Anthropic said Mythos was too dangerous to release. Then four random guys in a Discord gained access on day one by guessing the URL...

This is pretty insane:
→ Group in a private Discord guessed the endpoint from Anthropic's naming conventions
→ They figured out the… https://t.co/HUxd8pwqEH

— Josh Kale (@JoshKale) April 22, 2026