I'm looking for an audited web browser on OpenBSD. As far as I can tell nothing in Ports is audited, so are there any browsers built-in on OpenBSD?
XXXTerm is developed by Marco Peereboom an OpenBSD developer, probably as good as you'll find for graphical browsers security wise in the ports https://opensource.conformal.com/wiki/xxxterm
The answer is 'No'. While Lynx used to be part of the Base Installation, it was removed because of support for 'ancient protocols' bibp, finger, gopher, and news.
You can install it from ports/packages, but there is no web browser actually built-in to the base installation any longer.