Moderation — Adjust content moderation settings

const response = await env.AI.run(
  'runwayml/gen-4.5',
  {
    prompt: 'A press conference with multiple speakers at podiums',
    ratio: '1280:720',
    duration: 5,
    content_moderation: {
      public_figure_threshold: 'low',
    },
  },
  {
    gateway: { id: 'default' },
  }
)
console.log(response)

Output
Raw response

{
  "state": "Completed",
  "result": {
    "video": "https://dnznrvs05pmza.cloudfront.net/75c4cb0d-20aa-4824-b1f3-32f33ab9269b.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

prompt

stringrequiredminLength: 1maxLength: 1000Text prompt describing what should appear in the video

image_input

stringHTTPS URL, Runway URI, or data URI containing an image for image-to-video

ratio

stringrequireddefault: 1280:720enum: 1280:720, 720:1280, 1104:832, 960:960, 832:1104, 1584:672Resolution/aspect ratio of the output video

duration

integerrequireddefault: 5minimum: 2maximum: 10Video duration in seconds

seed

integerminimum: 0maximum: 4294967295Random seed for reproducible results

▶content_moderation{}

objectContent moderation settings

video

stringformat: uriURL to the generated video

API Schemas (Raw)

Input

Output