ZeroDayBench: Evaluating LLM Agents on Unseen Zero-Day Vulnerabilities for Cyberdefense

Researchers introduced ZeroDayBench, a new benchmark testing LLM agents' ability to find and patch 22 critical vulnerabilities in open-source code. Testing on frontier models GPT-5.2, Claude Sonnet 4.5, and Grok 4.1 revealed that current LLMs cannot yet autonomously solve cybersecurity tasks, highlighting limitations in AI-powered code security.