Rated #1 Best AI Detector by Forbes!


AI-generated text has transformed every aspect of our lives, including the classroom. However, detecting likely AI-generated content in students’ submissions is just one piece in the broader, complex, ever-evolving AI writing puzzle.


As AI blurs the lines between human and machine-generated content, maintaining integrity in academic writing is essential. Turnitin’s AI writing detection tool is built around a unique transformer deep-learning architecture that enables institutions to identify when AI tools may have been used in submissions. Discover the technology behind our solution in our detailed whitepaper.

Check out the links below if you’re interested in the additional research we performed against English Language Learners and what an independent research study has revealed about Turnitin's AI-writing detection capabilities.

“Making AI-generated content more human-like”

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 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 .

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.

Winston AI sets the standard in AI content detection with its unmatched accuracy in identifying ChatGPT, GPT-4o, Google Gemini and all known AI models.

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.


Was this text written by a human or AI?

GPTZero is the 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.

Pros: Acting as a backup free AI content detector.

For those looking to try a free AI detector, Scribbr is a popular option designed specifically for academic content. The interface is friendly, and it provides users with a percentage score.Â

AI & Plagiarism Detector for Serious Content Publishers

Welcome to the Turnitin AI Innovation Lab, a hub for new and upcoming product developments in the area of AI writing. You can follow our progress on detection initiatives for AI-written content, ChatGPT, and AI paraphrasing.

AI content detectors can also help uncover academic dishonesty.

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:

Write, study, and research faster while remaining undetectable

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.

Here are the six popular AI content detectors that we tested:

Our API returns a field which indicates the most likely classification of the document. The possible values are , , and . We also provide a probability for each classification, which is returned in the field. The keys for this field are , or . To get the probability for the most likely classification, the 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 field, which can be , , or . Confidence categories are tuned such that when the field is 99.1% of human articles are classified as human, and 98.4% of AI articles are classified as AI.