seedream-5.0-lite

Seedream 5.0 Lite text-to-image and image-to-image API.

Use seedream-5-0-lite-260128 with the same synchronous endpoint for single images, image editing, and sequential image generation.

Select the Special-Ns resource group for specific content requests.

Text to image

Create an image

POST /v1/images/generations

cURL

curl --request POST \
  --url https://www.anyfast.ai/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "seedream-5-0-lite-260128",
    "prompt": "Create four coherent storyboard frames showing an astronaut repairing a spacecraft",
    "size": "2K",
    "seed": 42,
    "sequential_image_generation": "auto",
    "sequential_image_generation_options": { "max_images": 4 },
    "response_format": "url",
    "output_format": "png",
    "watermark": false,
    "optimize_prompt_options": { "mode": "standard" }
  }'

model · string · required

Must be seedream-5-0-lite-260128.

prompt · string · required

The image-generation prompt.

size · string

2K, 3K, 4K, or a supported explicit pixel size.

seed · integer

Random seed.

sequential_image_generation · string · default: "disabled"

Use auto for sequential images or disabled for a single image.

sequential_image_generation_options.max_images · integer

Maximum number of sequential images.

response_format · string · default: "url"

url or b64_json. URLs expire after 24 hours.

output_format · string · default: "jpeg"

png or jpeg.

watermark · boolean · default: true

Whether to add an AI-generated watermark.

optimize_prompt_options.mode · string · default: "standard"

Prompt optimization mode.

Image to image

Create an image

POST /v1/images/generations

cURL

curl --request POST \
  --url https://www.anyfast.ai/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "seedream-5-0-lite-260128",
    "prompt": "Replace the outfit in image one with the outfit in image two while preserving identity and pose",
    "image": [
      "https://example.com/person.png",
      "https://example.com/outfit.png"
    ],
    "size": "2K",
    "response_format": "url",
    "output_format": "png",
    "watermark": false
  }'

model · string · required

Must be seedream-5-0-lite-260128.

prompt · string · required

The image-editing instruction.

image · string | string[] · required

An image URL, Base64 data URI, or up to 14 reference images.

size · string

2K, 3K, 4K, or a supported explicit pixel size.

seed · integer

Random seed.

sequential_image_generation · string · default: "disabled"

Use auto for sequential images or disabled for a single image.

sequential_image_generation_options.max_images · integer

Maximum output count. Reference and generated images together must not exceed 15.

response_format · string · default: "url"

url or b64_json. URLs expire after 24 hours.

output_format · string · default: "jpeg"

png or jpeg.

watermark · boolean · default: true

Whether to add an AI-generated watermark.

optimize_prompt_options.mode · string · default: "standard"

Prompt optimization mode.

Supported formats are jpeg, png, webp, bmp, tiff, gif, heic, and heif. Each image must be at most 30 MB, have an aspect ratio in [1/16, 16], have both dimensions greater than 14 px, and contain no more than 36,000,000 pixels.

Headers

Authorization · string · required

Bearer authentication in the form Bearer <token>.

Content-Type · string · default: "application/json" · required

Request body format.

Response

200

{
  "model": "seedream-5-0-lite-260128",
  "created": 1775029815,
  "data": [{
    "url": "https://example.com/generated-image.png",
    "size": "2048x2048"
  }],
  "usage": {
    "generated_images": 1,
    "output_tokens": 16384,
    "total_tokens": 16384
  }
}

model · string

The model ID used for the request.

created · integer

Creation time as a Unix timestamp in seconds.

data · object[]

Generated images.

data[].url · string

Temporary image URL when response_format is url.

data[].b64_json · string

Base64 image data when response_format is b64_json.

data[].size · string

Generated image dimensions.

usage.generated_images · integer

Number of generated images.

usage.output_tokens · integer

Output token count.

usage.total_tokens · integer

Total token count.

Error responses

Error responses use an error object with code, message, and type fields.

error · object

Error information.

error.code · string

Machine-readable error code.

error.message · string

Human-readable error message.

error.type · string

Error category.

400

Invalid request or unsupported parameter value.

{ "error": { "code": "invalid_request_error", "message": "Invalid request parameter", "type": "invalid_request_error" } }

401

Missing or invalid API key.

{ "error": { "code": "unauthorized", "message": "Invalid API key", "type": "authentication_error" } }

429

Rate limit exceeded.

{ "error": { "code": "rate_limit_exceeded", "message": "Rate limit exceeded", "type": "rate_limit_error" } }