FLUX 3 Image Klein launches with open weights and a 5.6B-parameter model

For developers using its API, BFL offers the distilled model with the same advertised generation and editing features. The company lists launch support for Ostris AI Toolkit, ComfyUI, Diffusers, SGLang Diffusion and vLLM-Omni, alongside Nvidia fine-tuning recipes and deployment optimizations in its release details.

BFL says Klein scored higher than Qwen Image 2.1 in text-to-image and multi-reference generation while costing less in its internal evaluations. That comparison is a company-reported result, not an independently verified assessment of quality or cost.