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POST
/
v1
/
flux-2-klein-9b-preview
Generate or edit an image with FLUX.2 [klein] 9B (preview)
curl --request POST \
  --url https://api.bfl.ai/v1/flux-2-klein-9b-preview \
  --header 'Content-Type: application/json' \
  --header 'x-key: <api-key>' \
  --data '
{
  "prompt": "ein fantastisches bild",
  "input_image": "<string>",
  "input_image_2": "<string>",
  "input_image_3": "<string>",
  "input_image_4": "<string>",
  "seed": 42,
  "width": 0,
  "height": 0,
  "safety_tolerance": 2,
  "output_format": "jpeg",
  "webhook_url": "<string>",
  "webhook_secret": "<string>"
}
'
{
  "id": "<string>",
  "polling_url": "<string>",
  "cost": 123,
  "input_mp": 123,
  "output_mp": 123
}

Documentation Index

Fetch the complete documentation index at: https://docs.bfl.ml/llms.txt

Use this file to discover all available pages before exploring further.

Preview endpoint for FLUX.2 [klein] 9B. For stable production use, start with FLUX.2 [klein] 9B. See which model to use.

Authorizations

​
x-key
string
header
required

Body

application/json

Input model for FLUX.2 Klein (non-base) - like Pro but max 4 images.

​
prompt
string
required

Text prompt for image generation.

Example:

"ein fantastisches bild"

​
input_image
string | null

Path to the input image.

​
input_image_2
string | null

Path to the second input image.

​
input_image_3
string | null

Path to the third input image.

​
input_image_4
string | null

Path to the fourth input image.

​
seed
integer | null

Optional seed for reproducibility.

Example:

42

​
width
integer | null
default:0

Width of the image

Required range: x >= 64
​
height
integer | null
default:0

Height of the image

Required range: x >= 64
​
safety_tolerance
integer
default:2

Tolerance level for input and output moderation. Between 0 and 5, 0 being most strict, 5 being least strict. If you wish to increase the safety_tolerance beyond these levels please reach out to the team.

Required range: 0 <= x <= 5
​
output_format
enum<string> | null
default:jpeg
Available options:
jpeg,
png,
webp
​
webhook_url
string<uri> | null

URL to receive webhook notifications

Required string length: 1 - 2083
​
webhook_secret
string | null

Optional secret for webhook signature verification

Response

Successful Response

​
id
string
required
​
polling_url
string
required
​
cost
number | null

Cost in credits for this request

​
input_mp
number | null

Input megapixels (2 decimal places)

​
output_mp
number | null

Output megapixels (2 decimal places)