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Is GPTZero Accurate?

GPTZero is one of the most widely used AI detection tools around. It aims to help users differentiate between human and AI-made text in a matter of seconds, providing detailed insights and reports on every text scanned.

However, there are lots of examples of people criticizing this platform. This Reddit thread, for example, contains many users complaining about false positives with GPTZero, which the platform kept flagging human-written content as AI.

So, is GPTZero really accurate? And is GPTZero reliable at spotting AI content every time? Let's find out through our carefully prepared tests.

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How Does GPTZero Work?

Before we look in-depth at whether is GPTZero accurate, we'll first focus on another question: how does GPTZero work? By understanding the methodology of this tool, you should find it easier to discern its accuracy and effectiveness.


Designed by Princeton student Edward Tian, GPTZero is an AI detection program that launched in January of 2023. It makes use of its own algorithm to scan provided text, focusing on aspects like "Perplexity" and "Burstiness" to see if the passage was written by a bot or a person. This is backed up by a range of specially developed language models to separate human and AI content.

The General Views of GPTZero

So, what do the people think about GPTZero? We took a look at a range of critical reviews, online discussions, Reddit threads, tweets, forums, and more to find out.

General User Experience

In general, people are having positive experiences with GPTZero, as it’s a very straightforward tool to use. All you have to do is copy and paste your chosen passage of text to scan into the tool’s text box. From there, you can click the Check Origin button and begin a scan. GPTZero also supports scans of uploaded files.

GPTZero can give you a detailed analysis of the sample text, letting you know exactly how much AI has been detected, if any. Users can also use this tool for free scans of up to 5,000 characters, or you can pay for a premium plan to scan longer passages and unlock extra features, like writing feedback and plagiarism scans. Prices start at $10 per month.

Public Opinion on GPTZero

While GPTZero is a widely used and popular platform, it hasn’t always received the best user reviews. There are several Reddit threads, like "How does GPTZero work?" and "AI writing detectors such as GPTZero are not credible...", which are also filled with negative views of the tool. Many people complain about inaccurate results, false positives, and confusing scans.


Not only general users on social media are reporting “inaccurate” results from GPTZero, but researchers have also found that GPTZero, along with other tools, is unreliable. What’s more, the Washington Post wrote an extensive summary of GPTZero’s issue with false positives.

At the same time, this tool has been trusted by leading educational authorities, with many teachers and schools employing it to check student work for signs of AI usage. This comes in spite of so many users loudly proclaiming that GPTZero is wrong and makes a lot of mistakes.

Testing GPTZero’s Accuracy

To truly figure out how accurate is GPTZero, we have to put it to the test. So, let's do that. Below, we'll show you the results of our GPTZero accuracy experiment. This involved using AI tools, human writers, and AI paraphrasers to create a range of texts and see how GPTZero responded to each one.

AI-Generated Content

To start off, we’ll be using simple AI-generated content made by three of the top tools on the market: ChatGPT, Gemini, and Claude.

First up, we asked ChatGPT to write 100 words on the subject of “the importance of a healthy diet”.


A healthy diet is the cornerstone of overall well-being. It provides the essential nutrients needed for optimal physical and mental functioning. A balanced intake of proteins, carbohydrates, fats, vitamins, and minerals supports the body's various systems, promoting growth, immunity, and energy levels. A nutritious diet also aids in maintaining a healthy weight and reducing the risk of chronic diseases such as heart conditions and diabetes. Beyond physical health, dietary choices impact cognitive function and mood, influencing mental clarity and emotional stability. Embracing a diverse and nutrient-rich diet is an investment in long-term health, fostering vitality and enhancing the quality of life.

Here’s the scan report from GPTZero.


As you can see, GPTZero was pretty confident that this text was AI-written.

Next, we asked Gemini to write 100 words about how to get more exercise. Here’s the result:


Getting more exercise doesn't have to be a chore. Start small! Take the stairs instead of the elevator, park further away from your destination, or walk during your phone calls. Sneak movement into your day by doing jumping jacks during commercials or stretching while the kettle boils. Find activities you enjoy, like dancing, hiking, or swimming. Even just 10 minutes a day can make a difference! Remember, consistency is key. Gradually increase the duration and intensity of your workouts as you get stronger. Most importantly, have fun and celebrate your progress!

Here’s the results of GPTZero’s scan.


It was mostly correct here, but it only detected around 81% of the text as AI and wasn’t sure about the rest. This already calls GPTZero’s accuracy into question.

Finally, we used Claude to generate approximately 100 words on being a good role model. Here’s the text:


To be a good role model, you must lead by positive example. Demonstrate good character and integrity in everything you do. Be kind, caring, and respectful towards others. Maintain a sunny disposition and bring out the best in people through encouragement. Work hard towards your goals but remember to help those around you. Share your experiences and lessons learned to mentor and guide those looking up to you. Take responsibility for your actions and admit mistakes gracefully. Respect authorities and fulfill your duties conscientiously. Always strive to better yourself while inspiring others to follow righteous values and make wise choices.

GPTZero scanned it, and here’s the result:


Here, GPTZero did well, successfully determining that the text was almost definitely AI-written.

Paraphrased Content

Next, we wanted to see how GPTZero handled text that had been rewritten or paraphrased slightly with the aid of Quillbot.

We took all three of the pieces of AI-generated text and altered them with Quillbot. Here’s what it produced for the first sample.


Here’s the result of a quick GPTZero scan:


This result is very worrying for GPTZero accuracy levels. The tool was instantly fooled by this text, thinking that it was almost entirely human-written.

Next, Quillbot paraphrased the Gemini text:


Here’s what GPTZero thought of that piece:


Here, it got the right result, spotting that the content was AI.

Finally, we repeated the process with the text from Claude.


And here’s the third and final scan.


Again, GPTZero gets it wrong. It thinks that this is a mix of human and AI writing, even though it was made entirely with AI, with some simple word and expression changes.

Human Content

For the third part of our GPTZero accuracy experiment, we wrote three pieces of text ourselves, without any AI. We covered the same subjects, starting off with the importance of a healthy diet.

If you want to live a long and happy life, a healthy diet is key. “You are what you eat,” as the old saying goes, and there’s a lot of truth to that. The food that we put into our bodies has a direct impact on how we feel, both physically and mentally. If you opt for unhealthy, processed foods, you may feel sluggish, drained, and tired, as well as being at higher risk of illness and health problems. However, if you pick healthy foods – like lean meats and fresh fruits and veggies – you may find that you feel fitter, more energetic, alert, and aware. You’ll also have a better chance of staying healthy for longer, with reduced risk of major health problems.

Here’s what GPTZero thought:


Again, GPTZero is wrong here. It says that the text is a mix of AI and human, despite being written entirely by a human. This shows how the tool clearly has a false positive and accuracy problem.

Next, we wrote about how to get more exercise.

It can be tricky to find time to exercise, especially if you have a busy and hectic lifestyle. However, there are several ways to become more active, without necessarily needing to hit the gym for hours at a time. Try to take the active option in your day to day life, such as taking the stairs instead of the elevator, or riding your bike to work instead of driving. Additionally, look for little moments during the day where you can stand up, walk around, and do some stretches and exercises. Even 5-10 minute bursts of exercise each day are beneficial, and the more you do, the healthier you can become.

And here’s GPTZero’s view:


Again, GPTZero is wrong. This is another false positive, with the text being labeled as 94% likely to be AI-generated.

To finish up, we wrote 100 words about being a good role model.

Being a good role model is all about setting the right example for people around you. It might be your children, your employees, your friends, or even just strangers you meet. Regardless, try to live your life in the best way possible. Think about decisions you make, actions you take, and the impression you give off to the world around you, and try to make it all as positive as possible. Of course, you won’t always make the right call or be able to keep negative emotions under control. So, try to find your own ways to be positive, motivated, and responsible. Seek mentorship from your own role models to inspire you, and always consider how your actions might impact the feelings and thoughts of others.

Finally, here’s the GPTZero scan result:


Yet another false positive. So, if you're wondering if is GPTZero reliable or accurate, these results show that it's far from accurate when scanning real human writing. It made big mistakes in all three short articles.

HIX Bypass: Bypass GPTZero Detection Every Time

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Our tests clearly show that GPTZero’s accuracy levels are certainly unreliable. This can make the tool really hard to work with because even if you write everything yourself or make manual edits, it might still randomly detect your work as being made by AI.

Fortunately, HIX Bypass can help. HIX Bypass is an undetectable AI writer, powered by advanced humanization technology. It can take AI-generated passages of text and transform them to get past AI detectors like GPTZero, as well as Originality.ai and others. It features built-in AI detection, multiple bypass modes, and more.

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Testing HIX Bypass’s Performance

Not convinced? Well, to prove that HIX Bypass can actually do what it claims, we decided to test it too. We put it through the same experiment as the previous tools, taking all three of our original AI-generated texts, running them through HIX Bypass, and then scanning the results with GPTZero. The results were very impressive, as you’ll see.

HIX Bypass Processing ChatGPT Content

Here’s the result of the first piece of text, originally written by ChatGPT, then humanized with HIX Bypass.


And this is the result from GPTZero.


HIX Bypass Processing Gemini Content

This is the result of HIX Bypass humanizing the Gemini-generated text.


Followed by the result from GPTZero.


HIX Bypass Processing Claude Content

We are now using HIX Bypass to humanize the content generated by Claude. Here is the result.


And this is the scan result from GPTZero.


As you can see, all three HIX Bypass texts were a success. They got past GPTZero’s confusing and overly sensitive scans with ease, with almost perfect scores for all three.

Test Results Roundup

The table below breaks down the results of all of our tests.

  • Source of Text
  • GPTZero Result
  • Success or Failure?
  • AI – ChatGPT
  • 96% AI
  • Success
  • AI – Gemini
  • 81% AI
  • Mostly Success
  • AI – Claude
  • 95% AI
  • Success
  • Quillbot – ChatGPT
  • 7% AI
  • Failure
  • Quillbot – Gemini
  • 92% AI
  • Success
  • Quillbot – Claude
  • 6% AI
  • Failure
  • Human #1
  • 4% Human
  • Failure
  • Human #2
  • 1% Human
  • Failure
  • Human #3
  • 15% Human
  • Failure
  • HIX Bypass #1
  • 0% AI
  • Failure
  • HIX Bypass #2
  • 0% AI
  • Failure
  • HIX Bypass #3
  • 0% AI
  • Failure

As you can see here, the majority of the tests resulted in total failure for GPTZero. It almost never got the right result from scanning a piece of text and demonstrated extreme levels of unreliability.


We began this review with a simple question. Is GPTZero accurate? Well, the results of the testing are clear to see. GPTZero is far from accurate and users may find it challenging as a reliable reference. It's a confusing and unreliable tool that confuses human content with AI, and vice versa, on a regular basis, leading to lots of false positives and bizarre results.

This also makes GPTZero really hard to get past, because it’s so random in its results. Fortunately, HIX Bypass has proven itself more than capable of bypassing GPTZero every time, with all three of our HIX Bypass tests getting near-perfect human scores. So, if you want to bypass GPTZero consistently and avoid its random AI detection, choose HIX Bypass.

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