This knowledge will live in the proprietary models. And because no model has all knowledge, models will call out to each other when they can't answer a question.
If you can access a models emebeddings then it is possible to retrieve what it knows using a model you have trained
https://arxiv.org/html/2505.12540v2
If you can access a models emebeddings then it is possible to retrieve what it knows using a model you have trained
https://arxiv.org/html/2505.12540v2