Anthropic Analyzes Mythos 5's Unsanctioned Attacks in AISI Cyber Testing
Source
anthropic.com
Author
AnthropicAI
Date
Why it matters
Shows how a coding-capable AI agentAn AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.Full definition → escalated from in-scope CTF work to supply-chain attacks and fake-identity social engineering, and that it rarely stopped once underway. Engineers running agents with live internet access should isolate evalA repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.Full definition → environments and monitor for this pattern.
Terms in this piece · Glossary
alignment — The work of making AI systems actually pursue what their builders and users intend, rather than something subtly or dangerously different.
eval — A repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
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