---
title: "Stable Image Ultra and Core: workflow fit, costs and terms"
description: "Permitted backgrounds and general artwork through a hosted service."
language: en
canonical: https://bestadultgames.io/en/developers/models/stable-image-services
---

[Developers](https://bestadultgames.io/en/developers.md) / [image models](https://bestadultgames.io/en/developers/models?category=image)

service · Documentation reviewed · 5 October 2026

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# Stable Image Ultra and Core

Permitted backgrounds and general artwork through a hosted service.

- **Availability**: available
- **Where it runs**: hosted
- **Costs**: Subscription, credits or metered API billing; check the selected plan.
- **Adult content policy**: restricted

Stable Image Ultra and Core suit teams that want hosted image generation without maintaining local inference infrastructure. Their role in an adult-game pipeline is permitted backgrounds and general artwork; Stability’s policy prohibits content relating to sexual acts. These are metered services with their own access and output-use terms. Ultra’s connection to SD3.5 does not transfer a local checkpoint’s license to the API. Keep the endpoint, request settings and applicable terms with approved images, and allow production time for moderation rejections, correction passes and export preparation.

## Commercial use & license

Proprietary service terms govern access and output use; check them separately from local-model licenses.

## Adult content rules

Stability’s policy prohibits content relating to sexual acts and explicitly covers self-hosted and third-party-hosted technology.

[Read the policy](https://stability.ai/use-policy)

## What you need

Account or API access, rights to any reference images you submit, and a reviewed export workflow.

Ranks are recommendations for the task described, based on reviewed documentation. Model ranks cover non-explicit development work. We have not run practical benchmarks. Check content policies and commercial terms separately. [How the ranks work](https://bestadultgames.io/en/developers/methodology.md)

### Sources & further reading

- [Official Stable Image API reference](https://platform.stability.ai/docs/api-reference)
- [Stable Assistant model description](https://stability.ai/stable-assistant)
- [Stability acceptable-use policy, effective 30 September 2026](https://stability.ai/use-policy)
- [Stability: Ultra and Core service descriptions](https://stability.ai/news-updates/stable-diffusion-35-large-is-now-available-on-microsoft-ai-foundry)

Last checked 5 October 2026.

## Why consider it

- Managed image-generation APIs.
- No local inference infrastructure to maintain.
- Quality-focused Ultra and speed-focused Core options.

## Tradeoffs to plan for

- Service terms need a separate check from local-model licenses.
- Usage fees and moderation filters shape production planning.
- Policy prohibits content relating to sexual acts.

The tier reflects documented fit for the workflow described here and availability. No numeric score or hands-on performance results are provided.

[Compare with other models](https://bestadultgames.io/en/developers/compare?model=stable-image-services)

## Related guides

AI images · Beginner · 5 min read

### [Choose an image model by the asset you need to ship](https://bestadultgames.io/en/developers/guides/choose-image-model-for-game-assets.md)

Choose image models by asset fit, correction work, repeatability, compute and rights before committing a full cast.

Read the guide → A reading priority

AI images · Intermediate · 6 min read

### [Keep AI character art consistent through references and corrections](https://bestadultgames.io/en/developers/guides/ai-character-reference-workflow.md)

Build approved character references, catch identity drift and review expressions, outfits and exported sprites as one consistent set.

Read the guide → A reading priority