Black Forest Labs has released FLUX 3 Image Klein, a 5.6-billion-parameter open-weights model for generating and editing images. It can also generate images using up to ten reference images.
The model supports native 4K output, pixel-accurate editing and bounding boxes to place elements. These features give users control over both image detail and where elements appear.
Black Forest Labs says FLUX 3 Image Klein earned the highest Elo ratings among open models in its internal testing. The company says it beat the closed models Ideogram V4.5 and its own FLUX.2 [pro]. It also says Klein gained 91 Elo points over FLUX.2 [klein] while using 38 percent fewer parameters than that model’s 9 billion.
An INT8 build runs on GPUs with 8 GB of VRAM
An INT8 build runs on NVIDIA GPUs with 8 GB of VRAM. According to Black Forest Labs, it generates an image in under 9 seconds on an RTX 4070.
The weights use the FLUX Kommunity License, which allows free commercial use by companies making under $5 million annually. Black Forest Labs also offers the model through its API at $0.009 per 1,000 images, a Playground and Hugging Face Spaces. It can run locally through ComfyUI and Diffusers.
LoRA training is available from day one through Ostris AI Toolkit and NVIDIA NeMo AutoModel.
