Stable Image Ultra
Image modelCard summarizedFlagship image service based on Stable Diffusion 3.5 Large, offering the highest quality and detail
● Re-checked 12 Oct 2026 · 46 facts · 1 correction · 2 unconfirmedSource: Stable Image Ultra API reference and Developer Platform release notes (no model card published for the service)
Where to call it
- Stability AI Platform API
POST /v2beta/stable-image/generate/ultra - Amazon Bedrock
Good for
- Highest-quality images in the Stability API lineup
- Typography and complex compositions
- Dynamic lighting, vibrant hues and overall cohesion and structure
Overview
Image Ultra
Flagship image service based on Stable Diffusion 3.5 Large, offering the highest quality and detail
- Max resolution
- 1 MP (1024×1024; 1536×640 at 21:9)
- Aspect ratios
- 9 options
- Modes
- text-to-image, image-to-image
- Released
- 5 Jun 2024
Stable Image Ultra is Stability AI's flagship hosted text-to-image service, launched on 5 Jun 2024 and powered by Stable Diffusion 3.5 Large since 29 Oct 2024. It returns about 1-megapixel images from a text prompt, optionally guided by an input image, and Stability describes it as strongest in typography, complex compositions, dynamic lighting, vibrant hues and overall cohesion. API reference; release notes
stable-image/generate/ultra- Typical price
- $0.08 / image
- Max resolution
- 1 MP (1024×1024; 1536×640 at 21:9)
- Aspect ratios
- 16:9, 1:1, 21:9, 2:3, 3:2, 4:5, 5:4, 9:16, 9:21
- Weights
- Closed
- Released
- 5 Jun 2024
- text-to-image
- image-to-image