Stable Diffusion 3.5 Medium and Large
Stable Diffusion 3.5 comes in a 2.5B Medium model on the MMDiT-X architecture and a Large model producing high-resolution images with fine detail.
- Stability
- 2 variants
- From $0.035 per run
- Price
- See price
- Speed
- ~8s
- Best for
- Text to Image
- Price
- See price
- Speed
- ~8s
- Best for
- Text to Image
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More from Stability.
A family groups the versions of one model line. Open one to compare its variants side by side.
Working with Stable Diffusion.
Stable Diffusion 3.5 is offered here in two sizes. Medium is the 2.5-billion-parameter model built on the improved MMDiT-X architecture; Large generates high-resolution images with fine detail and, thanks to query-key normalisation, produces diverse outputs from the same prompt.
When to choose Stable Diffusion
Choose Stable Diffusion when you want the open, widely documented baseline that most community tooling assumes. Flux and SDXL are the neighbouring open families with different strengths.
Choosing between the variants
Medium is the cheaper, faster model and enough for most prompts. Large is the one for high-resolution work and for when you want several genuinely different takes on one prompt.
Questions about Stable Diffusion
The short answers. For anything specific to your setup, talk to our team.
Talk to an engineerPlan for your expected volume.2.5 billion parameters, built on the improved MMDiT-X architecture introduced with the 3.5 release.
Query-key normalisation in its architecture produces more diverse outputs from the same prompt rather than near-identical repeats.
Both handle a wide range, but Large holds fine detail better at high resolution, which shows most in complex illustrative work.