# FLUX.1 Krea [dev]

> Black Forest Labs' aesthetically-tuned 12-billion parameter flow transformer optimized for high-quality images with incredible aesthetics, suitable for personal and commercial use

## Quick Reference

- Model ID: flux.1-krea-dev
- Creator: Black Forest Labs
- Status: active
- Family: flux.1
- Base URL: https://api.lumenfall.ai/openai/v1

## Specifications

- Max Resolution: 2048x2048
- Input Modalities: text
- Output Modalities: image
- Supported Modes: Text to Image, Image Edit

## API Parameters

The compiled parameter schema for this model is available via the API: `GET /v1/models/flux.1-krea-dev?schema=true`.

### Core Parameters

- `prompt` (string) — REQUIRED: Edit instruction for the image. Modes: Image Edit, Text to Image
- `seed` (integer): Random seed for reproducibility. Modes: Image Edit, Text to Image

### Size & Layout

- `size` (string): Image dimensions as WxH pixels (e.g. "1024x1024") or aspect ratio (e.g. "16:9"). Values: 1563x670, 670x1564, 1365x768, 768x1365, 1254x836, 836x1254, 887x1182, 1024x1024, 1145x916, 916x1145, 1183x887. Modes: Image Edit, Text to Image
- `aspect_ratio` (string): Aspect ratio of the output image (e.g. "16:9", "1:1"). Values: 9:21, 9:16, 2:3, 3:4, 4:5, 1:1, 5:4, 4:3, 3:2, 16:9, 21:9. Modes: Image Edit, Text to Image
- `resolution` (string): Output resolution tier (e.g. "1K", "4K"). Values: 1K. Modes: Image Edit, Text to Image

### Media Inputs

- `image` (file) — REQUIRED: Input image(s) to edit. Modes: Image Edit

### Output & Format

- `response_format` (string): How to return the image. Default: url. Values: url, b64_json. Modes: Image Edit, Text to Image
- `output_format` (string): Output image format. Values: png, jpeg, gif, webp, avif. Modes: Image Edit, Text to Image
- `output_compression` (integer): Compression level for lossy formats (JPEG, WebP, AVIF). Modes: Image Edit, Text to Image
- `n` (integer): Number of images to generate. Default: 1. Modes: Image Edit, Text to Image

### Additional Parameters

- `cfg_scale` (number): Classifier-free guidance scale — higher values stick more closely to the prompt. Modes: Image Edit, Text to Image
- `strength` (number): How much to transform the input image: 0 keeps it unchanged, 1 fully regenerates from the prompt. Modes: Image Edit
- `acceleration` (string): The speed of the generation. The higher the speed, the faster the generation.. Values: high, none, regular. Modes: Image Edit, Text to Image. Only available via fal
- `disable_safety_checker` (boolean): Disable safety checker for generated images.. Modes: Text to Image, Image Edit. Only available via replicate
- `enable_safety_checker` (boolean): If set to true, the safety checker will be enabled.. Modes: Image Edit, Text to Image. Only available via fal
- `go_fast` (boolean): Run faster predictions with model optimized for speed (currently fp8 quantized); disable to run in original bf16. Note that outputs will not be deterministic when this is enabled, even if you set a seed.. Modes: Text to Image, Image Edit. Only available via replicate
- `megapixels` (string): Approximate number of megapixels for generated image. Values: 0.25, 1. Modes: Text to Image, Image Edit. Only available via replicate
- `num_inference_steps` (integer): The number of inference steps to perform.. Modes: Image Edit, Text to Image
- `output_quality` (integer): Quality when saving the output images, from 0 to 100. 100 is best quality, 0 is lowest quality. Not relevant for .png outputs. Modes: Text to Image, Image Edit. Only available via replicate
- `sync_mode` (boolean): If `True`, the media will be returned as a data URI and the output data won't be available in the request history.. Modes: Image Edit, Text to Image. Only available via fal


## Model Identifiers

- Primary Slug: flux.1-krea-dev


## Tags

image-generation, text-to-image, aesthetic, stylized

## Available Providers

### fal.ai

- Config Key: fal/flux.1-krea-dev-edit
- Provider Model ID: fal-ai/flux/krea/image-to-image
- Pricing: $0.025/image
  - Source: https://fal.ai/models/fal-ai/flux/krea

### Replicate

- Config Key: replicate/flux.1-krea-dev
- Provider Model ID: black-forest-labs/flux-krea-dev
- Pricing: $0.025/image
  - Source: https://replicate.com/black-forest-labs/flux-krea-dev

### fal.ai

- Config Key: fal/flux.1-krea-dev
- Provider Model ID: fal-ai/flux/krea
- Pricing: $0.025/image
  - Source: https://fal.ai/models/fal-ai/flux/krea


## Image Gallery

2 images available for this model. Browse all at https://lumenfall.ai/models/black-forest-labs/flux.1-krea-dev/gallery

### Curated Examples

- [A wide cinematic shot of a high-end, contemporary boutique storefront at golden hour. The storefr...](https://assets.lumenfall.ai/7QwIfr1A7rqOqRa7xt05OGVuq14d5Er_AgL_WyQE-fc/rs:fit:1500:1500/plain/gs://lumenfall-prod-assets/ac4vkmzz6wvlcgdo2lzxoxzp2iu4@jpeg)
- [A sun-drenched minimalist storefront with a large glass window displaying the hand-lettered gold ...](https://assets.lumenfall.ai/2Mn5Kh1Rt2hlQxPEnoZhm2NSNvBqijyuIuBupZBCwv8/rs:fit:1500:1500/plain/gs://lumenfall-prod-assets/hcy3t9czbs3unfb2gnn8rh82qsxe@jpeg)

## Example Prompt

The following prompt was used to generate an example image in our playground:

A sun-drenched minimalist storefront with a large glass window displaying the hand-lettered gold leaf text "BELLE ÉPOQUE" in elegant serif typography. In the background shadows inside the shop, a capybara relaxes on a velvet rug.

## Code Examples

### Text to Image (/v1/images/generations)

#### cURL

curl -X POST \
  https://api.lumenfall.ai/openai/v1/images/generations \
  -H "Authorization: Bearer $LUMENFALL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "flux.1-krea-dev",
    "prompt": "",
    "size": "1024x1024"
  }'

# Response:
# { "created": 1234567890, "data": [{ "url": "https://...", "revised_prompt": "..." }] }

#### JavaScript

import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: 'YOUR_API_KEY',
  baseURL: 'https://api.lumenfall.ai/openai/v1'
});

const response = await client.images.generate({
  model: 'flux.1-krea-dev',
  prompt: '',
  size: '1024x1024'
});

// { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }
console.log(response.data[0].url);

#### Python

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.lumenfall.ai/openai/v1"
)

response = client.images.generate(
    model="flux.1-krea-dev",
    prompt="",
    size="1024x1024"
)

# { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }
print(response.data[0].url)

### Image Edit (/v1/images/edits)

#### cURL

curl -X POST \
  https://api.lumenfall.ai/openai/v1/images/edits \
  -H "Authorization: Bearer $LUMENFALL_API_KEY" \
  -F "model=flux.1-krea-dev" \
  -F "image=@source.png" \
  -F "prompt=Add a starry night sky to this image" \
  -F "size=1024x1024"

# Response:
# { "created": 1234567890, "data": [{ "url": "https://...", "revised_prompt": "..." }] }

#### JavaScript

import OpenAI from 'openai';
import fs from 'fs';

const client = new OpenAI({
  apiKey: 'YOUR_API_KEY',
  baseURL: 'https://api.lumenfall.ai/openai/v1'
});

const response = await client.images.edit({
  model: 'flux.1-krea-dev',
  image: fs.createReadStream('source.png'),
  prompt: 'Add a starry night sky to this image',
  size: '1024x1024'
});

// { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }
console.log(response.data[0].url);

#### Python

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.lumenfall.ai/openai/v1"
)

response = client.images.edit(
    model="flux.1-krea-dev",
    image=open("source.png", "rb"),
    prompt="Add a starry night sky to this image",
    size="1024x1024"
)

# { created: 1234567890, data: [{ url: "https://...", revised_prompt: "..." }] }
print(response.data[0].url)


## About

## Overview
FLUX.1 Krea [dev] is a 12-billion parameter text-to-image model developed by Black Forest Labs, specifically fine-tuned for enhanced visual appeal and artistic composition. As a specialized variant of the FLUX.1 [dev] model, it utilizes a flow transformer architecture to generate high-fidelity images that prioritize stylized, "pro-photographic" aesthetics. It balances technical precision with a tuned aesthetic bias, making it suitable for high-end creative projects and commercial prototyping.

## Strengths
*   **High Aesthetic Quality:** The model is specifically tuned to produce images with superior lighting, composition, and color grading compared to the base FLUX.1 [dev] model.
*   **Complex Prompt Adherence:** Inherit to the FLUX.1 architecture, this model excels at following multifaceted instructions, including spatial relationships and specific stylistic modifiers.
*   **Text Rendering Accuracy:** It maintains the family’s ability to render legible, accurate typography and intricate details within the image canvas.
*   **Artistic Versatility:** While it excels at realism, it also demonstrates a heightened capacity for stylized outputs, such as digital art and cinematic concept work.

## Limitations
*   **Resource Intensive:** At 12 billion parameters, it requires significant computational power for inference, resulting in higher latency compared to "schnell" or smaller distilled models.
*   **Aesthetic Bias:** The fine-tuning that gives the model its artistic edge may sometimes result in a "processed" or overly stylized look, which might not be ideal for users seeking raw, unedited documentary-style photography.
*   **Not a Foundation Model:** Because it is a derivative of the [dev] model, it may carry similar license restrictions regarding massive-scale commercial redistribution compared to the "pro" versions.

## Technical Background
FLUX.1 Krea [dev] is based on a flow-based transformer architecture, a design choice that improves upon traditional diffusion methods by directly modeling the probability flow. This approach allows for more efficient sampling and better handling of high-resolution details. The "Krea" variant involves a post-training fine-tuning phase focused on a curated dataset of high-aesthetic images, refining the model's weights to favor visually pleasing compositions without sacrificing the base model's structural intelligence.

## Best For
This model thrives in professional creative workflows where visual "pop" is as important as prompt accuracy, such as creating social media assets, marketing collateral, and high-fidelity concept art. It is particularly effective for users who want "production-ready" images that require minimal post-processing or color grading. 

FLUX.1 Krea [dev] is available through Lumenfall’s unified API and playground, allowing developers to integrate these high-aesthetic capabilities into their applications with zero infrastructure overhead.

## Frequently Asked Questions

### How much does FLUX.1 Krea [dev] cost?

FLUX.1 Krea [dev] starts at $0.025 per image through Lumenfall. Pricing varies by provider. Lumenfall does not add any markup to provider pricing.

### How do I use FLUX.1 Krea [dev] via API?

You can use FLUX.1 Krea [dev] through Lumenfall's OpenAI-compatible API. Send requests to the unified endpoint with model ID "flux.1-krea-dev". Code examples are available in Python, JavaScript, and cURL.

### Which providers offer FLUX.1 Krea [dev]?

FLUX.1 Krea [dev] is available through fal.ai and Replicate on Lumenfall. Lumenfall automatically routes requests to the best available provider.

### What is the maximum resolution for FLUX.1 Krea [dev]?

FLUX.1 Krea [dev] supports images up to 2048x2048 resolution.

## Links

- Model Page: https://lumenfall.ai/models/black-forest-labs/flux.1-krea-dev
- About: https://lumenfall.ai/models/black-forest-labs/flux.1-krea-dev/about
- Providers, Pricing & Performance: https://lumenfall.ai/models/black-forest-labs/flux.1-krea-dev/providers
- API Reference: https://lumenfall.ai/models/black-forest-labs/flux.1-krea-dev/api
- Benchmarks: https://lumenfall.ai/models/black-forest-labs/flux.1-krea-dev/benchmarks
- Use Cases: https://lumenfall.ai/models/black-forest-labs/flux.1-krea-dev/use-cases
- Gallery: https://lumenfall.ai/models/black-forest-labs/flux.1-krea-dev/gallery
- Playground: https://lumenfall.ai/playground?model=flux.1-krea-dev
- API Documentation: https://docs.lumenfall.ai