It probably isn't, at least in terms of security or memory safety. The current models can already sniff out all memory vulnerabilities with relative ease, you can't really beat that.

From what I've read so far it's less about Mythos being much better at tasks in isolation.

Security wise, it's about being able to find and chain multiple vulnerabilities to actually create viable exploits.

So I would imagine that if you were using it for regular software development you may not feel that it's that different unless used in a particular way?