What is Stable Diffusion?
Stable Diffusion is Stability AI's open image-model family, offered through downloadable model licences and Stability AI's hosted developer platform.
Core offerings
- Stable Image Core and Ultra generation services.
- Stable Diffusion 3.5 Large, Turbo, Medium and Flash APIs.
- Image editing, control, 3D and Stable Audio services.
- Self-hosted licensing for eligible organisations.
Pricing
Stability AI's hosted API uses credits, with one credit equal to US$0.01 and 25 free credits for new accounts. Current examples include Stable Image Core at three credits, Ultra at eight, Stable Diffusion 3.5 Large at 6.5, Large Turbo at four, Medium at 3.5 and Flash at 2.5 credits per successful generation.
API and model availability
The API Cost page lists all 17 current services on Stability AI's official rate card. Stable Diffusion 3.0 endpoints, Stable Video Diffusion and Stable Diffusion 1.6 are excluded because Stability AI marks them deprecated or discontinued.
Why select Stable Diffusion?
Stable Diffusion remains attractive when open-model flexibility and a hosted API with clear credit costs are both important.
Official sources: Stability API pricing, API reference, release notes.