The LPEs were not found with Mythos but with existing, publicly available models.

And also: they did an earlier run with Opus to discover bugs (like segfaults).

In February, Opus discovered a whole bunch of security related bugs, but didn’t exploit them.

Mythos, in turn, was fed these bugs and told to exploit them.

Not saying it’s not impressive, but it was literally told “here are all the places our metal detector says there may be gold, please find gold”.