Seedream 4.0 (Text-to-Image)

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

• bytedance/seedream-v4-text-to-image

Try in Playground

Model Overview

Ultra-fast, consistent in character rendering, and matching Gemini 2.5 Flash Image (Nano Banana) in quality.

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:

image_sizeany ofOptional

The size of the generated image.

Default: square_hd

string · enumOptionalPossible values:

or

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.

sync_modebooleanOptional

If set to true, the function will wait for the image to be generated and uploaded before returning the response. This will increase the latency of the function but it allows you to get the image directly in the response without going through the CDN.

Default: false

enable_safety_checkerbooleanOptional

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

Default: true

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

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-v4-text-to-image",
    "prompt": "A T-Rex relaxing on a beach, lying on a sun lounger and wearing sunglasses."
  }'

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={
            "model": "bytedance/seedream-v4-text-to-image",
            "prompt": "A T-Rex relaxing on a beach, lying on a sun lounger and wearing sunglasses.",
            "image_size": {
                "width": 4096,
                "height": 4096
            },
        }
    )

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

if __name__ == "__main__":
    main()

JS

Response

{
  "images": [
    {
      "url": "https://v3b.fal.media/files/b/lion/O0byJzpkMBsjWFUMSRelX_ae55fef23aa54a1cad92c3abdf8f5337.png",
      "content_type": "image/png",
      "file_name": "ae55fef23aa54a1cad92c3abdf8f5337.png",
      "file_size": 3282232,
      "width": null,
      "height": null
    }
  ],
  "seed": 1367947822,
  "data": [
    {
      "url": "https://v3b.fal.media/files/b/lion/O0byJzpkMBsjWFUMSRelX_ae55fef23aa54a1cad92c3abdf8f5337.png",
      "content_type": "image/png",
      "file_name": "ae55fef23aa54a1cad92c3abdf8f5337.png",
      "file_size": 3282232,
      "width": null,
      "height": null
    }
  ],
  "meta": {
    "usage": {
      "tokens_used": 63000
    }
  }
}

We obtained the following 4096x4096 image by running this code example:

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