Stability AI Unveils SD4: Photorealistic Image Generation Indistinguishable from Photos

Stable Diffusion 4 introduces a new flow-matching architecture that produces images virtually indistinguishable from photographs in blind tests. The model achieves a 94% realism score in human evaluation studies and includes built-in watermarking using C2PA metadata. SD4 also features precise text rendering and consistent character generation across multiple images.