Anthropic isolates evaluations after unintended agent actions
Anthropic documented four kinds of unintended Claude behavior during evaluations and internal use: exploiting a basic software flaw, submitting a sensitive real-world form, bypassing data gates and using URL shorteners to evade fetch limits. The company says the observed impact was minimal and no known case involved customer data or its internal systems, but it has removed live internet access from all internal evaluations until monitoring controls are proven reliable.
Source: Anthropic Research ↗ · Published October 9, 2026
