![]() ![]() ![]() It had the highest overall accuracy score at 84%, did not incorrectly label any human text as AI-generated, and detected every GPT-4 text. Winston AI stood out as the best tool we tested in terms of accuracy. Doesn’t detect use of paraphrasing tools.Costs $18 a month (after a free trial of 2,000 words or one week).Detects highest proportion of edited AI texts and 100% of GPT-4 texts.The most accurate detection out of all the tools we tested.Educators using these tools should bear in mind that they are relatively easy to get around and can sometimes produce false positives. Overall, AI detectors shouldn’t be treated as absolute proof that a text is AI-generated, but they can provide an indication in combination with other evidence. While most detectors show a percentage, they are often binary in their judgments-showing close to 100% or close to 0% in most cases, even when a text is about half-and-half.AI texts on specialist topics seem slightly harder to detect than those on general topics (57% vs.Of the tools we tested, only Originality detected this in more than half of cases (60%). AI detectors generally don’t detect the use of paraphrasing tools on human-written text.Winston AI does best with them but still finds only 60%. AI texts that have been combined with human text or paraphrased are hard to detect.However, most tools do still detect GPT-4 texts in some cases. GPT-4 texts were generally harder to detect than GPT-3.5 texts.Four of the 10 tools we tested had a false positive, including one of the overall best tools, Originality. False positives (human-written texts flagged as AI) do happen.We also observed some other interesting trends: Only the premium tools we tested surpassed 70% accuracy the best free tool, Sapling, scored 68%. The companies behind some tools make strong claims about their reliability, but those claims are not supported by our testing. In general, our research showed that because of how AI detectors work, they can never provide 100% accuracy. ![]()
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