FLUX 3 Klein Released as Open-Weights Image Model With Native 4K Output

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Black Forest Labs released FLUX 3 Image Klein on October 15, 2026, as an open-weights model under the FLUX Kommunity License. The model has 5.6 billion parameters, supports native 4K output up to about 16 megapixels, and handles text-to-image, editing, and multi-reference generation with up to ten reference images. A 100-image benchmark put it at 84.68, just behind Qwen Image 2.1's 85.72. The author found the distilled 16-step checkpoint generally preferable to the 50-step base model, except for portraits and cases needing maximum detail. The article also outlines seven ComfyUI workflows for using the model.

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