FLUX 3 Klein Runs on 8 GB VRAM in ComfyUI, but the Upsampler Adds 9.8 GB

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Black Forest Labs' FLUX 3 Image Klein, released October 15, 2026, can run locally in ComfyUI on an 8 GB card such as the RTX 3070, though the required prompt upsampler is itself a 9.8 GB file. The full int8 download totals about 20.8 GB of weights, which ComfyUI loads in stages and moves to system RAM when not in use. The model comes in a distilled checkpoint for generation and editing and an undistilled Base checkpoint for fine-tuning, each requiring different settings. BFL recommends always using the upsampler, since short prompts produce generic output, and the author estimates 32 GB of system RAM as a practical minimum. The article also notes that the company's reported Elo gains are internal evaluations not yet independently verified.

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