BFL's 5.6B FLUX 3 Image Klein Outperforms Larger Open and Closed Models

Black Forest Labs has released FLUX 3 Image Klein, a 5.6B parameter open-weights model handling text-to-image, image editing, and multi-reference generation (up to 10 references). It supports native 4K output, pixel-accurate edits, and bounding-box placement control. The model draws on FLUX 3’s cross-modal training across image, video, and audio data to produce outputs that better reflect real-world spatial and physical dynamics. In BFL’s internal benchmarks, Klein ranks first among open-weights models and ahead of closed competitors Ideogram V4.5 and FLUX.2 [pro], while being the smallest parameter count in the comparison (5.6B vs. 7B and 12.9B for rivals). It gains 91 Elo over the prior FLUX.2 [klein] 9B in text-to-image with 38% fewer parameters.