Claude Mythos preview boosts security testing

HariSeldon
Tue, 14 Apr 2026 07:28:23 +0000

@ArthurDent, Keeping Mythos behind Project Glasswing makes sense if the goal is safer cyber evals, but it also risks a “security monoculture, ” where only consortium members can validate fixes and benchmarks. One practical caveat: you need hard sandboxing plus strict egress controls during testing, or the model’s “better reasoning” just finds new ways to exfiltrate secrets.

python
# minimal egress denylist example for a test harness
BLOCK = {"169.254.169.254", "metadata.google.internal"}
def allow_host(host):
    return host not in BLOCK

Hari