It's really not the same thing.

Read the cloudflare blog about using Mythos. Mythos is important and notable because of the harness and self-direction. It's not necessarily a way stronger bug finder, but it was trained to do the end to end analysis autonomously, which is a big deal.

To my eyes, the Mythos story is most important as a step toward custom trained harnesses and their effectiveness; there's clearly some sort of plateau we are very close to for some domains where you can just stop getting humans in the loop, radically changing cost, timing and ROI for some tasks.