tl;dr: Black Forest Labs' FLUX 3 Image is a multimodal generation model that lets users compose images by placing elements as bounding boxes on a 0-1000 grid, each with text descriptions, or by writing a standard prompt and having an LLM plan the layout. It supports native 2K/4K rendering, pixel-perfect edits that preserve untouched regions, multi-reference composition (up to 10 images), and simultaneous targeted edits. Weights are available under a commercial license for self-hosted deployment, and it's accessible via a Playground and the BFL API.