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GPTZero for Chrome was built with education in mind, to encourage students to build better writing skills and support teachers with tools for their classroom, with the support of the American Federation of Teachers (AFT).
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.
GPTZero is the first and leading AI detector that allows you to identify specific content in a document or text that has been generated by a large language model (LLM), such as ChatGPT. Founded in January 2023, GPTZero has served over 10 million users to date and works with 100+ organizations in education, hiring, publishing, legal and more.
AI detectors work by looking for patterns in text that are more likely to have been written by a machine than a human. The most common factors they look for include:
GPTZero uses its own proprietary model that takes hundreds of factors into consideration and boasts the highest detection accuracy in the industry.
Yes. Independent benchmarks, like our partners at Penn State’s AI Research Lab, and our own large-scale testing show that GPTZero is the most accurate AI detector, with a 99% accuracy rate when spotting AI-generated text vs. human writing, a false negative rate under 2%, and a false positive rate under 1%. This means we correctly classify AI writing 99 out of 100 times, and keep misclassification of text to an absolute minimum.
Unlike many competitors, GPTZero can reliably detect “mixed documents” (where human and AI writing are combined) with 96.5% accuracy rate. While no AI detector can ever truly be 100% perfect, we are committed to being a leader in responsible adoption of AI generation and AI detection technologies.
You can start using GPTZero straight away in 3 easy steps:
GPTZero is the most trusted AI content checker in education, both for teachers and students who use GPTZero to guide conversations on academic integrity and writing improvement. GPTZero is used in over 3500 colleges and 100s of institutions. We also serve publishers, recruiters, copy-writers, marketers and businesses where authentic and quality writing truly matters.
No. GPTZero works across a wide range of AI language models, including but not limited to ChatGPT, GPT-5, GPT-4, GPT-3, Gemini, Claude, Llama, Deepseek, and AI services based on those models. Our detector is designed for the highest accuracy rate regardless of which model may have produced the text.
In our latest model release, we’ve updated the majority of our training data, including more AI documents from: OpenAI – GPT4.1,GPT4.1-mini, o3, o3-mini Gemini – 2.5 Pro, 2.5 Flash, 2.5 Flash-Lite Claude, Sonnet 4 as well as a few other models.
GPTZero fully supports English, German, Portuguese, French and Spanish with industry-leading accuracy. We are also constantly used in many other languages and in over 100 countries.
GPTZero is consistently rated the most accurate and reliable AI detector across various use cases.
No AI detector is 100% accurate, and AI itself is changing constantly. Results should not be used to punish or as the final verdict. Accuracy improves with longer inputs (document-level results are stronger than paragraph or sentence-level) and is strongest on English prose.
GPTZero is the only AI detector de-biased for ESL (English Second Language) learners, which many competitors do not take into account. We repeatedly train our model to reduce false positive rate for ESL writing to 1%. We also monitor our datasets to transparently prevent any bias in AI detection training data.
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:
Our model is trained on millions of documents spanning various domains of writing including creating writing, scientific writing, blogs, news articles, and more. 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.
To see the full schema and try examples yourself, check out our API documentation.
Our API returns a document_classification
field which indicates the most likely classification of the document. The possible values are HUMAN_ONLY
, MIXED
, and AI_ONLY
. We also provide a probability for each classification, which is returned in the class_probabilities
field. The keys for this field are human
, ai
or mixed
. To get the probability for the most likely classification, the predicted_class
field can be used. The class probability corresponding to the predicted class can be interpreted as the chance that the detector is correct in its classification. I.e. 90% means that 90% of the time on similar documents our detector is correct in the prediction it makes. Lastly, each prediction comes with a confidence_category
field, which can be high
, medium
, or low
. Confidence categories are tuned such that when the confidence_category
field is high
99.1% of human articles are classified as human, and 98.4% of AI articles are classified as AI.
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 solely 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.
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.