Black Forest LabsMediumUltra

FLUX 2 Pro

Professional-grade FLUX 2 with high-quality editing and up to 8 reference image support. Excellent balance of quality, speed, and creative control.

100 credits

per image

Up to 8 reference images supported

High-quality image editing

Ultra-quality generation

Professional-grade output

Excellent prompt understanding

Use with AI Assistant

Copy usage instructions for Claude, ChatGPT, or other AI

llms.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": "black-forest-labs/flux-2-pro",
  "input": {
    "prompt": "Luxury perfume bottle on polished marble surface, soft diffused lighting, editorial advertisement quality, shallow depth of field, 8k ultra detailed",
    "image_size": "square_hd",
    "guidance_scale": 3.5
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	Text description of the image to generate
`image_size`	string	No	landscape_4_3	Output image dimensions square_hdsquareportrait_4_3portrait_16_9landscape_4_3landscape_16_9
`image_url`	string	No	-	Reference image URL for editing or style guidance
`seed`	integer	No	-	Random seed for reproducibility
`guidance_scale`	float	No	3.5	Prompt adherence strength
`safety_tolerance`	string	No	2	Content safety level (1-6)

How to Provide File Input

There are 3 ways to provide files for the image_url 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=black-forest-labs/flux-2-pro" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:image_url=@your_file.png"

Image URL

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

{
  "model": "black-forest-labs/flux-2-pro",
  "input": {
    "prompt": "your prompt here",
    "image_url": "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

Premium Product Shot

Generate high-end product photography

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "black-forest-labs/flux-2-pro",
  "input": {
    "prompt": "Luxury perfume bottle on polished marble surface, soft diffused lighting, editorial advertisement quality, shallow depth of field, 8k ultra detailed",
    "image_size": "square_hd",
    "guidance_scale": 3.5
  }
}'