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

# FLUX.1.1 [pro]

> Call the Black Forest Labs FLUX.1.1 [pro] text-to-image model via the Starrise AI API.

FLUX.1.1 \[pro] is a high-quality text-to-image model from Black Forest Labs, available through Starrise AI. The API uses **synchronous calls** — it directly returns Base64-encoded image data.

## Key Capabilities

* **Text-to-image** — Generate images from text descriptions
* **Flexible sizing** — Specify output resolution via `size` (recommended: `1024x1024`)
* **Reproducible** — Use `seed` for deterministic generation
* **Format options** — supports `jpeg` or `png` output

## Quick Example

<CodeGroup>
  ```bash cURL theme={null}
  curl https://ai.alad.com/v1/images/generations \
    -H "Authorization: Bearer YOUR_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "model": "flux-1.1-pro",
      "prompt": "A cute baby polar bear",
      "size": "1024x1024"
    }'
  ```

  ```python Python theme={null}
  import requests

  response = requests.post(
      "https://ai.alad.com/v1/images/generations",
      headers={"Authorization": "Bearer YOUR_API_KEY"},
      json={
          "model": "flux-1.1-pro",
          "prompt": "A cute baby polar bear",
          "size": "1024x1024"
      }
  )

  result = response.json()
  # result["data"][0]["b64_json"] contains the Base64-encoded image
  ```
</CodeGroup>

## Parameters

| Parameter       | Type    | Required | Description                                     |
| --------------- | ------- | -------- | ----------------------------------------------- |
| `model`         | string  | Yes      | Fixed value: `flux-1.1-pro`                     |
| `prompt`        | string  | Yes      | Text description for the image                  |
| `n`             | integer | No       | Number of images to generate (1–4), default `1` |
| `size`          | string  | No       | Output resolution, e.g. `1024x1024`             |
| `output_format` | string  | No       | `jpeg` or `png`                                 |
| `seed`          | integer | No       | Random seed for reproducibility                 |

## Response Fields

| Field             | Description               |
| ----------------- | ------------------------- |
| `data[].b64_json` | Base64-encoded image data |
| `created`         | Creation timestamp        |

<Card title="API Reference" icon="code" href="/en/api-reference/model-api/blackforestlabs/flux-1-1-pro">
  View the interactive API Playground for FLUX.1.1 \[pro].
</Card>