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Large Language ModelsAI Safety & Alignmentr/MachineLearningPublished: Sep 2, 2026, 22:00 JST

Open-source AI detectors fail 0.5% false-positive test

Open-source AI detectors fail 0.5% false-positive test

A systematic test of six notable open-source AI detectors found that four cannot reliably hit a 0.5% false-positive rate. One model scored over 0.9999 on 26% of ordinary human web text, and the old OpenAI RoBERTa detector performed worse than a coin flip on modern AI text.

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