It is strongly recommended to reboot after each system update, therefore the low number:
root@omnios:~# uname -a
SunOS omnios 5.11 omnios-r151056-1acbca4f5bd i86pc i386 i86pc
root@omnios:~# uptime
05:54:48 up 14 day(s), 13:50, 1 user, load average: 0,23, 0,23, 0,22
root@omnios:~#