Seedream 4.5

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

• bytedance/seedream-4-5

Try in Playground

Model Overview

The model combines both text-to-image and image-to-image capabilities. Compared to Seedream 4.0, this model significantly improves editing consistency (preserving subject details, lighting, and color tone), the quality of portraits and small text.

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:

promptstringRequired

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

image_urlsstring · uri[] · min: 1 · max: 14Optional

List of URLs or local Base64 encoded images to edit.

image_sizeany ofOptional

The size of the generated image.

or

string · enumOptionalPossible values:

response_formatstring · enumOptional

The format in which the generated images are returned.

Default: urlPossible values:

seedintegerOptional

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

watermarkbooleanOptional

Add an invisible watermark to the generated images.

Default: false

Responses

200Success

application/json

post

/v1/images/generations

cURLJavaScriptPython

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": "bytedance/seedream-4-5",
      "prompt": "Combine the images so the T-Rex is wearing a business suit, sitting in a cozy small café, drinking from the mug. Blur the background slightly to create a bokeh effect.",
      "image_urls": [
        "https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/t-rex.png",
        "https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/blue-mug.jpg"
      ]
    }'

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": "bytedance/seedream-4-5",
            "prompt": "Combine the images so the T-Rex is wearing a business suit, sitting in a cozy small café, drinking from the mug. Blur the background slightly to create a bokeh effect.",
            "image_urls": [
                "https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/t-rex.png",
                "https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/blue-mug.jpg"
            ]
        }
    )

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

if __name__ == "__main__":
    main()

JS

Response

{
  "data": [
    {
      "url": "https://cdn.aimlapi.com/bison/seedream-4-5/02176522545211712014becacfaf8a37949eaec3c8139753caaae_0.jpeg?X-Tos-Algorithm=TOS4-HMAC-SHA256&X-Tos-Credential=AKLTYWJkZTExNjA1ZDUyNDc3YzhjNTM5OGIyNjBhNDcyOTQ%2F20251208%2Fap-southeast-1%2Ftos%2Frequest&X-Tos-Date=20251208T202437Z&X-Tos-Expires=86400&X-Tos-Signature=9be05c928d39a74abc5c06bff5759a28449256d72f1d062933479f279bc672cb&X-Tos-SignedHeaders=host",
      "size": "2048x2048"
    }
  ],
  "meta": {
    "usage": {
      "credits_used": 84000
    }
  }
}

Reference Images	Generated Image