Comment by BoppreH

  [Mythos 5] does sometimes still engage in reckless
  or destructive actions in service of a user’s goals,
  and our interpretability analyses indicate that it
  is aware that these actions are transgressive while
  it engages in them. As with Opus 4.8, rates of
  evaluation awareness and reasoning about being graded
  are significant, and not always verbalized; we
  introduce new and more detailed measurements of the
  nature of this awareness. The reasoning text from
  Mythos 5 is somewhat denser and more difficult to
  interpret than that of prior models, containing
  more jargon and difficult language.

So, it (often) knows when it's being tested while hiding that fact, is willing to break rules, is great at hacking, and it's getting harder to understand what it's thinking.

Humanity has plenty of catastrophic risks to deal with already, I wish my field was not working hard to add a new one.