What Is Stable Diffusion 3 Medium?
Stable Diffusion 3 Medium is Stability AI’s two-billion-parameter MMDiT checkpoint. It is an important compact member of the SD3 family and exposes the controls many open-model users expect: steps, guidance, a negative prompt, prompt expansion and a deterministic seed.
Stable Diffusion Model Versions
Stable Diffusion 3 Medium
Open weights · 1K
From 2 Credits
Stable Diffusion 3.5 Large
The full 8B SD 3.5 model with negative prompts, CFG and sampling-step control.
- Resolutions: 1K / 2K
- Reference images: not supported
- Modes: Text to Image
- Speed: Balanced
Stable Diffusion 3.5 Large Turbo
The four-step distilled SD 3.5 Large for fast, controllable open-model drafts.
- Resolutions: 1K / 2K
- Reference images: not supported
- Modes: Text to Image
- Speed: Fastest
Stable Diffusion 3.5 Medium
The resource-efficient SD3.5 tier with classic CFG, steps and negative-prompt controls.
- Resolutions: 1K / 2K
- Reference images: not supported
- Modes: Text to Image, Typography
- Speed: Balanced
Stable Diffusion 3 Medium
Stability AI’s two-billion-parameter SD3 checkpoint with typography, negative prompts and familiar diffusion controls.
- Resolutions: 1K
- Reference images: not supported
- Modes: Text to Image, Typography
- Speed: Balanced
Stable Image Ultra
The full classic parameter set: Negative Prompt, Steps, Guidance, Strength.
- Resolutions: 1K / 2K
- Reference images: up to 1
- Modes: Text to Image, Image to Image, Edit Image
- Speed: Balanced
What Is Stable Diffusion 3 Medium Best For?
- Open-weight evaluation
- Typography experiments
- Controlled illustration
- Classic negative-prompt workflows
How to Use Stable Diffusion 3 Medium
- Start with 28 steps and guidance 5.
- Name only concrete exclusions.
- Fix a seed for comparisons.
- Use SD 3.5 when the newer family is more important than checkpoint fidelity.
Stable Diffusion 3 Medium Settings Explained
Guidance
Five is the documented default; extreme values can reduce natural texture.
Prompt Expansion
Disabled by default so the compact checkpoint follows your literal prompt.
The panel above shows only the parameters Stable Diffusion 3 Medium actually supports. Switch versions and unsupported controls disappear rather than sitting there doing nothing.
Stable Diffusion 3 Medium Prompt Examples
Typography portrait
Expressive tiger warrior in full armour before a fabric banner reading “OPEN / SOURCE”, dramatic painterly battlefield light
Graphic still life
Four geometric glass vessels on cobalt plinths, precise studio reflections, modern design magazine cover, clean negative space
Stable Diffusion 3 Medium Test Results
Testing in progress
Every model runs the same eight-category prompt set — portrait, product, poster text, anime character, interior, multi-reference, image editing and character consistency — recording generation time, success rate, text accuracy and identity retention. That run has not finished for Stable Diffusion 3 Medium, so this page shows no scores. We do not publish numbers we have not measured.
Stable Diffusion 3 Medium Limitations
- Older than SD 3.5
- Text-to-image only here
- Small exact lettering still needs review
Stable Diffusion 3 Medium Pricing and Credits
Credits scale with resolution and image count. The Generate button always shows what this run costs.
1K
2 credits / image
Failed generations cost 0 credits.
Commercial Use and Image Rights
Open weights are governed by the Stability AI Community License; hosted use also follows the selected service terms.
- Model used: Stable Diffusion 3 Medium
- Model developer: Stability AI
- The inference route is managed internally and may change without changing the selected model
- Uploads are sent only to the configured inference service needed to complete the generation
- You can delete any generation from your history at any time
Frequently Asked Questions
Is this Stable Diffusion 3.5?+
No. This page preserves the exact earlier SD3 Medium checkpoint rather than substituting SD 3.5.
Why include an older checkpoint?+
Named open checkpoints remain useful for reproducibility, comparison and workflows built around their visual character.
Model Updates and Changelog
- 2026-08-25 —— Added the exact Stable Diffusion 3 Medium endpoint and classic control surface.
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