This is why all of the claims that "Claude broke containment" are pure hype. They know how to truly design a secure box. They just don't want to and put out headlines to boast its hacking skills.
You want it secure for experimental model security testing?
- No VMs
- Physical hardware
- Physically disconnected from the internet
For the rest of us who ain't doing that shit, a properly segregated dev network with firewalled access will suffice.