ByteDanceMediumUltra

Seedream 4.5

Upgraded ByteDance image model with stronger spatial understanding and world knowledge. Supports single/multi-reference image-to-image editing and sequential (multi-image) generation.

90 credits

per image — sequential mode (auto) scales per generated image, up to max_images (15)

Strong spatial understanding and world knowledge

Multi-reference image-to-image generation (up to 14 input images)

Sequential generation mode producing up to 15 related images in one call

2K and 4K resolution, plus custom width/height

Wide range of aspect ratios including auto-match to input image

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/seedream-4.5",
  "input": {
    "prompt": "A warm, nostalgic film-style interior of a cozy café, shot on 35mm-inspired digital photography with soft afternoon sunlight filtering through the front windows.",
    "size": "4K",
    "aspect_ratio": "16:9",
    "sequential_image_generation": "disabled"
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	Text prompt for image generation (max 4000 characters)
`image_input`	array	No	[]	Input image(s) for image-to-image generation (1-14 images for single/multi-reference)
`size`	string	No	2K	Image resolution: 2K, 4K, or custom (1K is not supported) 2K4Kcustom
`width`	integer	No	2048	Custom image width, 1024-4096 (only used when size=custom)
`height`	integer	No	2048	Custom image height, 1024-4096 (only used when size=custom)
`aspect_ratio`	string	No	match_input_image	Image aspect ratio. Ignored when size=custom match_input_image1:14:33:44:55:416:99:163:22:321:99:21
`sequential_image_generation`	string	No	disabled	'disabled' generates one image; 'auto' lets the model generate multiple related images disabledauto
`max_images`	integer	No	1	Max images to generate when sequential_image_generation=auto (1-15). Billed per generated image
`disable_safety_checker`	boolean	No	false	Disable the safety checker for generated images

How to Provide File Input

There are 3 ways to provide files for the image_input parameter:

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/seedream-4.5" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:image_input=@your_file.png"

Image URL

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

{
  "model": "bytedance/seedream-4.5",
  "input": {
    "prompt": "your prompt here",
    "image_input": ["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

4K Interior Photography (Default)

High-resolution single-image generation at 4K

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/seedream-4.5",
  "input": {
    "prompt": "A warm, nostalgic film-style interior of a cozy café, shot on 35mm-inspired digital photography with soft afternoon sunlight filtering through the front windows.",
    "size": "4K",
    "aspect_ratio": "16:9",
    "sequential_image_generation": "disabled"
  }
}'

Sequential Story Scenes

Generate up to 15 related images (e.g. story scenes or character variations) in one call

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/seedream-4.5",
  "input": {
    "prompt": "A children's book spread showing a fox exploring a forest across four consecutive scenes",
    "sequential_image_generation": "auto",
    "max_images": 4
  }
}'