Seedream 4.5

ByteDance Seedream image generation with high resolution and sequential image support

Endpoints

Method	Endpoint	Description
POST	`/api/v1/generateTask/seedream-4-5`	Create generation task
GET	`/api/v1/statusTask/seedream-4-5`	Query task status

Authentication

All requests require an API Key in the header:

Authorization: Bearer YOUR_API_KEY

Request Body

{
  "request_type": "async",
  "callback_url": "https://...",
  "provider": "auto",
  "input": {
    "mode": "text-to-image",
    "prompt": "...",
    "max_images": 4,
    "resolution": "2K",
    "aspect_ratio": "16:9",
    "sequential_image_generation": "disabled",
    "image_urls": ["..."]
  }
}

Parameters

Parameter

Required

Default

Description

request_typestring

—

async

async (polling) or callback (webhook)

callback_urlstring

✱

—

Callback URL, required when request_type=callback

providerstring

—

auto

Routing strategy: auto, value, or official

inputobject

✓

—

Model input parameters

Mode Options:

text-to-image — Generate from text description
image-to-image — Generate with reference images

Sequential Image Generation:

disabled — Generate independent images, no relation between them
auto — Model decides whether to generate sequential/related images based on max_images

Example

Text-to-Image

curl -X POST "https://api.apixo.ai/api/v1/generateTask/seedream-4-5" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "provider": "value",
    "input": {
      "mode": "text-to-image",
      "prompt": "a cozy cyberpunk cafe with neon lights, ultra detailed",
      "max_images": 4,
      "resolution": "2K",
      "aspect_ratio": "16:9",
      "sequential_image_generation": "disabled"
    }
  }'

Image-to-Image (Multiple References)

curl -X POST "https://api.apixo.ai/api/v1/generateTask/seedream-4-5" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "provider": "official",
    "input": {
      "mode": "image-to-image",
      "prompt": "make this scene look like sunrise with warm colors",
      "max_images": 3,
      "resolution": "4K",
      "aspect_ratio": "3:4",
      "sequential_image_generation": "auto",
      "image_urls": [
        "https://example.com/ref1.jpg",
        "https://example.com/ref2.jpg"
      ]
    }
  }'

Response

POST /api/v1/generateTask/seedream-4-5

Returns taskId on success for subsequent status queries.

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Error:

{
  "code": 400,
  "message": "Insufficient credits",
  "data": null
}

GET /api/v1/statusTask/seedream-4-5

Query task execution status and results via taskId.

curl -X GET "https://api.apixo.ai/api/v1/statusTask/seedream-4-5?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://r2.apixo.ai/img1.png\",\"https://r2.apixo.ai/img2.png\",\"https://r2.apixo.ai/img3.png\",\"https://r2.apixo.ai/img4.png\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965652317,
    "costTime": 41388
  }
}

Failed:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "CONTENT_VIOLATION",
    "failMsg": "Content does not meet safety guidelines"
  }
}

Status Response Fields

Field	Type	Description
`taskId`	string	Unique task identifier
`state`	string	`pending` `processing` `success` `failed`
`resultJson`	string	JSON containing `resultUrls` array (on success)
`failCode`	string	Error code (on failure)
`failMsg`	string	Error message (on failure)
`createTime`	integer	Task creation timestamp (ms)
`completeTime`	integer	Task completion timestamp (ms)
`costTime`	integer	Processing duration (ms)

Error Codes

Code	Description
400	Invalid parameters or request error
401	Invalid or missing API Key
429	Rate limit exceeded

Fail Code	Description
`CONTENT_VIOLATION`	Content violates safety guidelines
`INVALID_IMAGE_URL`	Cannot access provided image URL

Rate Limits

Limit	Value
Requests	10000 / minute
Concurrent tasks	1000

Exceeding limits returns 429 error. Wait and retry.

Tips

Generation time:
- 2K resolution: ~25-35 seconds
- 4K resolution: ~40-55 seconds
- Submit task, wait 20 seconds, then poll every 3 seconds
Callback mode: For high-concurrency or high-resolution generation, use callback mode.
Image expiration: Result URLs are valid for 15 days. Download and store important outputs promptly.
Content moderation: Prompts must comply with content safety guidelines. Violations return CONTENT_VIOLATION.
High resolution: Supports up to 4K output, ideal for high-quality printing and professional use.
Batch generation: max_images supports 1-10, generate multiple candidates at once, billed per image.
Sequential images:
- disabled: Generate independent images, no relation
- auto: Intelligently generate sequential images with continuity and coherence
- Sequential mode is ideal for storyboards, comic panels, etc.
Multiple reference fusion:
- image-to-image mode supports up to 14 reference images
- Model intelligently combines style, composition, and color
- More references = richer fusion effects
Resolution selection:
- 2K: Balanced quality and speed, for most scenarios
- 4K: Highest quality, for professional creation and printing
Aspect ratio suggestions:
- 16:9 / 21:9: Landscape, for banners and desktop wallpapers
- 9:16: Portrait, for mobile wallpapers and short video covers
- 1:1: Square, for social media
Image formats: image_urls supports JPG, PNG, WebP, max 10MB per image.

Seedream 4.5

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