# Stable Image Ultra AI Image Generator

> The full classic parameter set: Negative Prompt, Steps, Guidance, Strength.

Canonical URL: https://allimageai.com/models/stable-image-ultra/

Website: All Image AI

Language: English

If you already work the local Stable Diffusion way — negative prompts, CFG tuning, step counts — this is the lowest-friction move to a hosted model. The classic parameter set is intact and you no longer manage checkpoints or a GPU.

## Model details

- Developer: Stability AI
- Status on All Image AI: Coming soon
- Last verified: 2026-08-20
- Maximum output: 2K
- Modes: Text to Image, Image to Image, Edit Image
- Reference images: up to 1
- Resolutions: 1K, 2K
- Aspect ratios: 1:1, 16:9, 9:16, 4:3, 3:4, 21:9

## Best for

- People fluent in the classic parameters
- Work that needs negative prompts to exclude elements
- Fine-grained image-to-image control
- Stylised illustration

## How to use

1. Select Stable Image Ultra.
2. Write the positive prompt, then open Advanced for the negative prompt.
3. Fix the seed and change one parameter at a time.
4. Upscale to the delivery size.

## Settings explained

### Guidance

The classic CFG. 4 is a reasonable starting point.

### Steps

30 covers most cases; returns fall off quickly after that.

### Negative Prompt

Excluding unwanted elements is one of this model’s most effective controls.

## Prompt examples

### With a negative prompt

> Fantasy forest path at dusk, volumetric light, painterly

Negative Prompt: blurry, watermark, text.

### Image to image

> Repaint this sketch as a finished digital illustration, keep the composition

Set Strength around 0.5.

## Limitations

- 2K ceiling
- Weak in-image text
- Less realistic by default than FLUX.2

## 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 | 3 |

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 licence terms.

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

## Frequently asked questions

### Do the parameters match local SD?

Conceptually yes: Guidance maps to CFG, Steps to sampling steps, Strength to denoising strength.

### Is LoRA supported?

Custom LoRAs are not exposed in this integration.

## Release history and sources

June 5, 2024 — API access opened

This date applies to the event shown. Later API access, weights and availability on All Image AI may have different dates.

- [platform.stability.ai](https://platform.stability.ai/docs/release-notes)

[Event evidence on the timeline](https://allimageai.com/timeline/#event-stable-image-ultra)

## 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 3.5 Medium](https://allimageai.com/models/stable-diffusion-3-5-medium.md): Negative prompt · 2K
- [Stable Diffusion 3 Medium](https://allimageai.com/models/stable-diffusion-3-medium.md): Open weights · 1K