{"id":9002,"date":"2024-12-03T05:07:30","date_gmt":"2024-12-03T05:07:30","guid":{"rendered":"https:\/\/ampifire.com\/blog\/?p=9002"},"modified":"2025-07-10T03:58:33","modified_gmt":"2025-07-10T03:58:33","slug":"gptzero-vs-zerogpt-review","status":"publish","type":"post","link":"https:\/\/ampifire.com\/blog\/gptzero-vs-zerogpt-review\/","title":{"rendered":"GPTZero vs ZeroGPT AI Detector Mega Test: Best Accuracy & False Positives?"},"content":{"rendered":"\n

Article at-a-glance<\/strong>

– AI detection is unreliable<\/strong> and can cause publishers to create worse content by relying on tools which are inherently innacurate.

– ZeroGPT is more accurate than GPTZero in assessing AI-generated casual content<\/strong>: 95% accuracy in detecting AI (vs. 84% for GPTZero), and 0% AI detection for human content (vs. 3% for GPTZero).

– For other types of human-written content (fiction, informational blog posts, news reports, political speeches), ZeroGPT is significantly less accurate than GPTZero<\/strong> in correctly identifying human content (ZeroGPT assigns 30% AI likelihood, on average, to human content – versus just over 4% for GPTZero).

– Both testers are unreliable<\/strong> and have substantial risks.

– ZeroGPT has a high chance of false positives (30% average AI probability for human copy, with a 50% rate of false positives).

– GPTZero has a high chance of false negatives (41% AI probability on average for AI copy, with a 35% rate of false negatives)<\/p>\n\n\n\n

AI Detector apps and AI content checkers are being increasingly used, from teachers assessing student work (and the students writing said work) to Google itself. <\/p>\n\n\n\n

We selected two of the most popular ones – GPTZero<\/a> and ZeroGPT<\/a> – and tested them on both AI and human copy to see just how accurate they are.<\/p>\n\n\n\n

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Want useful AI detection that instantly highlights AI fluff to fix? Check out ABBA<\/a> (Artificial Bot Babble Auditor). A 100% free tool that checks your content for overused AI phrases and ChatGPT-isms. Quick, simple, way less robotic, and no sign-up needed \u2014 try it for free<\/a><\/em>!<\/strong><\/p><\/blockquote>\n\n\n\n

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Back to our research, the results are occasionally funny – but dispiriting overall.<\/p>\n\n\n\n

Until then, though, you\u2019re probably wondering:<\/p>\n\n\n\n

AI detection is unreliable<\/strong> and can cause publishers to create worse content by relying on tools which are inherently innacurate.<\/em><\/p><\/blockquote><\/figure>\n\n\n\n

How\u2019s that different from other similar tests? <\/strong><\/h2>\n\n\n\n

For one thing, we\u2019re directly comparing two of the most popular AI checkers against a large-ish database of content. <\/p>\n\n\n\n

Most (if not all) AI checker tests were done using the opposite approach \u2013 comparing a large number of testers on a limited number of samples. <\/p>\n\n\n\n

That\u2019s not ideal, though – too little data tends to yield unreliable results (and we\u2019ll show later on how testing on a single piece of content with a single checker is virtually useless). <\/p>\n\n\n\n

Yes, testing the same copy with multiple checkers will show you which of those checkers performs well on that particular copy, but drawing conclusions beyond that isn\u2019t warranted – there\u2019s simply too much variation from test to test.<\/p>\n\n\n\n

We tried to fix that, so we went for a larger database (40 pieces of content in total).<\/p>\n\n\n\n

<\/p>\n\n\n\n

Why GPTZero and ZeroGPT?<\/strong><\/h2>\n\n\n\n

Simply put, because they\u2019re the most popular dedicated AI checkers based on traffic and search visibility (Quillbot\u2019s AI detector<\/a> is up there too, but it\u2019s part of the Quillbot AI-assisted writing package – still worth looking at it and we\u2019ll probably do that in a future piece!). <\/p>\n\n\n\n

They\u2019re also two of the more accurate based on recent testing, with a recent ZDNet test<\/a> rating ZeroGPT and GPTZero as 80% and 100% accurate, respectively, with the competition doing considerably worse.\u00a0Note\u00a0Originality.ai AI Detector<\/a>\u00a0has consistently been shown to be the most accurate AI detector.\u00a0<\/p>\n\n\n\n

Those numbers seem promising, but they don\u2019t really paint the full picture  – and the ZDNet test does warn against relying on them too much. Their results aren\u2019t reliable and will vary from test to test.<\/p>\n\n\n\n

But how much do they vary? Being right occasionally or even \u201cin general\u201d doesn\u2019t work – we wanted to know exactly how reliable (or unreliable) these popular testers are, so we ran a test on just the two of them, with enough copy to help us draw meaningful conclusions.<\/p>\n\n\n\n

<\/p>\n\n\n\n

This is part 1 of a two-part series where we look at AI checkers and testers. In part 2, we tested AI humanizers, DeepL and SurferSEO<\/strong><\/a>. <\/em><\/h5>\n\n\n\n
You can also check the in-depth reviews we did for various AI tools like Shortly AI<\/strong><\/a>, Wordtune<\/strong><\/a>, Jasper AI<\/strong><\/a>, and Outwrite AI<\/strong><\/a>.<\/em><\/h5>\n\n\n\n

<\/p>\n\n\n\n

Here\u2019s what we did:<\/strong><\/h2>\n\n\n\n
  1. Generated the most AI-ish casual blog samples out there – asked Chat GPT-4o for 10 popular blog niches, then asked it to come up with short blog samples on topics of its choice; gave it no style prompt no nothing, fingers crossed that the resulting copy will be as painfully AI as possible (this will be the AI control sample, which we know is 100% AI);<\/li>
  2. Selected
    – short stories from the 1840s-1920s,
    – stories from the 1990s, and
    – political speeches from 1980-2013,
    – 10 samples in each category (this will be the human-copy control sample, which we know is 100% human)<\/li>
  3. Tested GPTZero and ZeroGPT on both samples and compared the scores.<\/li><\/ol>\n\n\n\n

    <\/p>\n\n\n\n

    And here\u2019s what we found out\u2026<\/strong><\/h2>\n\n\n\n

    1. ZeroGPT is overall more accurate in assessing AI in blog posts than GPTZero\u2026<\/h3>\n\n\n\n