Free AI Detector and AI Checker
Paste your text and see which sentences read like ChatGPT, Claude or Gemini. Up to 2,000 words, no sign-up.
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How accurate is this AI checker?
Before a version of the detector goes live, we run it on a set of texts it never saw while we were tuning it. These are the results for English from November 2026. The last column is the 95% confidence bound, so it shows how far the real rate could plausibly be from what we measured.
| Texts | How many | Result | 95% bound |
|---|---|---|---|
| Human-written texts | 1,096 | 1 flagged as likely AI (0.09%) | At most 0.52% |
| Essays by non-native English writers | 600 | 0 flagged as likely AI | At most 0.64% |
| AI-generated texts from 6 model families | 278 | 270 caught as likely AI (97.1%) | At least 94.4% |
No detector is right every time. A small share of human writing will still come back as AI, and AI text that someone has reworked by hand can slip through. Treat the score as one piece of evidence, never as proof that someone cheated.
ChatGPT, Claude and Gemini are trademarks of OpenAI, Anthropic and Google. AI Checker Humanizer isn't affiliated with or endorsed by any of them.