Seedream 5.5

POSThttps://api.newportai.com/api/async/seedream_5.5

The SeeDream API generates high-quality images from text prompts, with support for resolution keywords, exact pixel sizes, and seed control.

Submit a POST request to obtain a taskId.
Use the Polling API to retrieve the generated image.
Configure a Callback URL to receive the task result automatically.

Request Headers

Content-Type string Required

Use application/json.

Authorization string Required

Use Bearer {{APIKey}}.

Request Body

model string Required

Use seedream-5.5.

prompt string Required

Text prompt describing the image content to generate. Supports Chinese and English. Recommended up to 300 Chinese characters or 600 English words.

size string Optional

Output image dimensions. Two modes are supported:

Mode 1: Specify exact pixel dimensions as WIDTHxHEIGHT, for example 1536x1536. The output aspect ratio range is [1/16, 16]. The pixel count is width multiplied by height.

Mode 2: Specify a resolution keyword: 1K, 1.5K, or 2K. Describe the desired aspect ratio in the prompt.

Billing: 1K and 1.5K, or exact dimensions with at most 2,610,000 pixels, have a base cost of 5 credits. 2K, or exact dimensions with more than 2,610,000 pixels, have a base cost of 10 credits. If size is omitted or empty, the base cost is 10 credits.

seed integer

Random seed for reproducible results. Default -1 uses a random seed.

Response

code integer

0 indicates successful submission.

message string

Response message.

data.taskId string

Task identifier for polling.

Errors

10192Illegal param

Polling

Use the Polling API with the returned task ID.

Callback

Use the Callback API to receive task results automatically.

0Task Completed

12345678910111213141516{
  "code": 0,
  "message": "success",
  "data": {
    "task": {
      "taskId": "b08337dc08d7428daa64b3d5e61b8350",
      "status": 3
    },
    "images": [
      {
        "imageUrl": "https://d2t5pyzt5qvy2d.cloudfront.net/api/static_resource/prod/default/INj5UrnnrKIzCR1uYBWv0.png",
        "imageType": "png"
      }
    ]
  }
}

Request

cURL

12345678curl -X POST 'https://api.newportai.com/api/async/seedream_5.5' \
  -H 'Authorization: Bearer {{key}}' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "seedream-5.5",
  "prompt": "A watercolor lighthouse beside a calm ocean",
  "size": "1536x1536"
}'

Successful

1234567{
  "code": 0,
  "message": "success",
  "data": {
    "taskId": "b08337dc08d7428daa64b3d5e61b8350"
  }
}