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What is FLUX.1 Krea?

FLUX.1 Krea [dev] represents a state-of-the-art open-source diffusion transformer boasting 12 billion parameters, collaboratively developed by Krea and Black Forest Labs, and is designed to deliver remarkable aesthetic accuracy and photorealistic results while steering clear of the typical “AI look.” Fully embedded within the FLUX.1-dev ecosystem, this model is based on a foundational framework (flux-dev-raw) that encompasses a vast array of world knowledge. It employs a two-phase post-training strategy that combines supervised fine-tuning using a thoughtfully curated mix of high-quality and synthetic samples, alongside reinforcement learning influenced by human feedback derived from preference data to refine its stylistic outputs. Additionally, through the creative application of negative prompts during pre-training, coupled with specialized loss functions aimed at classifier-free guidance and precise preference labeling, it achieves significant improvements in quality with less than one million examples, all while eliminating the need for complex prompts or supplementary LoRA modules. This innovative methodology not only enhances the quality of the model's outputs but also establishes a new benchmark in the realm of AI-generated visual content, showcasing the potential for future advancements in this dynamic field.

What is Bonsai Image?

The Bonsai Image Ternary 4B MLX 2-bit is a specialized text-to-image diffusion transformer optimized for Apple Silicon, prioritizing high-quality output in its Bonsai Image iteration. By leveraging ternary weights of {−1, 0, +1} alongside FP16 group-wise scaling within its transformer architecture, which includes Q/K/V projections, output projections, and MLP weights, it achieves notable efficiency. This model successfully compresses the FLUX.2 Klein 4B transformer from a hefty 7.75 GB FP16 down to a mere 1.21 GB, resulting in an impressive 6.4× reduction in size while still preserving visual quality and prompt fidelity similar to the original version. The deployment package tailored for Apple Silicon weighs in at 3.88 GB, encompassing the MLX 2-bit diffusion transformer, a 4-bit Qwen3-4B text encoder, and an FP16 Flux2 VAE. Once the text encoder processes the prompt encoding, it is offloaded, ensuring that only the compact transformer and VAE are retained in memory throughout the denoising loop. Additionally, this model incorporates a 4-step FlowMatchEuler sampler with guidance set at 1.0 and a shift of 3.0, effectively eliminating the requirement for CFG and negative prompts, which simplifies the generation process and enhances the overall user experience. Overall, this development marks a noteworthy leap forward in the quest for efficient and high-quality image generation technology, making it accessible for a broader range of applications. Furthermore, the advancements made in this model illustrate the ongoing evolution in the field of machine learning and image synthesis.

Media

Media

Integrations Supported

FLUX.1
Fuser
OpenClaw

Integrations Supported

FLUX.1
Fuser
OpenClaw

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Krea

Date Founded

2022

Company Location

United States

Company Website

www.krea.ai/blog/flux-krea-open-source-release

Company Facts

Organization Name

PrismML

Date Founded

2026

Company Location

United States

Company Website

prismml.com

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