Imagen 4 Ultra

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

• imagen-4.0-ultra-generate-preview-06-06

Model Overview

Google’s highest quality image generation model as of July 2025. Supports automatic AI prompt enhancement and pre-moderation of generated content.

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

Authorizations

Body

modelundefined · enumRequiredPossible values:

promptstring · max: 400Required

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

convert_base64_to_urlbooleanOptional

If True, the URL to the image will be returned; otherwise, the file will be provided in base64 format.

Default: true

num_imagesinteger · max: 4Optional

The number of images to generate.

Default: 1

seedinteger · max: 4294967295Optional

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

enhance_promptbooleanOptional

Optional parameter to use an LLM-based prompt rewriting feature for higher-quality images that better match the original prompt. Disabling it may affect image quality and prompt alignment.

Default: true

aspect_ratiostring · enumOptional

The aspect ratio of the generated image.

Default: 1:1Possible values:

person_generationstring · enumOptional

Allow generation of people.

Default: allow_adultPossible values:

safety_settingstring · enumOptional

Adds a filter level to safety filtering.

Default: block_medium_and_abovePossible values:

Responses

201

Successfully generated image

application/json

post

HTTPcURLJavaScriptPython

POST /v1/images/generations HTTP/1.1
Host: api.aimlapi.com
Authorization: Bearer <YOUR_AIMLAPI_KEY>
Content-Type: application/json
Accept: */*
Content-Length: 239

{
  "model": "imagen-4.0-ultra-generate-preview-06-06",
  "prompt": "text",
  "convert_base64_to_url": true,
  "num_images": 1,
  "seed": 1,
  "enhance_prompt": true,
  "aspect_ratio": "1:1",
  "person_generation": "allow_adult",
  "safety_setting": "block_medium_and_above"
}

201

Successfully generated image

{
  "status": "text",
  "prompt": [
    "text"
  ],
  "model": "text",
  "model_owner": "text",
  "tags": {
    "ANY_ADDITIONAL_PROPERTY": null
  },
  "num_returns": 1,
  "args": {
    "model": "text",
    "prompt": "text",
    "n": 1,
    "steps": 1,
    "size": "text"
  },
  "subjobs": [],
  "output": {
    "choices": [
      {
        "image_base64": "text"
      }
    ]
  }
}

Quick Example

Let's generate an image of the specified aspect ratio 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": "Racoon eating ice-cream",
            "model": "imagen-4.0-ultra-generate-preview-06-06",
            "aspect_ratio": "16:9"
        }
    )

    response.raise_for_status()
    data = response.json()

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


if __name__ == "__main__":
    main()

JS

async function main() {
  try {
    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({
        prompt: 'Racoon eating ice-cream',
        model: 'imagen-4.0-ultra-generate-preview-06-06',
        aspect_ratio: '16:9'
      }),
    });

    if (!response.ok) {
      throw new Error(`HTTP error! Status: ${response.status}`);
    }

    const data = await response.json();
    console.log('Generation:', data);

  } catch (error) {
    console.error('Error:', error);
  }
}

main();

Response

{
  "data": [
    {
      "mime_type": "image/png",
      "url": "https://cdn.aimlapi.com/generations/guepard/1753091188132-ea2fc805-e828-4afe-82e6-7831a2d4080e.png"
    }
  ]
}

So we obtained the following 1408x768 image by running this code example:

In reality, raccoons shouldn’t be given ice cream or chocolate—it’s harmful to their metabolism. But in the AI world, raccoons party like there’s no tomorrow.