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OpenBSD out of the box is not minimal. As a base install it is more feature full than most linux base installs. It is small yes, but with a lot of high quality network focused services. I could easily run a company backend and network on only what is found in the base install. If I had a good solid group of people I could probably run the frontend on it. (the main thing it lacks is a web browser).

mail, web, routing, tunnels, bgp, dns, hell there is even an ldap server in there for some reason. but no ldap client, which kind of sucks.

To add: it's not just the fact that it's barely running anything that makes it secure, but the things that you do run have effort put into making their codebase secure as well. Such as the various daemons, like httpd.

Also, the code for OpenBSD has been audited for "common" security issues, and hardened against various attack types.

https://www.openbsd.org/security.html