ByteDanceFastHigh

Seedance 2.0 Fast

A faster, cheaper variant of Seedance 2.0 for quicker video generation with multimodal reference inputs (up to 9 images, 3 videos, 3 audios) and native audio, at 480p or 720p.

1750 credits

per 5s 720p video, text/image input — billed per second (480p 163/s, 720p 349/s; with reference videos 480p 186/s, 720p 396/s)

Faster, lower-cost alternative to Seedance 2.0 (480p/720p only, no 1080p/4K)

Native audio generation — dialogue, sound effects, and background music

Multimodal reference inputs: up to 9 images, 3 videos, 3 audio files

Intelligent duration mode (duration: -1) lets the model pick the best length

Reference videos raise the per-second price (~14-17%) for motion transfer/editing

Run it right now

Test this model instantly in the Console Playground — no code required

Use with AI Assistant

Copy usage instructions for Claude, ChatGPT, or other AI

llms.txtllms.txt ↗

Quick Start

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "bytedance/seedance-2.0-fast",
  "input": {
    "prompt": "A cozy cabin in a snowy forest at night, warm light glowing from the windows, gentle snowfall, camera slowly pushing in through the trees",
    "duration": 7,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "generate_audio": true
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	Text prompt for video generation
`image`	string	No	-	Input image for image-to-video generation (first frame). Cannot combine with reference images
`last_frame_image`	string	No	-	Last frame image (requires a first frame image; cannot combine with reference images)
`reference_images`	array	No	[]	Up to 9 reference images for character consistency and scene composition
`reference_videos`	array	No	[]	Up to 3 reference videos (total ≤15s) for motion transfer and editing. Raises the per-second price
`reference_audios`	array	No	[]	Up to 3 reference audio files (total ≤15s) for audio-driven generation and lip-sync
`duration`	integer	No	5	Video duration in seconds (1-15). Set to -1 for intelligent duration
`resolution`	string	No	720p	Video resolution (480p or 720p only) 480p720p
`aspect_ratio`	string	No	16:9	Video aspect ratio. 'adaptive' lets the model choose based on inputs 16:94:31:13:49:1621:99:21adaptive
`generate_audio`	boolean	No	true	Generate synchronized audio (dialogue, SFX, background music) at no extra charge
`seed`	integer	No	-	Random seed for reproducible generation

How to Provide File Input

There are 3 ways to provide files for the imagelast_frame_imagereference_imagesreference_videosreference_audios parameters:

Recommended

Direct Upload (Multipart)

Attach files directly to POST /v1/predictions/upload. No separate upload step needed.

curl -X POST "https://api.core.today/v1/predictions/upload" \
  -H "X-API-Key: cdt_your_api_key" \
  -F "model=bytedance/seedance-2.0-fast" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:image=@your_file.png"

Image URL

Pass a publicly accessible URL directly. You can also use file_url from the Storage API.

{
  "model": "bytedance/seedance-2.0-fast",
  "input": {
    "prompt": "your prompt here",
    "image": "https://example.com/image.jpg"
  }
}

See the File Upload docs for more upload methods including Presigned URLs.

Common Parameters

Common parameters used when calling POST /v1/predictions.

Parameter	Type	Required	Default	Description
`model`	string	Yes	-	Model identifier
`input`	object	Yes	-	Object containing the model-specific parameters from the table above
`output_folder`	string	No	-	Folder path for output files (max 256 chars, '..' not allowed)
`webhook_url`	string	No	-	Webhook URL to call on completion
`is_public`	boolean	No	false	If true, output files are also available via permanent public URLs

Examples

Cozy Scene with Audio (720p)

Text-to-video with synchronized ambient audio at the default 720p resolution

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "bytedance/seedance-2.0-fast",
  "input": {
    "prompt": "A cozy cabin in a snowy forest at night, warm light glowing from the windows, gentle snowfall, camera slowly pushing in through the trees",
    "duration": 7,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "generate_audio": true
  }
}'

Motion Transfer from Reference Video (480p)

Using a reference video for motion transfer at the cheaper 480p tier

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "bytedance/seedance-2.0-fast",
  "input": {
    "prompt": "The character from [Image1] performs the dance from [Video1]",
    "duration": 5,
    "resolution": "480p",
    "aspect_ratio": "16:9",
    "generate_audio": false
  }
}'