flux/dev/image-to-image

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

• flux/dev/image-to-image

Try in Playground

Model Overview

A state-of-the-art image generation model that utilizes a 12 billion parameter rectified flow transformer architecture. It is designed to generate high-quality images from textual descriptions, making it a powerful tool for developers and creatives.

Model	Generated image properties
flux/dev/image-to-image	Format: PNG Fixed size: Matches the dimensions of the reference image.

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.

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 · 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.

num_inference_stepsinteger · min: 1 · max: 50Optional

The number of inference steps to perform.

enable_safety_checkerbooleanOptional

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

Default: true

image_urlstring · uriRequired

The URL of the reference image.

strengthnumberOptional

Determines how much the prompt influences the generated image.

Default: 0.95

Responses

200Success

application/json

post

/v1/images/generations

JavaScriptPythoncURLHTTP

async function main() {  const response = await fetch('https://api.aimlapi.com/v1/images/generations', {  method: 'POST',  headers: {  'Authorization': 'Bearer <YOUR_AIMLAPI_KEY>',  'Content-Type': 'application/json',  },  body: JSON.stringify({  "model": "flux/dev/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"  }),  });   const data = await response.json();  console.log(JSON.stringify(data, null, 2)); }  main();

200Success

{  "data": [  {  "url": "https://cdn.aimlapi.com/generations/hedgehog/1749730923700-29fe35d2-4aef-4bc5-a911-6c39884d16a8.png",  "b64_json": null  }  ],  "meta": {  "usage": {  "tokens_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/dev/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",  "strength": 0.8  }  )   data = response.json()  print(json.dumps(data, indent=2, ensure_ascii=False))  if __name__ == "__main__":  main()

JS

Response

{  images: [  {  url: 'https://cdn.aimlapi.com/eagle/files/elephant/RmRsL9NMW_kkRy6MemjZJ_ac9897dd871842e2a689b8bc24b4bf08.jpg',  width: 1472,  height: 512,  content_type: 'image/jpeg'  }  ],  timings: { inference: 4.4450759180035675 },  seed: 3082066483,  has_nsfw_concepts: [ false ],  prompt: 'A T-Rex relaxing on a beach, lying on a sun lounger and wearing sunglasses.' }

Reference Image	Generated Image