Flux Kontext Max image-to-image

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

• flux/kontext-max/image-to-image

Try in Playground

Model Overview

An image-to-image model that modifies only what the prompt instructs, leaving the rest of the image untouched.

Model	Properties of Generated Images
flux/kontext-max/image-to-image	Format: JPEG, PNG Image size can't be set directly — only a preset aspect ratio can be chosen. Default aspect ratio and size: 16:9, 1184x880 (well, not quite 16:9)

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

modelstring · enumRequiredPossible values:

promptstring · max: 4000Required

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

num_imagesnumber · min: 1 · max: 4Optional

Number of image variations to generate. Each image is a different attempt to combine the reference images (from the image_url parameter) according to the prompt.

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 · min: 1 · 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.

safety_tolerancestring · enumOptional

The safety tolerance level for the generated image. 1 being the most strict and 5 being the most permissive.

Default: 2Possible values:

output_formatstring · enumOptional

The format of the generated image.

Default: jpegPossible values:

aspect_ratiostring · enumOptional

The aspect ratio of the generated image.

Default: 16:9Possible values:

image_urlany ofRequired

One or more image URLs used as visual references. The model merges them into a single image following the prompt instructions.

string · uriOptional

or

string · uri[] · max: 4Optional

Responses

200Success

application/json

post/v1/images/generations

curl -L \
  --request POST \
  --url 'https://api.aimlapi.com/v1/images/generations' \
  --header 'Authorization: Bearer <YOUR_AIMLAPI_KEY>' \
  --header 'Content-Type: application/json' \
  --data '{
      "model": "flux/kontext-max/image-to-image",
      "prompt": "Add a crown to the T-rex’s head.",
      "image_url": "https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/t-rex.png"
    }'

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 a new image using the one from the flux/dev Quick Example as a reference — and make a simple change to it with a 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={
            "model": "flux/kontext-max/image-to-image",
            "image_url": "https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/t-rex.png",  # URL of the reference picture
            "prompt": "Add a bird to the foreground of the photo.",
        }
    )

    data = response.json()
    print(json.dumps(data, indent=2, ensure_ascii=False))

if __name__ == "__main__":
    main()

JS

const response = await fetch('https://api.aimlapi.com/v1/images/generations', {
  method: 'POST',
  headers: {
    // Insert your AIML API Key instead of <YOUR_AIMLAPI_KEY>:
    'Authorization': 'Bearer <YOUR_AIMLAPI_KEY>',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model: 'flux/kontext-max/image-to-image',
    prompt: 'Add a bird to the foreground of the photo.',
    image_url: 'https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/t-rex.png',        
  }),
});

const data = await response.json();
console.log(JSON.stringify(data, null, 2));

Response

{
  "images": [
    {
      "url": "https://cdn.aimlapi.com/squirrel/files/rabbit/4LZOccB3ChjGNDi3G8zTK_202357995b8642f5b7c73925cc388b3d.jpg",
      "content_type": "image/jpeg",
      "file_name": null,
      "file_size": null,
      "width": 1184,
      "height": 880
    }
  ],
  "timings": {},
  "seed": 1415518620,
  "has_nsfw_concepts": [
    false
  ],
  "prompt": "Add a bird to the foreground of the photo."
}

Reference Image	Generated Image

More generated images

Example #2: Combine two images

This time, we’ll pass two images to the model: our dinosaur and a solid blue mug. We'll ask the model to place the dinosaur onto the mug as a print.

Our input images

Python

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

# URLs of two reference pictures
images = ["https://zovi0.github.io/public_misc/flux-dev-t-rex.png", "https://zovi0.github.io/public_misc/blue-mug.jpg"]

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": "Place this image with the t-rex on this mug from the second image as a print. Make it look fit and natural.",
            "model": "flux/kontext-max/image-to-image",
            "image_url": images 
        }
    )

    data = response.json()
    print(json.dumps(data, indent=2, ensure_ascii=False))


if __name__ == "__main__":
    main()

JS

const main = async () => {
  const response = await fetch('https://api.aimlapi.com/v1/images/generations', {
    method: 'POST',
    headers: {
      Authorization: 'Bearer <YOUR_API_KEY>',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      model: 'flux/kontext-max/text-to-image',
      prompt: 'Place this image with the t-rex on this mug from the second image as a print. Make it look fit and natural.',
      image_url: ['https://zovi0.github.io/public_misc/flux-dev-t-rex.png', 'https://zovi0.github.io/public_misc/blue-mug.jpg'],
    }),
  }).then((res) => res.json());

  console.log(response);
};

main();

Response

{
  "images": [
    {
      "url": "https://cdn.aimlapi.com/squirrel/files/zebra/DIXc328YCO52TIo5WEhXM_560d09b975e34c1498ebba71bf0e4eb6.jpg",
      "width": 1184,
      "height": 880,
      "content_type": "image/jpeg"
    }
  ],
  "timings": {},
  "seed": 2103864242,
  "has_nsfw_concepts": [
    false
  ],
  "prompt": "Place this image with the t-rex on this mug from the second image as a print. Make it look fit and natural."
}

"Place this image with the t-rex on this mug from the second image as a print. Make it look fit and natural."