More than an AI detector
Preserve what's human.

We bring transparency to humans navigating a world filled with AI content. GPTZero is the gold standard in AI detection, trained to detect ChatGPT, GPT4, Bard, LLaMa, and other AI models.

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Use our AI detection tool as you browse the internet for AI content. Create a Writing Report on Google Docs to view statistics about your writing.

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writing report

With our writing report, you are able to see behind the scenes of a google doc, including writing statistics, AI content, and a video of your writing process.

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AI detection API

We built an easy to use API for organizations to detect AI content. Integrate GPTZero’s AI detection abilities into your own tools and workflow.

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Deep Analysis View

  • CheckmarkLeverages the latest breakthrough in AI detection research.
  • CheckmarkUnprescedented granular view and understanding of results.
  • CheckmarkColor-coded highlights for most AI and Human sections of writing.
  • CheckmarkStatistical analysis for exactly how each sentence affects AI probabilities.
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Our Technology

Leading research in AI content detection modeling

Our AI detection model contains 7 components that process text to determine if it was written by AI. We utilize a multi-step approach that aims to produce predictions that reach maximum accuracy, with the least false positives. Our model specializes in detecting content from Chat GPT, GPT 3, GPT 4, Bard, and LLaMa models.

How does it work?
With over 1 million users

Discover our Detection Dashboard

Our dashboard was developed specifically with educators’ content needs in mind.
Access a premium model trained to detect student writing and ed-tech use cases.

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Batch file scans

Upload multiple files at once for AI content detection.

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Plagiarism scanning

Scan your documents for plagiarism.

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API access

We built an easy to use API for organizations.

AI Text Detection and Analysis Trusted by Leading Organizations

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“The best AI checker"

according to our customers and community
Kyle Wiggins

GPTZero was the only consistent performer, classifying AI-generated text correctly. As for the rest … not so much.

CEO, Transit Pluto Studios
Samantha Warren

GPTZero has been incomparably more accurate than any of the other AI checkers. For me, it’s the best solution to build trust with my clients.

President, American Federation of Teachers
Randi Weingarten

This tool is a magnifying glass to help teachers get a closer look behind the scenes of a document, ultimately creating a better exchange of ideas that can help kids learn.

Director of Learning
Catalina Ramirez

The granular detail provided by GPTZero allows administrators to observe AI usage across the institution. This data is helping guide us on what type of education, parameters, and policies need to be in place to promote an innovative and healthy use of AI.

Assistant Professor of Economics, University of Toronto
Kristina McElheran

Sign up for GPTZero. Its feedback aligns well with my sense of what is going on in the writing - almost line-for-line.

General FAQs about our AI Detector

Everything you need to know about GPTZero and our chat gpt detector. Can’t find an answer? You can talk to our customer service team.

What is GPTZero?

GPTZero is the leading AI detector for checking whether a document was written by a large language model such as ChatGPT. GPTZero detects AI on sentence, paragraph, and document level. Our model was trained on a large, diverse corpus of human-written and AI-generated text, with a focus on English prose. To date, GPTZero has served over 2.5 million users around the world, and works with over 100 organizations in education, hiring, publishing, legal, and more.

How do I use GPTZero?

Simply paste in the text you want to check, or upload your file, and we'll return an overall detection for your document, as well as sentence-by-sentence highlighting of sentences where we've detected AI. Unlike other detectors, we help you interpret the results with a description of the result, instead of just returning a number.

To get the power of our AI detector for larger texts, or a batch of files, sign up for a free account on our Dashboard.

If you want to run the AI detector as your browse, you can download our Chrome Extension, Origin, which allows you to scan the entire page in one click.

When should I use GPTZero?

Our users have seen the use of AI-generated text proliferate into education, certification, hiring and recruitment, social writing platforms, disinformation, and beyond. We've created GPTZero as a tool to highlight the possible use of AI in writing text. In particular, we focus on classifying AI use in prose.

Overall, our classifier is intended to be used to flag situations in which a conversation can be started (for example, between educators and students) to drive further inquiry and spread awareness of the risks of using AI in written work.

Does GPTZero only detect ChatGPT outputs?

No, GPTZero works robustly across a range of AI language models, including but not limited to ChatGPT, GPT-4, GPT-3, GPT-2, LLaMA, and AI services based on those models.

Why GPTZero over other detection models?

  • GPTZero is the most accurate AI detector across use-cases, verified by multiple independent sources, including TechCrunch, which called us the best and most reliable AI detector after testing seven others.
  • GPTZero builds and constantly improves our own technology. In our competitor analysis, we found that not only does GPTZero perform better, some competitor services are actually just forwarding the outputs of free, open-source models without additional training.
  • In contrast to many other models, GPTZero is finetuned for student writing and academic prose. By doing so, we've seen large improvements in accuracies for this use-case.
Lastly, many of our users - especially educators - have told us they trust GPTZero because we have only one mission: provide every human with the tools to detect and safely adopt AI technologies. Unlike many providers who recently released detectors as a side product, this mission will always be our number one priority.

What are the limitations of the classifier?

The nature of AI-generated content is changing constantly. As such, these results should not be used to punish students. We recommend educators to use our behind-the-scene Writing Reports as part of a holistic assessment of student work. There always exist edge cases with both instances where AI is classified as human, and human is classified as AI. Instead, we recommend educators take approaches that give students the opportunity to demonstrate their understanding in a controlled environment and craft assignments that cannot be solved with AI.

The accuracy of our model increases as more text is submitted to the model. As such, the accuracy of the model on the document-level classification will be greater than the accuracy on the paragraph-level, which is greater than the accuracy on the sentence level.

The accuracy of our model also increases for text similar in nature to our dataset. While we train on a highly diverse set of human and AI-generated text, the majority of our dataset is in English prose, written by adults.

Our classifier is not trained to identify AI-generated text after it has been heavily modified after generation (although we estimate this is a minority of the uses for AI-generation at the moment).

Currently, our classifier can sometimes flag other machine-generated or highly procedural text as AI-generated, and as such, should be used on more descriptive portions of text.

What can I do as an educator to reduce the risk of AI misuse?

We believe that the best outcome for educators and students arrives by working together proactively to understand the problem of AI misuse and find strategies that hone in on the human value of education. For example, educators can:
  1. Help students understand the risks of using AI in their work (to learn more, see this article), and value of learning to express themselves. For example, in real-life, real-time collaboration, pitching, and debate, how does your class improve their ability to communicate when AI is not available?
  2. Create an assessment that cannot be answered by Chat GPT or other AI. For example:
    • Ask students to write about personal experiences and how they relate to the text, or reflect on their learning experience in your class.
    • Ask students to critique the default answer given by Chat GPT to your question.
    • Require that students cite real, primary sources of information to back up their specific claims, or ask them to write about recent events.
    • Assess students based on a live discussion with their peers, and use peer assessment tools (such as the one provided by our partner, Peerceptiv).
    • Ask students to complete their assignments in class or in an interactive way, and shift lectures to be take-home.
  3. Ask students to produce multiple drafts of their work that they can revise as peers or through the educator, to help students understand that assignments are meant to teach a learning process.
  4. Ask students to produce work in a medium that is difficult to generate, such as powerpoint presentations, visual displays, videos, or audio recordings.
  5. Set expectations for your students that you will be checking the work through an AI detector like GPTZero, to deter misuse of AI.

I'm an educator who has found AI-generated text by my students. What do I do?

Firstly, at GPTZero, we don't believe that any AI detector is perfect. There always exist edge cases with both instances where AI is classified as human, and human is classified as AI. Nonetheless, we recommend that educators can do the following when they get a positive detection:

  1. Ask students to demonstrate their understanding in a controlled environment, whether that is through an in-person assessment, or through an editor that can track their edit history (for instance, using our Writing Reports through Google Docs). Check out our list of several recommendations on types of assignments that are difficult to solve with AI.
  2. Ask the student if they can produce artifacts of their writing process, whether it is drafts, revision histories, or brainstorming notes. For example, if the editor they used to write the text has an edit history (such as Google Docs), and it was typed out with several edits over a reasonable period of time, it is likely the student work is authentic. You can use GPTZero's Writing Reports to replay the student's writing process, and view signals that indicate the authenticity of the work.
  3. See if there is a history of AI-generated text in the student's work. We recommend looking for a long-term pattern of AI use, as opposed to a single instance, in order to determine whether the student is using AI.

What data did you train your model on?

We test our models on a never-before-seen set of human and AI articles from a section of our large-scale dataset, in addition to a smaller set of challenging articles that are outside its training distribution. We classify 99% of the human-written articles correctly, and 85% of the AI-generated articles correctly, when we set a threshold of 0.88 on the completely_generated_prob returned by our API (human if below 0.88, AI if above 0.88). Our classifier achieves an AUC score (definition) of 0.98.

How do I use and interpret the results from your API?

To see the full schema and try examples yourself, check out our API documentation.

Our classifier returns a document-level scorecompletely_generated_prob that specifies the probability the entire document was AI-generated. We would recommend using this score when deciding whether or not there is a significant use of AI in generating the text.n our validation dataset, here is how the results change when you set all documents with completely_generated_prob under the threshold as human, and above as AI:

  • At a threshold of 0.88, 85% of AI documents are classified as AI, and 99% of human documents are classified as human
  • At a threshold of 0.5, 96% of AI documents are classified as AI, and 96% of human documents are classified as human

We recommend using a threshold of 0.88 or higher to minimize the number of false positives, as we think it is currently more harmful to falsely detect human writing as AI than vice versa.

Additionally, we highlight sentences that been detected to be written by AI. API users can access this highlighting through the highlight_sentence_for_ai field. The sentence-level classification should not be soley used to indicate that an essay contains AI (such as ChatGPT plagiarism). Rather, when a document gets a MIXED or AI_ONLY classification, the highlighted sentence will indicate where in the document we believe this occurred.

Are you storing data from API calls?

No. We do not store or collect the documents passed into any calls to our API. We wanted to be overly cautious on the side of storing data from any organizations using our API.

However, we do store inputs from calls made from our dashboard. This data is only used in aggregate by GPTZero to further improve the service for our users. You can refer to our privacy policy for more details.

How do I cite GPTZero for an academic paper?

You can use the following bibtex citation:

    publisher = {GPTZero},
    url       = {},
    year      = {2023},
    author    = {Tian, Edward and Cui, Alexander},
    title     = {GPTZero: Towards detection of AI-generated text using zero-shot and supervised methods}