Black Forest Labs releases the FLUX.1 image model family

Three variants at release

Black Forest Labs released FLUX.1 as its first model family on August 1, 2024. The models used a flow-matching architecture combining multimodal and parallel diffusion transformer blocks. The announcement described all three public variants as having 12 billion parameters. [1]

Pro used hosted access; dev supplied guidance-distilled weights for noncommercial applications; schnell supplied weights under Apache 2.0. That spread made local experimentation and hosted product development available through different paths. The company's quality comparisons were its own evaluations, rather than a guarantee for every prompt. [1]