---
title: FLUX.1.1 [pro] | Runware Docs
url: https://runware.ai/docs/models/bfl-flux-1-1-pro
description: FLUX.1.1 Pro high fidelity text to image generation
---
# FLUX.1.1 [pro]

FLUX.1.1 Pro is a flagship text to image model from Black Forest Labs. It improves on FLUX.1 with sharper detail, stronger prompt adherence, and faster sampling. Ideal for production image pipelines, product visuals, and creative tools that require consistent high quality output.

- **ID**: `bfl:2@1`
- **Status**: live
- **Creator**: Black Forest Labs
- **Release Date**: October 2, 2024
- **Capabilities**: Text to Image, Image to Image

## Pricing

- **1k**: `$0.04`

## Compatibility & Validation

`width` and `height` must be used together.

## Request Parameters

**API Options**

Platform-level options for task execution and delivery.

### [taskType](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-tasktype)

- **Type**: `string`
- **Required**: true
- **Value**: `imageInference`

Identifier for the type of task being performed

### [taskUUID](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-taskuuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID v4 identifier for tracking tasks and matching async responses. Must be unique per task.

### [outputType](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-outputtype)

- **Type**: `string`
- **Default**: `URL`

Image output type.

**Allowed values**: `URL` `base64Data` `dataURI`

### [outputFormat](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-outputformat)

- **Type**: `string`
- **Default**: `JPG`

Specifies the file format of the generated output. The available values depend on the task type and the specific model's capabilities.

- \`JPG\`: Best for photorealistic images with smaller file sizes (no transparency).
- \`PNG\`: Lossless compression, supports high quality and transparency (alpha channel).
- \`WEBP\`: Modern format providing superior compression and transparency support.

> [!NOTE]
> \*\*Transparency\*\*: If you are using features like background removal or LayerDiffuse that require transparency, you must select a format that supports an alpha channel (e.g., \`PNG\`, \`WEBP\`, \`TIFF\`). \`JPG\` does not support transparency.

**Allowed values**: `JPG` `PNG` `WEBP`

### [outputQuality](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-outputquality)

- **Type**: `integer`
- **Min**: `20`
- **Max**: `99`
- **Default**: `95`

Compression quality of the output. Higher values preserve quality but increase file size.

### [webhookURL](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-webhookurl)

- **Type**: `string`
- **Format**: `URI`

Specifies a webhook URL where JSON responses will be sent via HTTP POST when generation tasks complete. For batch requests with multiple results, each completed item triggers a separate webhook call as it becomes available.

**Learn more** (1 resource):

- [Webhooks](https://runware.ai/docs/platform/webhooks) (platform)

### [deliveryMethod](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-deliverymethod)

- **Type**: `string`
- **Default**: `sync`

Determines how the API delivers task results.

**Allowed values**:

- `sync` Returns complete results directly in the API response.
- `async` Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse.

**Learn more** (1 resource):

- [Task Polling](https://runware.ai/docs/platform/task-polling) (platform)

### [uploadEndpoint](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-uploadendpoint)

- **Type**: `string`
- **Format**: `URI`

Specifies a URL where the generated content will be automatically uploaded using the HTTP PUT method. The raw binary data of the media file is sent directly as the request body. For secure uploads to cloud storage, use presigned URLs that include temporary authentication credentials.

**Common use cases:**

- **Cloud storage**: Upload directly to S3 buckets, Google Cloud Storage, or Azure Blob Storage using presigned URLs.
- **CDN integration**: Upload to content delivery networks for immediate distribution.

```text
// S3 presigned URL for secure upload
https://your-bucket.s3.amazonaws.com/generated/content.mp4?X-Amz-Signature=abc123&X-Amz-Expires=3600

// Google Cloud Storage presigned URL
https://storage.googleapis.com/your-bucket/content.jpg?X-Goog-Signature=xyz789

// Custom storage endpoint
https://storage.example.com/uploads/generated-image.jpg
```

The content data will be sent as the request body to the specified URL when generation is complete.

### [safety](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-safety)

- **Path**: `safety.checkContent`
- **Type**: `object (2 properties)`

Content safety checking configuration for image generation.

#### [checkContent](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-safety-checkcontent)

- **Path**: `safety.checkContent`
- **Type**: `boolean`
- **Default**: `false`

Enable or disable content safety checking. When enabled, defaults to `fast` mode.

#### [mode](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-safety-mode)

- **Path**: `safety.mode`
- **Type**: `string`
- **Default**: `none`

Safety checking mode for image generation.

**Allowed values**:

- `none` Disables checking.
- `fast` Performs a single check.

### [ttl](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-ttl)

- **Type**: `integer`
- **Min**: `60`

Time-to-live (TTL) in seconds for generated content. Only applies when `outputType` is `URL`.

### [includeCost](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-includecost)

- **Type**: `boolean`
- **Default**: `false`

Include task cost in the response.

### [numberResults](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-numberresults)

- **Type**: `integer`
- **Min**: `1`
- **Max**: `20`
- **Default**: `1`

Number of results to generate. Each result uses a different seed, producing variations of the same parameters.

**Generation Parameters**

Core parameters for controlling the generated content.

### [model](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-model)

- **Type**: `string`
- **Required**: true
- **Value**: `bfl:2@1`

Identifier of the model to use for generation.

**Learn more** (3 resources):

- [Text To Image: Model Selection The Foundation Of Generation](https://runware.ai/docs/guides/text-to-image#model-selection-the-foundation-of-generation) (guide)
- [Image Inpainting: Model Specialized Inpainting Models](https://runware.ai/docs/guides/image-inpainting#model-specialized-inpainting-models) (guide)
- [Image Outpainting: Other Critical Parameters](https://runware.ai/docs/guides/image-outpainting#other-critical-parameters) (guide)

### [positivePrompt](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-positiveprompt)

- **Type**: `string`
- **Required**: true
- **Min**: `2`
- **Max**: `3000`

Text prompt describing elements to include in the generated output.

**Learn more** (2 resources):

- [Text To Image: Prompts Guiding The Generation](https://runware.ai/docs/guides/text-to-image#prompts-guiding-the-generation) (guide)
- [Image Outpainting: Other Critical Parameters](https://runware.ai/docs/guides/image-outpainting#other-critical-parameters) (guide)

### [width](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-width)

- **Type**: `integer`
- **Required**: true
- **Min**: `256`
- **Max**: `1440`
- **Step**: `32`

Width of the generated media in pixels.

**Learn more** (2 resources):

- [Image To Image: Dimensions Changing Aspect Ratio](https://runware.ai/docs/guides/image-to-image#dimensions-changing-aspect-ratio) (guide)
- [Image Outpainting: Dimensions Critical For Outpainting](https://runware.ai/docs/guides/image-outpainting#dimensions-critical-for-outpainting) (guide)

### [height](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-height)

- **Type**: `integer`
- **Required**: true
- **Min**: `256`
- **Max**: `1440`
- **Step**: `32`

Height of the generated media in pixels.

**Learn more** (2 resources):

- [Image To Image: Dimensions Changing Aspect Ratio](https://runware.ai/docs/guides/image-to-image#dimensions-changing-aspect-ratio) (guide)
- [Image Outpainting: Dimensions Critical For Outpainting](https://runware.ai/docs/guides/image-outpainting#dimensions-critical-for-outpainting) (guide)

### [seed](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-seed)

- **Type**: `integer`
- **Min**: `0`
- **Max**: `9223372036854776000`

Random seed for reproducible generation. When not provided, a random seed is generated in the unsigned 32-bit range.

**Learn more** (1 resource):

- [Text To Image: Seed Controlling Randomness Deterministically](https://runware.ai/docs/guides/text-to-image#seed-controlling-randomness-deterministically) (guide)

**Provider Settings**

Parameters specific to this model provider. These must be nested inside the \`providerSettings.bfl\` object.

### [promptUpsampling](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-providersettings-bfl-promptupsampling)

- **Path**: `providerSettings.bfl.promptUpsampling`
- **Type**: `boolean`
- **Default**: `false`

Enable automatic enhancement and expansion of the input prompt.

### [safetyTolerance](https://runware.ai/docs/models/bfl-flux-1-1-pro#request-providersettings-bfl-safetytolerance)

- **Path**: `providerSettings.bfl.safetyTolerance`
- **Type**: `integer`
- **Min**: `0`
- **Max**: `6`
- **Default**: `2`

Tolerance level for content moderation. Lower values are stricter; higher values are more permissive.

## Response Parameters

### [taskType](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-tasktype)

- **Type**: `string`
- **Required**: true
- **Value**: `imageInference`

Type of the task.

### [taskUUID](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-taskuuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID of the task.

### [imageUUID](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-imageuuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID of the output image.

### [imageURL](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-imageurl)

- **Type**: `string`
- **Format**: `URI`

URL of the output image.

### [imageBase64Data](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-imagebase64data)

- **Type**: `string`

Base64-encoded image data.

### [imageDataURI](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-imagedatauri)

- **Type**: `string`
- **Format**: `URI`

Data URI of the output image.

### [seed](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-seed)

- **Type**: `integer`

The seed used for generation. If none was provided, shows the randomly generated seed.

### [NSFWContent](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-nsfwcontent)

- **Type**: `boolean`

Flag indicating if NSFW content was detected.

### [cost](https://runware.ai/docs/models/bfl-flux-1-1-pro#response-cost)

- **Type**: `float`

Task cost in USD. Present when `includeCost` is set to `true` in the request.

## Examples

### Velvet Canopy Library Barge (Text to Image)

![Velvet Canopy Library Barge](https://assets.runware.ai/examples/bfl-flux-1-1-pro/c1871d41-6663-40fa-a6c9-d49eb77fd81e.jpg)

**Request**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "d75835ee-cbcd-436e-87d8-1ea7af3d3983",
  "model": "bfl:2@1",
  "positivePrompt": "An opulent floating library barge drifting through a narrow canal in an old storybook city, viewed at golden hour, carved walnut hull shaped with elegant scrollwork, layered velvet canopies in deep plum and amber, towering bookshelves secured with brass rails, stacks of weathered atlases and illustrated manuscripts, paper charms fluttering from ropes, caged songbirds, hanging lanterns casting warm reflections across the water, ivy-covered stone bridges overhead, curious cats lounging on piles of books, a scholarly heron perched at the prow, highly detailed textures, cinematic composition, crisp focus, atmospheric depth, luxurious color harmony, whimsical realism, ultra-sharp detail",
  "width": 1024,
  "height": 768,
  "seed": 74910,
  "providerSettings": {
    "bfl": {
      "promptUpsampling": true,
      "safetyTolerance": 2
    }
  }
}
```

**Response**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "d75835ee-cbcd-436e-87d8-1ea7af3d3983",
  "imageUUID": "2c1f74aa-0543-4ae3-a205-889716f65f8d",
  "imageURL": "https://im.runware.ai/image/os/a11d13/ws/2/ii/2c1f74aa-0543-4ae3-a205-889716f65f8d.jpg",
  "seed": 74910,
  "cost": 0.04
}
```

---

### Stormglass Conservatory Cliffside Banquet (Text to Image)

![Stormglass Conservatory Cliffside Banquet](https://assets.runware.ai/examples/bfl-flux-1-1-pro/cac89b19-ef1a-40bf-a413-f8625ca47ee3.jpg)

**Request**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "3b136564-4db5-4f78-a34d-bb6c7b7cc6dc",
  "model": "bfl:2@1",
  "positivePrompt": "A lavish banquet set inside a vast stormglass conservatory built into a sheer ocean cliff, towering curved glass panes streaked with rain, forked lightning over dark waves, long table of gleaming copper and porcelain dishes, unusual fruits, sculpted breads, crystalline desserts, elegant guests in windswept formal attire, florals pinned by the gale, candle flames bending in the draft, wet stone floor reflecting gold light, distant seabirds circling outside, ultra-detailed materials, precise anatomy, layered depth, dramatic wide-angle composition, cinematic realism, sharp textures, natural color contrast, atmospheric tension, premium editorial photography look",
  "width": 1344,
  "height": 768,
  "seed": 7626,
  "providerSettings": {
    "bfl": {
      "promptUpsampling": true,
      "safetyTolerance": 2
    }
  }
}
```

**Response**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "3b136564-4db5-4f78-a34d-bb6c7b7cc6dc",
  "imageUUID": "66ebf01b-865c-4d0c-8cd3-d6483f2038ad",
  "imageURL": "https://im.runware.ai/image/os/a05d22/ws/2/ii/66ebf01b-865c-4d0c-8cd3-d6483f2038ad.jpg",
  "seed": 7626,
  "cost": 0.04
}
```

---

### Copper Koi Teahouse Atrium (Text to Image)

![Copper Koi Teahouse Atrium](https://assets.runware.ai/examples/bfl-flux-1-1-pro/cd4be66b-8a21-40d8-81c3-e221d850725c.jpg)

**Request**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "72da4387-9380-4c69-a7c8-14e659d9975a",
  "model": "bfl:2@1",
  "positivePrompt": "A grand open-air teahouse atrium built inside a colossal repurposed rain cistern, ringed by carved cedar balconies and suspended silk canopies, a shallow circular pool filled with oversized copper-and-ivory koi gliding through mirrored water, polished stone walkways crossing the pool in elegant arcs, steam drifting from tiny ceramic cups on low lacquered tables, hanging lanterns with amber paper shades casting warm reflections, guests in eclectic contemporary formalwear mixed with traditional textiles, lush ferns and moss climbing damp masonry, intricate tilework in jade, rust, cream, and charcoal, visible droplets on old metal beams, cinematic composition, ultra-detailed surfaces, sharp focus, rich textures, realistic water reflections, volumetric light rays from the opening above, refined color harmony, premium editorial photography look",
  "width": 1216,
  "height": 832,
  "seed": 64789,
  "providerSettings": {
    "bfl": {
      "promptUpsampling": true,
      "safetyTolerance": 2
    }
  }
}
```

**Response**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "72da4387-9380-4c69-a7c8-14e659d9975a",
  "imageUUID": "d59d9f14-974a-4dd0-bf81-ed5621eb4197",
  "imageURL": "https://im.runware.ai/image/os/a04d20/ws/2/ii/d59d9f14-974a-4dd0-bf81-ed5621eb4197.jpg",
  "seed": 64789,
  "cost": 0.04
}
```

---

### Volcanic Glass Violin Workshop (Text to Image)

![Volcanic Glass Violin Workshop](https://assets.runware.ai/examples/bfl-flux-1-1-pro/a0ebcf24-dfae-4f60-ad13-e93aced4870c.jpg)

**Request**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "b832f607-655c-42f1-ad50-cb329e585260",
  "model": "bfl:2@1",
  "positivePrompt": "An artisan workshop carved into a volcanic cavern, centered on a master luthier shaping a violin from translucent black glass and ember-red crystal, thin ribbons of heat rising from the workbench, shelves of half-finished string instruments, polished obsidian tools, glowing furnace vents in the rock wall, fine ash drifting in the air, dramatic rim lighting, ultra-detailed textures, realistic reflections and refractions, cinematic composition, depth-rich environment, elegant craftsmanship, warm firelight against cool stone shadows, premium editorial photography look, exceptionally sharp detail",
  "width": 1024,
  "height": 768,
  "seed": 70851,
  "providerSettings": {
    "bfl": {
      "promptUpsampling": true,
      "safetyTolerance": 2
    }
  }
}
```

**Response**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "b832f607-655c-42f1-ad50-cb329e585260",
  "imageUUID": "0e40d259-24f1-46e5-9502-b5ad5e064237",
  "imageURL": "https://im.runware.ai/image/os/a23d05/ws/2/ii/0e40d259-24f1-46e5-9502-b5ad5e064237.jpg",
  "seed": 70851,
  "cost": 0.04
}
```

---

### Glasshouse Tea Dragon Nook (Text to Image)

![Glasshouse Tea Dragon Nook](https://assets.runware.ai/examples/bfl-flux-1-1-pro/ed6bc3b3-18f2-42c7-990a-cdc4fbe4ee38.jpg)

**Request**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "5c7a9c23-6866-4003-93b9-d3f52e15111b",
  "model": "bfl:2@1",
  "positivePrompt": "A cozy fantasy reading nook inside a towering Victorian glasshouse filled with rain-speckled panes, hanging ferns, tiled floors, brass plant labels, and curling steam from delicate porcelain teacups. At the center, a small jade-scaled tea dragon sleeps in a nest of embroidered cushions beside an open book and a silver tray of tiny pastries. Warm amber lanterns reflect in the glass, while giant tropical leaves frame the scene and distant vines fade into soft atmospheric depth. Highly detailed textures, crisp focus on the dragon and tea service, elegant composition, whimsical yet believable design, natural color harmony, cinematic lighting, premium editorial quality.",
  "width": 1024,
  "height": 1280,
  "seed": 61157,
  "providerSettings": {
    "bfl": {
      "promptUpsampling": true,
      "safetyTolerance": 2
    }
  }
}
```

**Response**:

```json
{
  "taskType": "imageInference",
  "taskUUID": "5c7a9c23-6866-4003-93b9-d3f52e15111b",
  "imageUUID": "19cecd8f-e261-4269-953a-0063f8dbd905",
  "imageURL": "https://im.runware.ai/image/os/a16d07/ws/2/ii/19cecd8f-e261-4269-953a-0063f8dbd905.jpg",
  "seed": 61157,
  "cost": 0.04
}
```