FLUX 3 Image Klein

FLUX 3 Image Klein is an open-weights image generation and editing model developed by Black Forest Labs, featuring 5.6 billion parameters in its image transformer backbone. Built as a compact counterpart to the full FLUX 3 Image architecture, it supports a wide variety of visual tasks including text-to-image synthesis, multi-reference composition with up to ten images, and pixel-perfect editing through a unified set of weights.

The model introduces native 4K resolution output and advanced spatial control capabilities, such as prompt-based bounding boxes that position elements and isolate edits to specific canvas regions. Distributed under the FLUX Kommunity License, FLUX 3 Image Klein is optimized for consumer hardware, offering both a base variant designed for fine-tuning and LoRA training, and a step-distilled variant for accelerated low-latency inference.