FLUX.3 Image Klein lands in Diffusers with bounding-box layout control

Key points

• One model handles text-to-image and multi-reference image-to-image, plus new bounding-box layout control via JSON regions in the prompt.
• Distilled checkpoint reportedly makes a 1024 x 1024 image in about 2 seconds on an H100.
• NVFP4 and FP8 weights load with from_single_file for smaller GPUs; LoRA training scripts cover text-to-image and editing.
• Ships as a Modular Diffusers pipeline, and the base checkpoint is the one recommended for fine-tuning.

Why it matters for marketers: Content teams can prototype layout-controlled images and train custom LoRAs on open weights, with reported speed figures to plan GPU budgets.