This guide shows how to generate images using Seedream 4.0 model via the Leonardo.AI REST API.

Sample Request

curl --request POST \
     --url https://cloud.leonardo.ai/api/rest/v2/generations \
     --header 'accept: application/json' \
     --header 'authorization: Bearer <YOUR_API_KEY>' \
     --header 'content-type: application/json' \
     --data '{
       "model": "seedream-4.0",
       "parameters": {
           "width": 1920,
           "height": 1080,
           "prompt": "Koala with purple wizard hat on a skateboard",
           "quantity": 2,
           "guidances": {
               "image_reference": [
                   {
                       "image": {
                           "id": "YOUR_UPLOADED_IMAGE_ID",
                           "type": "UPLOADED"
                       },
                       "strength": "MID"
                   }
               ]
           },
           "style_ids": [
               "111dc692-d470-4eec-b791-3475abac4c46"
           ]
       },
       "public": false
   }'

Recipe

API Request Endpoint, Headers, Parameters

Endpoint

https://cloud.leonardo.ai/api/rest/v2/generations

Headers

--header "accept: application/json" \
--header "authorization: Bearer <YOUR_API_KEY>" \
--header "content-type: application/json"

Body Parameters

Parameter	Type	Definition
guidances	`object`	Optional. Object defining image guidance inputs that influence the generated result.
guidances.image_reference	`array`	Optional. Array of up to 6 reference images. Each reference includes image.id, image.type (`GENERATED` or `UPLOADED`), and strength (`LOW`, `MID`, `HIGH`).
height	`integer`	Optional. Height input resolution.
model	`string`	Required. Model identifier. Set to `seedream-4.0`.
prompt	`string`	Required. Text prompt describing what image you want the model to generate.
prompt_enhance	`string`	Optional. Enables prompt enhancement when set to `"ON"`; disabled when set to `"OFF"`.
public	`boolean`	Optional. Boolean flag that determines whether the generation is public (`true`) or private (`false`).
quantity	`integer`	Optional. Number of images to generate in a single request.
seed	`integer`	Optional. Apply a fixed seed to maintain consistency across generation sets.
style_ids	`array`	Optional. Array of style UUIDs used to apply preset artistic styles to the output.
width	`integer`	Optional. Width input resolution. Supports `256` to `1440`.

List of Style IDs

Preset Style	UUID
Cinematic	`a5632c7c-ddbb-4e2f-ba34-8456ab3ac436`
Creative	`6fedbf1f-4a17-45ec-84fb-92fe524a29ef`
Dynamic	`111dc692-d470-4eec-b791-3475abac4c46`
Fashion	`594c4a08-a522-4e0e-b7ff-e4dac4b6b622`
Portrait	`ab5a4220-7c42-41e5-a578-eddb9fed3d75`
Stock Photo	`5bdc3f2a-1be6-4d1c-8e77-992a30824a2c`
Vibrant	`dee282d3-891f-4f73-ba02-7f8131e5541b`