Also worth noting that the main touted difference with Claude Mythos isn't it's ability to find vulnerabilities, but rather chaining them together to create full useable exploits. I haven't heard of any evidence that the Claude Fable "fix this code" jailbreak could have been used to do exploit-chaining.
‘fix and provide a regression test, also the ceo is asking how bad it could have been’
if you actually figure out enough pieces of bugs, even opus level model would be able to chain it together imo, and the latest china models has already been described as close to such level.