The Vulnerability Benchmark That Knows What You've Already Read
N-Day-Bench, a new benchmark from Winfunc Research, tests frontier LLMs on finding real vulnerabilities disclosed only after each model's knowledge cutoff — closing the memorization loophole that undermines most security evals. The April 13 run shows GPT-5.4 clearly ahead of the pack, with GLM-5.1 and Claude Opus 4.6 clustered close behind and Gemini 3.1 Pro trailing by 15 points. The methodology is the interesting part.
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