This is a misunderstanding of the classes, the classes are how difficult they are to contain. Apollion is something that can’t be contained. Thaumial is something that helps the SCP foundation or helps contain other scps. Keter is something that is extremely hard to contain. Euclid is something that requires a medium amount of effort. Safe is something that requires minimal effort to contain. Neutralised is something that is no longer anomalise. There are many other object classise but these are the most common.

Edit: mistook apollion for archon, fixed the explanation

I hear there’s also Iyov, where containment is believed to be possible but is still just theoretical (like SCP-001-J “The Broke God”, a financially-unstable deity who once tried flying a car into space to evade the IRS)