curl --request POST \
  --url https://api.modellix.ai/api/v1/bytedance/seedream-5.0-pro \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "A cinematic sunset over a futuristic city skyline"
}
'

{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-seedream50pro001",
    "model_id": "bytedance/seedream-5.0-pro",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-seedream50pro001"
    }
  }
}

{
  "code": 400,
  "message": "Invalid parameters: parameter 'prompt' is required"
}

{
  "code": 401,
  "message": "Authentication failed: invalid API key"
}

{
  "code": 429,
  "message": "Rate limit exceeded: 100 requests per minute, retry after 60 seconds"
}

{
  "code": 500,
  "message": "Internal server error"
}

Seedream 5.0 Pro

[Core Function] Seedream 5.0 Pro is ByteDance’s flagship professional-grade Text-to-Image (T2I) generation model. [Strengths] It delivers top-tier image quality with enhanced precision control over positions and elements, superior prompt adherence, and improved generation consistency for professional scenarios. [Best For] Highly recommended for: professional design assets, high-fidelity photorealistic imagery, precisely controlled compositions, and brand or commercial visuals where quality matters most. [Limitations] Do NOT use this model for batch image generation or streaming output; it generates exactly one image per request and supports up to 2K resolution (no 3K/4K). [Routing] Choose this Pro model when the user emphasizes ultimate quality or precision. Choose Seedream 5.0 Lite when real-time web knowledge, batch generation, or 3K resolution is needed. To edit an existing image use Seedream 5.0 Pro Edit; to blend multiple reference images use Seedream 5.0 Pro Multi-Reference.

POST

bytedance

seedream-5.0-pro

curl --request POST \
  --url https://api.modellix.ai/api/v1/bytedance/seedream-5.0-pro \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "A cinematic sunset over a futuristic city skyline"
}
'

{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-seedream50pro001",
    "model_id": "bytedance/seedream-5.0-pro",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-seedream50pro001"
    }
  }
}

{
  "code": 400,
  "message": "Invalid parameters: parameter 'prompt' is required"
}

{
  "code": 401,
  "message": "Authentication failed: invalid API key"
}

{
  "code": 429,
  "message": "Rate limit exceeded: 100 requests per minute, retry after 60 seconds"
}

{
  "code": 500,
  "message": "Internal server error"
}

Authorizations

Authorization

string

header

required

API Key authentication. Format: Bearer YOUR_API_KEY.

Body

application/json

prompt

string

required

Image description text, supports Chinese and English. Maximum 10000 characters. We recommend keeping the prompt under 600 words. Excessively long prompts may scatter information, causing the model to overlook details and focus only on major elements, which can result in missing details in the generated image.

Required string length: 1 - 10000

Example:

"A futuristic city at sunset, ultra detailed"

size

string

default:1024x1024

Image size in format 'widthxheight'. Total pixels must be within [1280x720(921,600), 4,624,220] and aspect ratio within [1/16, 16], corresponding to the official 1K/2K resolution levels (3K/4K not supported). Recommended 2K sizes: 2048x2048 (1:1), 2816x1584 (16:9), 2368x1776 (4:3).

Example:

"2048x2048"

optimize_prompt_mode

enum<string>

default:standard

Prompt optimization mode. 'standard': higher quality with longer generation time. 'fast': faster generation with slightly lower quality.

Available options:

standard,

fast

Example:

"standard"

output_format

enum<string>

default:jpeg

Output image format. Supported values: 'jpeg' and 'png'.

Available options:

jpeg,

png

Example:

"png"

Response

Task submitted successfully

code

integer

required

Response code, 0 indicates success

Example:

0

message

string

required

Response message

Example:

"success"

data

object

required

Detailed data about the submitted asynchronous task.

Show child attributes

Seedream 5 0 lite edit Seedream 5 0 pro edit

Model API

Common API

File API

Seedream 5.0 Pro

Authorizations

Body

Response