A model that was introduced a few days ago that's LLM-based, but instead of producing text, you can ask it questions and it will return decisions. The key thing being that it responds pretty quickly and predictably.
Site: https://typesafe.ai/blog/introducing-system-one-models-and-j...
It's a closed model and they claim that it's not LLM-based, so I'm not sure why you are claiming that it is LLM-based.