Black Forest Labs releases FLUX 3 Image Klein, a 5.6 billion parameter open weight image model that runs on a single consumer GPU
FLUX 3 Image Klein is here. Open Weights with the quality of a large frontier model. Customizable and fast. 5.6B parameters and runs on a single consumer GPU. Native 4K, bounding boxes, and pixel-perfect editing.
Context
A small open image model that matches larger systems would let developers generate and edit images locally without paying per image to a closed API.
This is a first hand launch post from Black Forest Labs, and the claim of large frontier quality comes from its own internal evaluations. The weights use the FLUX Kommunity License, which its blog says allows free commercial use only for companies with annual revenue under $5M.
Deep dive
On October 15, Black Forest Labs posted: FLUX 3 Image Klein is here. It described open weights with the quality of a large frontier model, customizable and fast, with 5.6 billion parameters, running on a single consumer GPU, and offering native 4K, bounding boxes and pixel perfect editing.
The company's blog says the model handles text to image generation, image editing and composition from up to 10 reference images, sharing core features with the full FLUX 3 Image model. It ships as a base model for fine tuning and a faster distilled model, plus FP8, INT8 and NVFP4 builds developed with Nvidia support. The documentation says it fits on GPUs down to an RTX 3090.
In its own evaluations, Black Forest Labs says Klein ranks first among open models in text to image, multi reference generation and editing, ahead of larger models such as Qwen Image 2.1 and Krea 2, and rates above closed models Ideogram V4.5 and FLUX.2 pro. The Hugging Face card notes the 5.6 billion figure covers the image transformer, with a separate Qwen3 VL text encoder.
The distilled model is also on the company's API, with pricing starting at $0.009 per 1K image.
What to expect next
Watch independent comparisons against Krea 3, Qwen Image and closed models to see whether the internal rankings hold up.
Also watch how quickly the community builds fine tunes and LoRA adapters on the base model, and whether the revenue limit in the FLUX Kommunity License slows adoption by larger companies. Early tests on common gaming GPUs will show whether the speed claims hold on modest hardware at home.