Generate an image with FLUX.1 [dev].

Submits an image generation task with FLUX.1 [dev].

POST /v1/flux-dev

Generate an image with FLUX.1 [dev].

cURL

curl --request POST \
  --url https://api.bfl.ai/v1/flux-dev \
  --header 'Content-Type: application/json' \
  --header 'x-key: <api-key>' \
  --data '
{
  "prompt": "ein fantastisches bild",
  "image_prompt": "<string>",
  "width": 1024,
  "height": 768,
  "steps": 28,
  "prompt_upsampling": false,
  "seed": 42,
  "guidance": 3,
  "safety_tolerance": 2,
  "output_format": "jpeg",
  "webhook_url": "<string>",
  "webhook_secret": "<string>"
}
'

200

{
  "id": "<string>",
  "polling_url": "<string>",
  "cost": 123,
  "input_mp": 123,
  "output_mp": 123
}

Authorizations

x-key · string · header · required

Body

application/json

prompt · string · default: ""

Text prompt for image generation.

Example:

"ein fantastisches bild"

image_prompt · string | null

Optional base64 encoded image to use as a prompt for generation.

width · integer · default: 1024

Width of the generated image in pixels. Must be a multiple of 32.

Required range: 256 <= x <= 1440Must be a multiple of 32

height · integer · default: 768

Height of the generated image in pixels. Must be a multiple of 32.

Required range: 256 <= x <= 1440Must be a multiple of 32

steps · integer | null · default: 28

Number of steps for the image generation process.

Required range: 1 <= x <= 50

Example:

28

prompt_upsampling · boolean · default: false

Whether to perform upsampling on the prompt. If active, automatically modifies the prompt for more creative generation.

seed · integer | null

Optional seed for reproducibility.

Example:

42

guidance · number | null · default: 3

Guidance scale for image generation. High guidance scales improve prompt adherence at the cost of reduced realism.

Required range: 1.5 <= x <= 5

Example:

3

safety_tolerance · integer · default: 2

Tolerance level for input and output moderation. Between 0 and 6, 0 being most strict, 6 being least strict.

Required range: 0 <= x <= 6

Example:

2

output_format · enum<string> | null · default: jpeg

Output format for the generated image. Can be 'jpeg', 'png', or 'webp'.

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

200

application/json

Successful Response

AsyncResponse

AsyncWebhookResponse

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)