ByteDanceFastHigh

Seedream 5.0 Flash Edit

ByteDance Seedream 5.0 Flash image editing via Fal.AI. Fast, low-cost editing and multi-reference composition from up to 10 input images (referenced as Figure 1, Figure 2, ...), at 1K-2K output.

63 credits

per image (63 credits/image, same price at every size)

Edit or combine up to 10 input images

Refer to inputs as Figure 1, Figure 2, ... in the prompt

Fast, budget-friendly — flat price per output image

Automatic aspect ratio with auto_1K / auto_2K presets

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/v5/flash/edit",
  "input": {
    "prompt": "Replace the product in Figure 1 with that in Figure 2. Seamlessly render the logo in Figure 3 into the product design, in a frosted glass texture.",
    "image_urls": [
      "https://storage.googleapis.com/falserverless/example_inputs/seedreamv45/seedream_v45_edit_input_1.png",
      "https://storage.googleapis.com/falserverless/example_inputs/seedreamv45/seedream_v45_edit_input_2.png",
      "https://storage.googleapis.com/falserverless/example_inputs/seedreamv45/seedream_v45_edit_input_3.png"
    ],
    "image_size": "auto_2K",
    "output_format": "jpeg"
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	The text prompt used to edit the image. Refer to inputs as Figure 1, Figure 2, ...
`image_urls`	array	Yes	-	Input reference images (up to 10; if more are sent, only the last 10 are used).
`image_size`	string	No	auto_2K	Output size preset. auto_1K / auto_2K pick the aspect ratio automatically; total pixels are between 1024x1024 and 2048x2048. Same price for every size. auto_2Kauto_1Ksquare_hdportrait_4_3portrait_16_9landscape_4_3landscape_16_9
`num_images`	integer	No	1	Number of separate generations to run, one image each (1-6). Charged per image.
`output_format`	string	No	jpeg	The file format of the generated image. jpegpng
`enable_safety_checker`	boolean	No	true	If set to true, the safety checker will be enabled.

How to Provide File Input

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

Recommended

Image URL

Pass a publicly accessible URL directly. With the Storage API (POST /v1/files/upload-url) the file uploads straight to S3 (50MB per file) and you pass the returned file_url.

{
  "model": "bytedance/seedream/v5/flash/edit",
  "input": {
    "prompt": "your prompt here",
    "image_urls": ["https://example.com/image.jpg"]
  }
}

Direct Upload (Multipart)

Attach files directly to POST /v1/predictions/upload. No separate upload step, but the bytes pass through the API server so the whole request is capped at 10MB.

curl -X POST "https://api.core.today/v1/predictions/upload" \
  -H "X-API-Key: cdt_your_api_key" \
  -F "model=bytedance/seedream/v5/flash/edit" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:image_urls=@your_file.png"

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

Product swap with logo

Replace a product and render a logo onto it from three references.

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/v5/flash/edit",
  "input": {
    "prompt": "Replace the product in Figure 1 with that in Figure 2. Seamlessly render the logo in Figure 3 into the product design, in a frosted glass texture.",
    "image_urls": [
      "https://storage.googleapis.com/falserverless/example_inputs/seedreamv45/seedream_v45_edit_input_1.png",
      "https://storage.googleapis.com/falserverless/example_inputs/seedreamv45/seedream_v45_edit_input_2.png",
      "https://storage.googleapis.com/falserverless/example_inputs/seedreamv45/seedream_v45_edit_input_3.png"
    ],
    "image_size": "auto_2K",
    "output_format": "jpeg"
  }
}'

Background change

Place the subject of a single photo on a new background, two variations.

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/v5/flash/edit",
  "input": {
    "prompt": "Place the product from Figure 1 on a sunlit marble kitchen counter with soft morning light",
    "image_urls": [
      "https://storage.googleapis.com/falserverless/example_inputs/seedreamv45/seedream_v45_edit_input_2.png"
    ],
    "num_images": 2
  }
}'