GPTZero leans on perplexity and burstiness — it expects human text to be uneven. Originality AI trains a classifier on labeled samples and also checks for AI-paraphrase patterns. That difference shows up in practice: GPTZero often flags clean human writing as AI; Originality is harder to fool but slower and pricier.
Run a draft through a good humanizer and both scores drop — but Originality recovers faster on heavily edited text because it watches style shifts, not just per-sentence randomness. GPTZero is easier to calm with short sentences and varied length.
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