Seedance 2.0 Fast

Text-to-Video • ByteDance

bytedance/seedance-2.0-fast

• Third-party

Faster variant of ByteDance's Seedance 2.0 video model. Trades some quality for speed while sharing the same multimodal architecture. Supports text-to-video, image-to-video, native audio generation, multimodal references (images, videos, audio), video editing, and video extension.

Usage

const response = await env.AI.run(
  'bytedance/seedance-2.0-fast',
  {
    prompt: 'A golden retriever running through a field of sunflowers on a sunny day',
    aspect_ratio: '16:9',
    duration: 5,
    resolution: '720p',
  },
)
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": "bytedance/seedance-2.0-fast",
  "input": {
    "prompt": "A golden retriever running through a field of sunflowers on a sunny day",
    "aspect_ratio": "16:9",
    "duration": 5,
    "resolution": "720p"
  }
}'

{
  "state": "Completed",
  "result": {
    "video": "https://examples.aig.cloudflare.com/bytedance/seedance-2.0-fast/quick-video.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

Examples

<details>

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

const response = await env.AI.run(
  'bytedance/seedance-2.0-fast',
  {
    prompt: 'A barista pouring latte art in a cozy coffee shop, close-up with shallow depth of field',
    aspect_ratio: '9:16',
    duration: 5,
    resolution: '720p',
  },
)
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": "bytedance/seedance-2.0-fast",
  "input": {
    "prompt": "A barista pouring latte art in a cozy coffee shop, close-up with shallow depth of field",
    "aspect_ratio": "9:16",
    "duration": 5,
    "resolution": "720p"
  }
}'

{
  "state": "Completed",
  "result": {
    "video": "https://examples.aig.cloudflare.com/bytedance/seedance-2.0-fast/portrait-video.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

</details>

<details>

<summary>Virtual Avatar Reference — Use a virtual character avatar from the trusted asset library</summary>

const response = await env.AI.run(
  'bytedance/seedance-2.0-fast',
  {
    image: 'https://ark-doc.tos-ap-southeast-1.bytepluses.com/doc_image/r2v_tea_pic1.jpg',
    prompt: 'The scene gently animates with subtle motion',
    aspect_ratio: '16:9',
    duration: 5,
    resolution: '720p',
    use_virtual_avatar: true,
    generate_audio: false,
  },
)
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": "bytedance/seedance-2.0-fast",
  "input": {
    "image": "https://ark-doc.tos-ap-southeast-1.bytepluses.com/doc_image/r2v_tea_pic1.jpg",
    "prompt": "The scene gently animates with subtle motion",
    "aspect_ratio": "16:9",
    "duration": 5,
    "resolution": "720p",
    "use_virtual_avatar": true,
    "generate_audio": false
  }
}'

{
  "state": "Completed",
  "result": {
    "video": "https://examples.aig.cloudflare.com/bytedance/seedance-2.0-fast/virtual-avatar-reference.mp4"
  },
  "gatewayMetadata": {
    "keySource": "Unified"
  }
}

</details>

Parameters

prompt

stringrequiredmaxLength: 2000Text prompt describing the video to generate

image

stringReference image (HTTP(S) URL or base64 data URI) for image-to-video

reference_video

stringReference video (HTTP(S) URL or base64 data URI) for style/motion guidance

last_frame_image

stringReference image (HTTP(S) URL or base64 data URI) for last-frame guidance. Only works if an image start frame is also given.

▶reference_images[]

arraymaxItems: 4Reference images (1-4, HTTP(S) URLs or base64 data URIs) to guide video generation for characters, avatars, clothing, or environments. Cannot be used with first/last frame images.

duration

integerrequireddefault: 5minimum: 4maximum: 12Video duration in seconds

resolution

stringrequireddefault: 720penum: 480p, 720pVideo resolution

aspect_ratio

stringrequireddefault: 16:9enum: 16:9, 4:3, 1:1, 3:4, 9:16, 21:9, 9:21Video aspect ratio. Ignored if an image is used.

fps

numberrequireddefault: 24const: 24Frame rate (frames per second)

camera_fixed

booleanrequireddefault: falseWhether to fix camera position

generate_audio

booleanWhether to generate audio with the video

watermark

booleanrequireddefault: falseWhether to add a watermark to the output video

seed

integerminimum: -9007199254740991maximum: 9007199254740991Random seed for reproducible generation

use_virtual_avatar

booleanrequireddefault: falseRoute image reference inputs (image, reference_images, last_frame_image) through ByteDance's trusted virtual avatar asset library before generation. Intended for AI-generated/virtual character avatars that would otherwise be blocked by face or deepfake detection

video

stringformat: uriURL to the generated video

API Schemas (Raw)

Input Open Download

Output Open Download

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description: ByteDance's compact, cost-efficient video generation model from the Seedance 2.0 family. Supports text-to-video, image-to-video, reference video, and reference audio for background music. Ideal for high-volume workloads where speed and cost matter. title: Seedance 2.0 Mini image: https://developers.cloudflare.com/og-docs.png

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