Seedream-4.5 Image Generation

Advanced image generation model with support for text-to-image, image-to-image, and multi-image reference capabilities

POST /api/generate/submit

cURL

seedream-4-5

curl --request POST \
  --url https://api.poyo.ai/api/generate/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "seedream-4.5",
  "callback_url": "https://your-domain.com/callback",
  "input": {
    "prompt": "A serene Japanese garden with cherry blossoms and a koi pond",
    "size": "16:9",
    "n": 1
  }
}
'

200

{
  "code": 200,
  "data": {
    "task_id": "task-unified-1757165031-uyujaw3d",
    "status": "not_started",
    "created_time": "2025-11-12T10:30:00"
  }
}

1. After submission, a task_id will be returned. If you provided a callback_url, when the task status becomes finished or failed, a POST request will be sent to the callback_url.
2. Regardless of whether callback_url is provided, you can retrieve the response result through the unified Query Task Status endpoint.

Seedream-4.5 Image Generation

Seedream-4.5 is an advanced image generation model that supports text-to-image, image-to-image, and image editing with multi-reference capabilities. It delivers high-quality images with flexible aspect ratios and prompt optimization options.

Available Models

• seedream-4.5 - High-quality text-to-image and image-to-image generation
• seedream-4.5-edit - Advanced image editing with multi-image reference support (up to 10 images)

Size Parameter

input.size supports these forms:

• Resolution preset: 2K, 4K
• Ratio preset: 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, 21:9
• Custom string: WIDTHxHEIGHT, for example 1920x4096
• Custom object: { "width": 2304, "height": 3072 }

Custom size is supported in both text-to-image and seedream-4.5-edit.

In edit mode:

• Preset resolutions such as 2K and 4K are handled automatically by the upstream model
• Custom size such as 1920x4096 or { "width": 2304, "height": 3072 } uses the explicit width and height you provide

How to Call

Use the unified submit endpoint: POST /api/generate/submit

Preset size example:

curl --request POST \
  --url https://api.poyo.ai/api/generate/submit \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "seedream-4.5",
    "callback_url": "https://your-domain.com/callback",
    "input": {
      "prompt": "A serene Japanese garden with cherry blossoms and a koi pond",
      "size": "16:9",
      "n": 1
    }
  }'

Custom size example:

curl --request POST \
  --url https://api.poyo.ai/api/generate/submit \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "seedream-4.5",
    "callback_url": "https://your-domain.com/callback",
    "input": {
      "prompt": "Seedream 4.5 API now Available on Poyo.ai",
      "size": "1920x4096",
      "n": 1
    }
  }'

Edit with custom size example:

curl --request POST \
  --url https://api.poyo.ai/api/generate/submit \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "seedream-4.5-edit",
    "callback_url": "https://your-domain.com/callback",
    "input": {
      "prompt": "Transform the scene to a winter wonderland with snow",
      "image_urls": ["https://example.com/reference1.jpg"],
      "size": "1920x4096",
      "n": 1
    }
  }'

Custom size object example:

{
  "model": "seedream-4.5",
  "input": {
    "prompt": "A fashion editorial portrait in a studio",
    "size": {
      "width": 2304,
      "height": 3072
    },
    "n": 1
  }
}

Authorizations

Authorization · string · header · required

All API endpoints require Bearer Token authentication

Get your API Key:

Visit the API Key Management Page to get your API Key

Add it to the request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json

model · enum<string> · required

Seedream-4.5 model identifier

Available options: seedream-4.5, seedream-4.5-edit

input · object · required

Input parameters for generation

Show child attributes

callback_url · string<uri>

Webhook callback URL for result notifications

Example:

"https://your-domain.com/callback"

Response

200

application/json

Task submitted successfully

code · integer · required

HTTP status code

Example:

200

data · object · required

Show child attributes