If you are interested in playing with the macOS Tahoe (26) beta without upgrading your daily driver or messing with install partitions you can easily install it to a VM using UTM.
https://danielraffel.me/2025/05/13/running-macos-in-a-vm-on-macos-with-utm/

How to Setup macOS in a VM on macOS with UTM
I've been experimenting with different autonomous agents lately and I’ve started to sandbox them. When something needs to run on macOS, I’ve found UTM to be the easiest way to spin up a lightweight, isolated macOS instance on Apple Silicon.