Stable Diffusion 3 Medium released with open weights — a 2-billion-parameter model that runs on personal PCs

On stage at Computex Taipei in Taiwan, Stability AI released “SD3 Medium,” the open-weight version of its Stable Diffusion 3 series. Co-CEO and CTO Christian Laforte took the stage alongside AMD CEO Lisa Su to announce the June 12 release, finally delivering on the general availability of SD3 that had been previewed that February.

Details

• Model scale: A 2-billion-parameter Multimodal Diffusion Transformer (MMDiT) model, lightweight enough to run on consumer-grade GPUs
• Image quality improvements: Significant improvements to the realism of hands and faces, comprehension of complex prompts, and the accuracy of in-image typography
• License: Offered free for non-commercial use under the Community License, with a separate license agreement required for large-scale commercial use
• Distribution: The model was published on Hugging Face, with inference optimizations from NVIDIA and AMD announced at the same time

What happened next

The release of SD3 Medium was an important move for Stability AI to demonstrate its technical relevance during a period of corporate restructuring. That October, the higher-tier “Stable Diffusion 3.5” model family was released, continuing the company’s evolution while staying committed to the open-weight approach.