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AI detector scores measure text patterns, not authorship; require context and supporting evidence.
Perplexity's guide explains how AI detectors work, covering classifiers, perplexity and burstiness, and why detection scores do not prove authorship.
It notes that scores reflect the text and the evaluating system, and that different detectors can reach different conclusions about the same passage.
From the source
Perplexity and burstiness describe patterns in a passage. Those patterns may help explain why text was flagged, but they cannot establish who wrote it.
perplexity.ai