# Stable Diffusion 3.5 Medium AI Generator

> The resource-efficient SD3.5 tier with classic CFG, steps and negative-prompt controls.

Canonical URL: https://allimageai.com/models/stable-diffusion-3-5-medium/

Website: All Image AI

Language: English

Stable Diffusion 3.5 Medium keeps the familiar negative prompt, CFG and step controls in a smaller architecture than the Large edition. It is a practical hosted option for users who want classic diffusion control at a lower 1K cost.

## Model details

- Developer: Stability AI
- Status on All Image AI: Active
- Last verified: 2026-08-25
- Maximum output: 2K
- Modes: Text to Image, Typography
- Reference images: not supported
- Resolutions: 1K, 2K
- Aspect ratios: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3

## Best for

- Classic diffusion workflows
- Negative-prompt control
- Stylised illustration
- Resource-efficient SD3.5 generation

## How to use

1. Start at 1K with 40 steps.
2. Add a concise negative prompt.
3. Fix a seed before tuning CFG.
4. Use 2K only for the chosen composition.

## Settings explained

### Guidance

4.5 is the documented default; reduce it for looser natural images.

### Negative Prompt

A strong way to suppress watermarks, blur and unwanted objects.

## Prompt examples

### Illustration

> Bioluminescent Japanese garden at twilight, floating lanterns, crystalline plants, painterly cinematic depth

### Product render

> Compact field camera on weathered oak, soft north-window light, realistic leather and brushed metal

## Limitations

- Text-to-image only on this route
- 2K costs four times the 1K tier because billing follows pixels
- Large is stronger on intricate scenes

## Pricing and credits

Credits for one image at default quality and mode. Resolution, quality, reference inputs, edit mode and output count can change the total. Check the Generate button before submitting.

| Resolution | Credits / image |
| --- | --- |
| 1K | 2 |
| 2K | 6 |

Failed generations cost 0 credits. Catalog availability does not guarantee runtime availability; the workspace reports whether the selected model can run.

[Credit plans](https://allimageai.com/pricing.md)

## Test results

Testing in progress. No verified benchmark scores have been published for this model.

## Commercial use and image handling

Commercial use is subject to Stability AI’s Stable Diffusion 3.5 licence and the selected service terms.

Uploads are processed by the configured inference service. You can delete a generation from your history.

## Frequently asked questions

### Medium or Large?

Use Medium for inexpensive controlled iteration; use Large when the final needs maximum scene complexity and detail.

### Does it support image-to-image here?

No. This integration exposes the exact Medium text-to-image endpoint only.

## Release history and sources

October 29, 2024 — Open weights released

Medium weights were released on October 29. October 22 is the earlier series announcement and Large-model release.

- [stability.ai](https://stability.ai/news-updates/introducing-stable-diffusion-3-5)

[Event evidence on the timeline](https://allimageai.com/timeline/#event-stable-diffusion-3-5-medium)

## Other versions

- [Stable Diffusion 3.5 Large](https://allimageai.com/models/stable-diffusion-3-5-large.md): Full quality · 2K
- [Stable Diffusion 3.5 Large Turbo](https://allimageai.com/models/stable-diffusion-3-5-large-turbo.md): Fast draft · 2K
- [Stable Diffusion 3 Medium](https://allimageai.com/models/stable-diffusion-3-medium.md): Open weights · 1K
- [Stable Image Ultra](https://allimageai.com/models/stable-image-ultra.md): Recommended · 2K