Flux-2-Klein-9b (generate or edit images)

Official Documentation: https://api.bfl.ml/scalar#tag/models/POST/v1/flux-2-klein-9b
Please refer to the official documentation; all parameters are consistent with it.

We have added the sync parameter to support synchronous return of results for easier debugging. Setting it to true enables synchronous return.

Partial Parameter Description

Parameter Name	Parameter Description
safety_tolerance	Tolerance level for input and output content moderation. Higher levels mean looser moderation restrictions.
webhook_url	URL to receive Webhook notifications for asynchronously obtaining generation results.
webhook_secret	Optional secret key for Webhook signature verification to enhance request security.
steps	Number of iteration steps for image generation. More steps result in richer image details but slower generation speed.
prompt_upsampling	Whether to perform upsampling optimization on prompts to improve prompt understanding accuracy.
guidance	Guidance strength, controlling the alignment between generated results and prompts. Higher values mean higher alignment but lower creativity.
interval	Interval for outputting intermediate results during generation, used to check generation progress.

Functional Features

📝 Text-Driven Generation: Generate high-quality images based on prompts, suitable for various creative scenarios such as artistic creation, product design, and scene rendering.

🖼️ Multi-Image Assisted Creation: Support up to 4 input images for assisted generation, enabling advanced effects like image fusion, style transfer, and content expansion.

⚙️ Highly Customizable Configuration: Support custom image height and output format; flexibly control the strictness of content moderation via the safety tolerance parameter.

📊 Asynchronous Task Management: Return task results asynchronously, including key information such as task ID and polling address for easy task tracking.

API Usage Steps:

Use the generation interface (/flux/v1/flux-2-klein-9b), fill in the corresponding parameters, and obtain the task ID.

Use the query interface (/flux/v1/get_result), enter the task ID to get the result.

💵 Pricing/MP (Mega Pixel):

Generated Images: 0.015 PTC for the first MP; 0.002 PTC per additional MP.

Reference Images: 0.002 PTC per MP.

Supplementary Notes: Resolution is rounded up to the next MP for billing; images exceeding 4MP will be scaled down to 4MP; for multiple reference images, each is counted as at least 1MP.

Request

Header Params

Body Params application/json

Examples

Text-to-imageImage editing

{
  "prompt": "ein fantastisches bild",
  "width": 1024,
  "height": 768,
  "steps": 40,
  "prompt_upsampling": false,
  "seed": 42,
  "guidance": 2.5,
  "safety_tolerance": 2,
  "interval": 2,
  "output_format": "jpeg",
  "sync": false
}

Request Code Samples

Shell

JavaScript

Java

Swift

PHP

Python

HTTP

Objective-C

Ruby

OCaml

Dart

Responses

🟢200OK

application/json

Body

Examples

Example 1Example 2

{
    "id": "5015d102-09e0-44e9-8ede-ab8c74b16ed6",
    "polling_url": "https://api.us3.bfl.ai/v1/get_result?id=5015d102-09e0-44e9-8ede-ab8c74b16ed6",
    "cost": 6.0,
    "input_mp": 0.0,
    "output_mp": 0.75
}

🟠422