Yes, but at least a /64 and preferably a /48, last time I checked only /128 was available with is just not reasonable for IPv6!
Discussion
We have now /112 IPV6 subnets
Better, but the recommended minimum is a /64, and ideally a /48 (so you can subnet it into /64 as a customer)
Anything smaller than a /64 and things like SLAAC will break.
Think we might see this offered in the future? And do you also offer dedicated, or just vps?
https://docs.netgate.com/pfsense/en/latest/network/ipv6/subnets.html