OpenBSD包含了一些在其他操作系统缺少或是选择性的安全功能，此外OpenBSD极度重视程式码的品质，任何对核心的修改都需要经过严格的程 式码审阅。OpenBSD可以在17种不同的硬件环境下运作，包含DEC Alpha、Intel i386、Hewlett-Packard PA-RISC、AMD64、Motorola 68000、PowerPC、Sun SPARC等。
4.6 provides significant improvements, including new features, in nearly all areas of the system: new or extended platforms - MVME141 and MVME165 boards are now supported, SGI Octane, SGI Origin 200 and SGI Fuel systems are now supported, several bugs in interrupt handling have been fixed
下载地址：
i386/install46.iso (232MB, SHA256, torrent)
amd64/install46.iso (254MB, SHA256).