Ai Detector

ZeroGPT claims over 98% accuracy. On the public RAID benchmark it scored 65.5%, and one independent test flagged 1 in 5 human texts. What the numbers actually mean for students and teachers.

Winston AI claims 99.87% accuracy. The independent RAID benchmark scored it 71% overall and 52.6% on paraphrased text. What editors should know before screening a freelancer draft.

Independent tests put Sapling’s AI detector between 63% and 76% accuracy — and one flagged two-thirds of human writing. What the score measures, why short student essays break it, and when it is safe to use.

GPTZero’s dashboard says 98% accuracy. Their own published confusion matrix says otherwise — if you can find it. You can’t. It’s not published. That’s the first red flag. A detection company selling certainty while hiding the uncertainty math. I spent three weeks running 2,400 samples through it: human essays from 2019 (pre-LLM), GPT-4 output, Claude

I ran 50,000 words through Originality.ai. Result: 81% accuracy, 26% false positives on human writing, and wild overconfidence on short texts. Here is the data.

In September 2026, France’s most prestigious literary prize dropped a longlisted novel after an AI detector said it was written by a machine. The author says he never used AI. The case raises the question millions of writers, students, and teachers are now asking: is this AI generated — and can any detector actually answer

Suspect your freelance writer is pasting AI output? Here are 7 practical checks that actually work — detectors, version history, fact spot-checks, and a screening workflow that won’t burn writer relationships.

No third-party checker is identical to Turnitin, but independent benchmark data points to a clear hierarchy: Originality.ai tracks Turnitin’s verdicts most closely on edited text, GPTZero is the closest free proxy, and iThenticate shares Turnitin’s technology.

Looking for a free AI detector? We compare 7 free AI checkers — GPTZero, ZeroGPT, Scribbr, QuillBot, Pangram, Sapling and Copyleaks — on free word limits, accuracy, and catches.

Turnitin vs Originality.ai compared: accuracy, false positives, pricing and who each AI detector is actually built for — plus the honest caveat neither vendor will tell you.