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.
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 →
Sources & further reading +
- Official Stable Image API reference ↗
- Stable Assistant model description ↗
- Stability acceptable-use policy, effective 30 September 2026 ↗
- Stability: Ultra and Core service descriptions ↗
Last checked 5 October 2026.