Use Seedream 4.0 through Rivya Public API v1 with model id seedream-4-0, supported inputs, parameters, Files API rules, credits, and response examples.

Available via APIText or URL ready; reference modes use Files APIImage

API model id

seedream-4-0

Inputs

text, file

Files API

Required for reference modes

Base credits

Capability

Image

Billing

FIXED

Prompt limit

5000 characters

Request contract

Send the model id at the top level. Model-specific controls belong in params.

Key	Type	Required	Default	Description
model	string	Yes	seedream-4-0	Use the seedream-4-0 API model id.
prompt	string	Yes	-	Maximum 5000 characters for this model.
params	object	No	-	Model-specific parameter object. Use the rows below for allowed keys.
client_request_id	string	No	-	Optional client-side id for tracing requests in your system.

Model parameters

Key	Type	Required	Default	Range	Options	Description
image_size	select	No	square_hd	-	square, square_hd, portrait_4_3, portrait_3_2, portrait_16_9, landscape_4_3, landscape_3_2, landscape_16_9, landscape_21_9	Controls the framing ratio. Together with output resolution, it determines the final pixel dimensions.
image_resolution	select	No	1K	-	1K, 2K, 4K	Current tiers are `1K`, `2K`, and `4K`. Higher resolution usually means larger files and longer waits.
max_images	number	No	1	min 1 / max 6 / step 1	-	Valid values are 1 to 6. It controls how many images one task can return, so it is best to keep your prompt aligned with that count.
seed	number	No	-	min 0 / max 2147483647 / step 1	-	Leave it empty for a new random result each time. Reusing the same integer makes it easier to reproduce or fine-tune a previous result. It stays closer only when the prompt and other key settings also remain similar, and it is not a guaranteed 1:1 match.
nsfw_checker	select	No	false	-	false, true	Controls the content filter. Turning it off gets you closer to the raw output, but also means accepting a weaker safety layer.

Upload policy

Upload reference files first, then place the returned URL and duration token inside params.referenceMediaItems.

Reference rule

Reference images: Upload up to 10 images for the Seedream 4.0 edit path.

Max files

Accepted file kinds

image

Duration token

Video and audio references should carry durationToken from /api/v1/files when duration verification is required.

kind	Max size	MIME types
image	10 MB	image/jpeg, image/png, image/webp

Minimal request

{
  "model": "seedream-4-0",
  "prompt": "A clean editorial product image on a soft studio background",
  "params": {
    "image_size": "square_hd",
    "image_resolution": "1K",
    "max_images": 1,
    "seed": 0,
    "nsfw_checker": "false"
  }
}

Reference-file request

{
  "model": "seedream-4-0",
  "prompt": "A clean editorial product image on a soft studio background",
  "params": {
    "image_size": "square_hd",
    "image_resolution": "1K",
    "max_images": 1,
    "seed": 0,
    "nsfw_checker": "false",
    "referenceMediaItems": [
      {
        "url": "https://cdn.example.com/reference-image.png",
        "kind": "image",
        "name": "reference-image.png",
        "mimeType": "image/png"
      }
    ]
  }
}

Create response

The create endpoint returns a public task id. Poll the status endpoint until the task succeeds or fails.

{
  "id": "task_seedream_4_0_example",
  "status": "queued",
  "model": "seedream-4-0",
  "reserved_credits": 6,
  "final_credits": 0,
  "created_at": "2026-05-11T00:00:00.000Z",
  "updated_at": "2026-05-11T00:00:00.000Z",
  "result": null,
  "error": null
}

Common errors

validation_failed, insufficient_credits, idempotency_conflict, rate_limited, not_found

Some modes require Files API reference uploads.

Seedream 4.0 API Integration