IPv6 static gateway IP problem

Hi I have a VPS with provider that give static IP6 without DHCP. I don't understand how should set it up, nothing I try work, The provider show this info:

IP address:   2a03:118e:202:55::
Subnet:       2a03:118e:202::/64
Gateway:      2a03:118e:202::1

(I alter some numbers +/- just for anonmity but format is still correct)

I don't know how to set this Gateway because OpenBSD say "Network is unreachable":

# ifconfig vio0 inet6 2a03:118e:202:55:: prefixlen 64
# route add -inet6 default 2a03:118e:202::1
add net default: gateway 2a03:118e:202::1: Network is unreachable

I test also autoconf6 and see slaacd get RA, And it put fe80:etc:etc%vio0 route as default. I have disabled PF to be sure, and also tried with single rule: "pass all". Still no IP6 traffic in or out.

So I install Linux to the VPS to test IP6 there - it's normal and works good. It has static setup with "netplan". Here is "ip -6 a" and "ip -6 route show" from Linux:

    inet6 2a03:118e:202:55::/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::6e21:94ff:fe7a:c358/64 scope link proto kernel_ll 
       valid_lft forever preferred_lft forever

2a03:118e:202:55::/64 dev eth0 proto kernel metric 256 pref medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
default via 2a03:118e:202::1: dev eth0 proto static metric 1024 onlink pref medium
default nhid 1211265837 via fe80::5:73ff:fea0:72 dev eth0 proto ra metric 1024 expires 1685sec pref medium

Sorry for linux copy/paste. How can I replicate this for OpenBSD so my IP6 will work?