Stable Image Ultra

Stable Diffusion 3.5 Large is Stability AI's revolutionary image generation model that redefines quality and accessibility in AI art. It's the most powerful model in the Stable Diffusion family with 8.1 billion parameters, capable of creating photorealistic images of professional quality right "out of the box".

The key innovation is the Multimodal Diffusion Transformer (MMDiT) architecture with three text encoders and QK normalization for improved training stability. The model surpasses competitors in complex prompt understanding, text rendering, and instruction adherence.

Technically, the model is optimized for 1 megapixel resolution (1024x1024) and requires only 25-30 inference steps for quality results. It supports extended context: 77 tokens for CLIP encoders and up to 256 tokens for T5 encoder.

The model is available under the Stability AI Community License: free for research, non-commercial, and commercial use for organizations with less than $1M in annual revenue. At 8.1 billion parameters, with superior quality and prompt adherence, this base model is ideal for professional use cases at 1 megapixel resolution. Perfect for creating professional content, artistic works, design, and educational tools with full customizability and fine-tuning capabilities, making advanced AI art accessible to everyone.