MODEL ID bfl:2@1

live

FLUX.1.1 [pro]

by Black Forest Labs October 2, 2024

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.

API Options

Platform-level options for task execution and delivery.

taskType string required value: imageInference: Identifier for the type of task being performed

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

outputType string default: URL: Image output type.

Allowed values 3 values

outputFormat 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.

**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 3 values

outputQuality integer min: 20 max: 99 default: 95: Compression quality of the output. Higher values preserve quality but increase file size.

webhookURL string 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
PLATFORM

deliveryMethod string default: sync

Determines how the API delivers task results.

Allowed values 2 values

: Returns complete results directly in the API response.
: Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse.

Learn more 1 resource

Task Polling
PLATFORM

uploadEndpoint string 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.

// 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 object

Content safety checking configuration for image generation.

Properties 2 properties

safety » checkContent checkContent boolean default: false: Enable or disable content safety checking. When enabled, defaults to fast mode.

safety » mode mode string default: none

Safety checking mode for image generation.

Allowed values 2 values

: Disables checking.
: Performs a single check.

ttl integer min: 60: Time-to-live (TTL) in seconds for generated content. Only applies when outputType is URL.

includeCost boolean default: false: Include task cost in the response.

numberResults 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 string required value: bfl:2@1

Identifier of the model to use for generation.

Learn more 3 resources

positivePrompt string required min: 2 max: 3000

Text prompt describing elements to include in the generated output.

Learn more 2 resources

width integer required min: 256 max: 1440 step: 32

Width of the generated media in pixels.

Learn more 2 resources

height integer required min: 256 max: 1440 step: 32

Height of the generated media in pixels.

Learn more 2 resources

seed 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
GUIDE

Provider Settings

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

providerSettings » bfl » promptUpsampling promptUpsampling boolean default: false: Enable automatic enhancement and expansion of the input prompt.

providerSettings » bfl » safetyTolerance safetyTolerance integer min: 0 max: 6 default: 2: Tolerance level for content moderation. Lower values are stricter; higher values are more permissive.

taskType string required value: imageInference: Type of the task.

taskUUID string required UUID v4: UUID of the task.

imageUUID string required UUID v4: UUID of the output image.

imageURL string URI: URL of the output image.

imageBase64Data string: Base64-encoded image data.

imageDataURI string URI: Data URI of the output image.

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

NSFWContent boolean: Flag indicating if NSFW content was detected.

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

Text to Image

Velvet Canopy Library Barge

Request

{
  "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

{
  "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
}

Text to Image

Stormglass Conservatory Cliffside Banquet

Request

{
  "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

{
  "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
}

Text to Image

Copper Koi Teahouse Atrium

Request

{
  "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

{
  "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
}

Text to Image

Volcanic Glass Violin Workshop

Request

{
  "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

{
  "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
}

Text to Image

Glasshouse Tea Dragon Nook

Request

{
  "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

{
  "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
}