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AI Detector Test — Results Workbook
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FieldValue
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ArticleWhat Is the Most Accurate AI Detector in 2026? (Tested & Ranked)
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AuthorChristian Perry — CEO, Undetectable AI
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Test windowApril 28 – May 26, 2026
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Date used for log2026-05-24 (single-session run, incognito, same browser)
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Detectors testedGPTZero, Undetectable AI, Originality.ai, Copyleaks, QuillBot
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Sample count18 passages (300+ words each)
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Total scans90 (5 detectors × 18 passages)
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Sample breakdown6 raw AI + 6 humanized AI + 4 human (2 native EN, 2 ESL) + 2 mixed (~60/40, human-majority)
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Raw-AI modelsChatGPT (GPT-5.5), Claude Sonnet 4.6, Gemini 3.5 Flash — default settings, no prompt tricks
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HumanizerGrammarly AI Humanizer (one pass per AI sample)
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Ground-truth coding12 AI (S01–S12) + 6 Human (S13–S18, mixed included)
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