Stable Diffusion 3 is an advanced text-to-image generation system that rivals or surpasses top-tier systems like DALL-E 3 and Midjourney v6 in terms of layout and prompt following. This system employs a novel Multimodal Diffusion Transformer (MMDiT) architecture, utilizing different weight sets to enhance the representation of both images and language, thereby improving text understanding and spelling ability. The Stable Diffusion 3 API is now available on the Stability AI developer platform, offering fast and reliable API services in collaboration with Fireworks AI. It also promises to release model weights for self-hosting through Stability AI membership in the near future.