RunwayML Gen-4.5

Text-to-Video • RunwayML

runwayml/gen-4.5

  • Third-party

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 <ul><li>Default (per second)$0.12</li></ul>

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',
    duration: 5,
    ratio: '1280:720',
  },
)
console.log(response)

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "runwayml/gen-4.5",
  "input": {
    "prompt": "A timelapse of the Eiffel Tower on a sunny day with clouds flying by",
    "duration": 5,
    "ratio": "1280:720"
  }
}'

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

Examples

<details>

<summary>Portrait Video — Vertical video for social media</summary>

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',
    duration: 5,
    ratio: '720:1280',
  },
)
console.log(response)

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "runwayml/gen-4.5",
  "input": {
    "prompt": "A busy street in Tokyo at night with neon signs reflecting on wet pavement, rain falling",
    "duration": 5,
    "ratio": "720:1280"
  }
}'

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

</details>

<details>

<summary>Nature Close-up — Close-up wildlife shot in 16:9</summary>

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',
    duration: 5,
    ratio: '1280:720',
  },
)
console.log(response)

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "runwayml/gen-4.5",
  "input": {
    "prompt": "Close-up of a hummingbird feeding from a vibrant red flower, slow motion with soft bokeh background",
    "duration": 5,
    "ratio": "1280:720"
  }
}'

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

</details>

<details>

<summary>Cinematic Scene — Longer duration cinematic video</summary>

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',
    duration: 10,
    ratio: '1280:720',
  },
)
console.log(response)

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "runwayml/gen-4.5",
  "input": {
    "prompt": "Aerial drone shot flying through a misty forest at dawn, rays of sunlight breaking through the trees",
    "duration": 10,
    "ratio": "1280:720"
  }
}'

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

</details>

<details>

<summary>Image-to-Video — Animate an existing image</summary>

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

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "runwayml/gen-4.5",
  "input": {
    "prompt": "Camera slowly pans across the scene, gentle wind blowing",
    "duration": 5,
    "image_input": "https://upload.wikimedia.org/wikipedia/commons/8/85/Tour_Eiffel_Wikimedia_Commons_(cropped).jpg",
    "ratio": "1280:720"
  }
}'

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

</details>

<details>

<summary>Reproducible Generation — Use seed for consistent results</summary>

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

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "runwayml/gen-4.5",
  "input": {
    "prompt": "A sailboat gliding across calm ocean waters at sunset",
    "duration": 5,
    "ratio": "1280:720",
    "seed": 42
  }
}'

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

</details>

<details>

<summary>With Content Moderation — Adjust content moderation settings</summary>

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

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "runwayml/gen-4.5",
  "input": {
    "prompt": "A press conference with multiple speakers at podiums",
    "content_moderation": {
      "public_figure_threshold": "low"
    },
    "duration": 5,
    "ratio": "1280:720"
  }
}'

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

</details>

Parameters

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 Open Download

Output Open Download

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RunwayML Gen-4.5 - 图1Docs

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description: Inkling is Thinking Machines' open-weights hybrid reasoning model, built on a mixture-of-experts architecture. It reasons by default, exposing its chain-of-thought as leading thinking content blocks, with reasoning effort tunable via a Tinker-specific output_config.effort parameter. Available through Tinker's beta Anthropic Messages-compatible endpoint alongside tool use, streaming, and multi-turn conversations. Currently intended for low-traffic testing and internal use rather than high-throughput production deployments; prompt caching, citations, and audio input are not supported through this endpoint. title: Inkling image: https://developers.cloudflare.com/og-docs.png

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