> ## Documentation Index
> Fetch the complete documentation index at: https://docs.unifically.com/llms.txt
> Use this file to discover all available pages before exploring further.

# SeeDream 5.5

> Image generation and editing with up to 10 reference images, transparent PNG output and 2K resolution. See parameters and API examples.

Generate images using ByteDance SeeDream 5.5, released in November 2026. Supports text-to-image, image editing with up to 10 reference images, transparent-background output, 8 aspect ratios, and resolution tiers up to 2K. 1K and 1.5K share one price, 2K costs more, and each reference image adds a small charge.

See the whole family: [SeeDream API models](https://unifically.com/models/seedream).

## Model

```
bytedance/seedream-5.5
```

## Parameters

| Parameter | Type | Required | Default | Description |
| - | - | - | - | - |
| `prompt` | string | **Yes** | — | Text prompt describing the desired image |
| `aspect_ratio` | string | No | `"1:1"` | `1:1`, `4:3`, `3:4`, `16:9`, `9:16`, `3:2`, `2:3`, `21:9`. Combined with `resolution` to pick the output pixel size (e.g. 2K + 16:9 → 2624x1472) |
| `image_urls` | string\[] | No | `null` | Reference image URLs for image editing (max 10). Omit for text-to-image. Must be public `https` URLs |
| `resolution` | string | No | `"2K"` | `1K`, `1.5K`, `2K` (case-insensitive) |
| `output_format` | string | No | `"png"` | `jpeg`, `jpg`, `png` |
| `transparent_background` | boolean | No | `false` | Return the subject on a transparent background (PNG with an alpha channel). Requires `output_format` `png` |
| `nsfw_check` | boolean | No | `false` | Check the prompt and input images for NSFW content before generating. Off unless set to `true` |

## Example - Text-to-Image

```bash theme={null}
curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "bytedance/seedream-5.5",
    "input": {
      "prompt": "A ripe red apple on a wooden table, soft window light",
      "aspect_ratio": "16:9",
      "resolution": "2K"
    }
  }'
```

## Example - Image-to-Image

```bash theme={null}
curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "bytedance/seedream-5.5",
    "input": {
      "prompt": "Turn this photo into a watercolor painting",
      "image_urls": [
        "https://example.com/photo.jpg"
      ],
      "resolution": "1K",
      "aspect_ratio": "4:3"
    }
  }'
```

## Example - Transparent Background

```bash theme={null}
curl -X POST https://api.unifically.com/v1/tasks   -H "Content-Type: application/json"   -H "Authorization: Bearer YOUR_API_KEY"   -d '{
    "model": "bytedance/seedream-5.5",
    "input": {
      "prompt": "A single red apple sticker, die-cut, isolated subject",
      "resolution": "1K",
      "transparent_background": true
    }
  }'
```

> [!NOTE]
>
> SeeDream 5.5 generates exactly one image per request. Unknown parameters are rejected, including the `max_sequential_images` and `web_search` parameters available on SeeDream 5.0 Lite. `transparent_background` cannot be combined with `jpeg` output.

## Response

```json theme={null}
{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "9aeaaa15-5a73-472e-9ac0-27beddaa63ba",
    "status": "processing"
  }
}
```

> [!NOTE]
>
> **Volume discounts** are available for almost all models. Reach out at [contact@unifically.com](mailto:contact@unifically.com) to discuss custom pricing.


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