Seedream 4.5 API — 4K Image Generation & Editing

Generate 4K AI images with ByteDance Seedream 4.5 through VicSee API. Text-to-image, image-to-image editing with up to 10 references. 15 credits flat.

Pricing

Mode	Credits	Price (Pro Yearly)	Price (Pro Monthly)
Text to Image	15	$0.090	$0.180
Image to Image	15	$0.090	$0.180

Both 2K (Basic) and 4K (High) quality cost the same 15 credits. Credits are deducted only on successful generation.

Endpoint

POST https://vicsee.com/api/v1/generate

See Authentication for API key setup.

Text to Image

Generate images from text descriptions in up to 4K resolution.

Request Parameters

Parameter	Type	Required	Description
model	string	Yes	`seedream-4-5-text-to-image`
input.prompt	string	Yes	Description of the image to generate (max 3000 chars)
input.aspect_ratio	string	No	`1:1`, `16:9`, `9:16`, `4:3`, `3:4`, `2:3`, `3:2`, `21:9` (default: `1:1`)
input.quality	string	No	`basic` (2K) or `high` (4K) (default: `basic`)

Example Request

curl -X POST https://vicsee.com/api/v1/generate \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedream-4-5-text-to-image",
    "input": {
      "prompt": "A movie poster for a sci-fi film titled ECHO, bold title text at top, cyberpunk cityscape background, dramatic lighting, 4K detail",
      "aspect_ratio": "2:3",
      "quality": "high"
    }
  }'

Image to Image

Edit images using natural language instructions with up to 10 reference images.

Request Parameters

Parameter	Type	Required	Description
model	string	Yes	`seedream-4-5-image-to-image`
input.prompt	string	Yes	Edit instructions in natural language
input.image_urls	string[]	Yes	Array of reference image URLs (1-10 images)
input.aspect_ratio	string	No	`1:1`, `16:9`, `9:16`, `4:3`, `3:4`, `2:3`, `3:2`, `21:9` (default: `1:1`)
input.quality	string	No	`basic` (2K) or `high` (4K) (default: `basic`)

Example Request

curl -X POST https://vicsee.com/api/v1/generate \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedream-4-5-image-to-image",
    "input": {
      "prompt": "Change the background to a tropical beach at sunset, keep the person and their outfit the same",
      "image_urls": ["https://example.com/original-photo.jpg"],
      "quality": "high"
    }
  }'

Response

Success (200)

{
  "success": true,
  "data": {
    "id": "task_abc123xyz",
    "model": "seedream-4-5-text-to-image",
    "status": "pending",
    "creditsUsed": 15,
    "creditsRemaining": 982,
    "createdAt": "2026-02-26T12:00:00Z"
  }
}

Poll for completion using Tasks API.

Task Complete

{
  "taskId": "task_abc123xyz",
  "status": "completed",
  "output": {
    "url": "https://cdn.vicsee.com/outputs/image_xyz.png",
    "width": 4096,
    "height": 4096,
    "format": "png"
  }
}

Notes

4K (High) and 2K (Basic) quality cost the same 15 credits
Supports 8 aspect ratios including 21:9 ultrawide
Image-to-image supports up to 10 reference images
Excellent text rendering for posters, packaging, and signage
Generation time is approximately 10-30 seconds

Seedream 5.0 Lite - Web-grounded generation with visual reasoning, 15 credits
FLUX 2 - Premium photorealistic image generation up to 2K
Z Image - Fast, affordable images at 2 credits

Seedream 4.5

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