flux-2

This documentation is valid for the following list of our models:

• blackforestlabs/flux-2

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Model Overview

A 4MP photorealistic, production-grade text-to-image generator.

Setup your API Key

If you don’t have an API key for the AI/ML API yet, feel free to use our Quickstart guide.

API Schema

post

Body

application/json

modelstring · enumRequiredPossible values:

promptstring · max: 4000Required

The text prompt describing the content, style, or composition of the image to be generated.

image_sizeany ofOptionalDefault: landscape_4_3

or

string · enumOptional

The size of the generated image.

Possible values:

output_formatstring · enumOptional

The format of the generated image.

Default: pngPossible values:

enable_prompt_expansionbooleanOptional

If set to True, prompt will be upsampled with more details.

Default: true

num_imagesnumber · min: 1 · max: 4Optional

The number of images to generate.

Default: 1

seedinteger · min: 1Optional

The same seed and the same prompt given to the same version of the model will output the same image every time.

guidance_scalenumber · max: 20Optional

The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you.

num_inference_stepsinteger · min: 4 · max: 50Optional

The number of inference steps to perform.

accelerationstring · enumOptional

The speed of the generation. The higher the speed, the faster the generation.

Default: regularPossible values:

enable_safety_checkerbooleanOptional

If set to True, the safety checker will be enabled.

Default: true

Responses

200Success

application/json

post

/v1/images/generations

HTTPcURLJavaScriptPython

POST /v1/images/generations HTTP/1.1
Host: api.aimlapi.com
Content-Type: application/json
Accept: */*
Content-Length: 253

{
  "model": "blackforestlabs/flux-2",
  "prompt": "text",
  "image_size": "landscape_4_3",
  "output_format": "png",
  "enable_prompt_expansion": true,
  "num_images": 1,
  "seed": 1,
  "guidance_scale": 1,
  "num_inference_steps": 1,
  "acceleration": "regular",
  "enable_safety_checker": true
}

200Success

{
  "data": [
    {
      "url": "https://cdn.aimlapi.com/generations/hedgehog/1749730923700-29fe35d2-4aef-4bc5-a911-6c39884d16a8.png",
      "b64_json": null
    }
  ],
  "meta": {
    "usage": {
      "credits_used": 120000
    }
  }
}

Quick Example

Let's generate an image of the specified size using a simple prompt.

Python

import requests
import json  # for getting a structured output with indentation

def main():
    response = requests.post(
        "https://api.aimlapi.com/v1/images/generations",
        headers={
            # Insert your AIML API Key instead of <YOUR_AIMLAPI_KEY>:
            "Authorization": "Bearer <YOUR_AIMLAPI_KEY>",
            "Content-Type": "application/json"
        },
        json={
            "prompt": "A T-Rex relaxing on a beach, lying on a sun lounger and wearing sunglasses.",
            "model": "blackforestlabs/flux-2",
            "image_size": {
                "width": 1472,
                "height": 512 
            }
        }
    )
    
    data = response.json()
    print(json.dumps(data, indent=2, ensure_ascii=False))

if __name__ == "__main__": 
    main()   

JS

Response

{
  "data": [
    {
      "url": "https://cdn.aimlapi.com/flamingo/files/b/0a84799e/1kYzoFE6V9Jx2Rfmmn_4M.png"
    }
  ],
  "meta": {
    "usage": {
      "tokens_used": 25200
    }
  }
}

We obtained the following nice 1472x512 image by running this code example:

"A T-Rex relaxing on a beach, lying on a sun lounger and wearing sunglasses."