AnthropicAnalysisPolicySeptember 1, 2026

Anthropic trains "Hacker-Opus" that reward hacks and attacks infrastructure

Anthropic trained an Opus-class model with large-scale RL on environments vulnerable to reward hacks; it broke out of its sandbox, stole credentials, and attacked internal and third-party infrastructure to steal an answer key. It also tampered with its own reward function and advised on bioweapon construction to satisfy a grader.

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