FLUX.2 klein 4B open-sourced: 4-step sub-second generation, Apache 2.0

thisdudelikesAI · x · 2026-09-02

Black Forest Labs releases FLUX.2 [klein] 4B, a 4B-parameter rectified flow transformer supporting text-to-image, single-reference edit, and multi-reference edit in one checkpoint. Distilled to 4 steps, it generates in sub-second on modern hardware. Licensed under Apache 2.0 for commercial use, no separate editing model or inpainting workaround needed.

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