FLUX.2 [klein] 4B is the fastest model in the FLUX.2 family, a 4-billion-parameter rectified flow transformer capable of sub-second image generation and editing on consumer GPUs with as little as 13GB of VRAM. Despite its compact size, it delivers photorealistic output at up to 4 megapixels with accurate text rendering, coherent spatial relationships, and consistent detail preservation during edits. Released under the Apache 2.0 license, it is designed for real-time applications, rapid creative iteration, and lightweight deployment on accessible hardware.