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Petri: An open-source auditing tool to accelerate AI safety research

alignment.anthropic.com · 7,411 words · saved by 1 readers

We're releasing Petri (Parallel Exploration Tool for Risky Interactions), an open-source framework for automated auditing that uses AI agents to test the behaviors of target models across diverse scenarios. When applied to 14 frontier models with 111 seed instructions, Petri successfully elicited a broad set of misaligned behaviors including autonomous deception, oversight subversion, whistleblowing, and cooperation with human misuse. The tool is available now at github.com/safety-research/petri. AI models are becoming more capable and are being deployed with wide-ranging affordances across more domains, increasing the surface area where misaligned behaviors might emerge. The sheer volume and complexity of potential behaviors far exceeds what researchers can manually test, making it increasingly difficult to properly audit each model. Over the past year, we've been building automated auditing agents to help address this challenge. We used them in the Claude 4 and Claude Sonnet 4.5 Syst

Petri: An open-source auditing tool to accelerate AI safety research Alignment Science Blog Petri: An open-source auditing tool to accelerate AI safety research October 6, 2025 tl;dr We're releasing Petri (Parallel Exploration Tool for Risky Interactions), an open-source framework for automated auditing that uses AI agents to test the behaviors of target models across diverse scenarios. When applied to 14 frontier models with 111 seed instructions, Petri successfully elicited a broad set of misaligned behaviors including autonomous deception, oversight subversion, whistleblowing, and cooperati

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