Mythos is Coming: What the Next Six Months Require
Summary: The UK AI Security Institute found that Anthropic's Claude Mythos Preview can autonomously execute a complete corporate network takeover, succeeding in 30% of attempts on a complex attack range, a task AISI estimates would take a human expert roughly 20 hours. Early testing of OpenAI's GPT 5.5 shows CTF performance close to or slightly superior to Mythos, and the article argues offensive AI is compressing the attacker's discovery curve.
What you should know: The defender's historical edge was context - knowing which hosts matter and what normal looks like - and that edge only holds if it loads faster than an attacker chain that now moves in seconds, which institutional memory sitting in a senior analyst's head during business hours does not.
Read the original at The Hacker News ↗
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