Is fine-tuning SAM3 only accessible for Enterprise members?

I am interested in using the beta fine-tuning SAM3 on custom data, is this only available for Enterprise users, or if I pay for a Core plan is this sort of thing possible?

I reached out about an Enterprise plan (in case one was needed), however was informed that not all messages receive callback. In this case I was wondering how I may go about accessing the SAM3 fine-tuning model.

Thanks so much!