# Seedream 4.5 API

> Seedream 4.5 — fast, high-fidelity AI image generation & editing.

- **Provider**: ByteDance
- **Model id**: `seedream-4-5-edit`
- **Modality**: image
- **Price**: 3.74 credits

## Overview

Seedream 4.5 is called in two steps: create a generation task, then poll the task until the result is ready.

## Authentication

All requests require a Bearer Token in the request header:

```
Authorization: Bearer YOUR_API_KEY
```

## Create Task

`POST https://you.bot/api/v1/generate`

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| modelId | string | Yes | Model id: `seedream-4-5-edit` |
| input | object | Yes | Input parameters object (see below) |
| callbackUrl | string | No | https URL to receive a signed webhook on completion |

### input object parameters

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| prompt | string | Yes | A text description of the image you want to generate (default: Relight this interior into a cozy loft at golden hour, warm sun raking across exposed brick, dust motes drifting in the air and a soft amber glow pooling on the wooden floor.) |
| image_urls | string[] | Yes | Upload an image file to use as input for the API (image URL) |
| aspect_ratio | string | Yes | Width-height ratio of the image, determining its visual form. (options: 1:1 | 4:3 | 3:4 | 16:9 | 9:16 | 2:3 | 3:2 | 21:9) (default: 1:1) |
| quality | string | Yes | Basic outputs 2K images, while High outputs 4K images. (options: basic | high) (default: basic) |
| nsfw_checker | boolean | No | A configurable parameter. Defaults to true in the Playground. (true/false) (default: true) |

### Request example

```json
{
  "modelId": "seedream-4-5-edit",
  "input": {
    "prompt": "A photorealistic portrait of a red fox in a snowy forest, soft morning light, shallow depth of field, 85mm.",
    "image_urls": [
      "https://example.com/input.jpg"
    ],
    "aspect_ratio": "1:1",
    "quality": "basic",
    "nsfw_checker": true
  }
}
```

### Response example

```json
{
  "taskId": "281e5b0…f39b9",
  "creditsCharged": 24
}
```

## Query Task

`GET https://you.bot/api/v1/task/{taskId}?model=seedream-4-5-edit`

When `state` is `success`, the output is in `resultUrls`: `{ "state": "success", "resultUrls": [ ... ] }`. (Text models return inline in the create response.)

## Error Codes

| Code | Description |
|------|-------------|
| 200 | Request successful |
| 400 | Invalid request parameters |
| 401 | Authentication failed, check API Key |
| 402 | Insufficient account balance |
| 422 | Parameter validation failed |
| 429 | Request rate limit exceeded |
| 500 | Internal server error |