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On January 31 2023, OpenAI launched an AI text classifier tool aimed at detecting whether passages were written by a human or AI system. This launch was set to change the landscape in detecting synthetic content and help institutions flag this type of content. However, just months after its release, OpenAI abruptly discontinued the tool due to its disappointingly low rate of accuracy in differentiating human and AI writing.

OpenAI’s Classifier and Its Shortcomings

OpenAI’s text classifier tool aimed to detect AI-generated content by analyzing linguistic features in text passages. It would assign a “probability rating” to indicate if the system determined the text was written by a human or AI. After launching, the tool gained some popularity as interest grew around AI detection.

However, just a few months later on July 20, 2023, OpenAI announced it was discontinuing the classifier due to its low accuracy rate. In practice, the system struggled significantly to reliably differentiate between human and machine writing. Despite analyzing linguistic patterns, the classifier often failed to correctly identify whether passages were AI-generated or not. Our thorough research on the Best AI detectors revealed a surprisingly weak detection rate for the tool deployed by Open AI. 

The Broader Challenge of Advancing AI Detectors

The abrupt failure of OpenAI’s classifier underscores the ongoing challenges faced in developing accurate AI detection systems. Recent research has revealed significant weaknesses and biases among current AI checkers. 

Studies found these tools frequently mislabel human-written text as AI-generated.

Furthermore, many AI detection softwares are not trained on new LLM’s and unable to detect them. They can also get easily bypassed by paraphrasing tools such as Quillbot.

The rapid advancement of generative AI also means detection tools are often outpaced, allowing easier evasion. Winston AI’s primary objective is to continually improve its model to detect AI writing, while minimizing occurrences of false positives. 

The Need for Better Solutions

While AI detection technology remains critically important for accountability as artificial content spreads, examples like OpenAI show the task is not easy. Winston AI’s core mission is to detect AI, while many other alternative AI detectors are provided as a side project. OpenAI stated its commitment to developing more robust provenance techniques, but its classifier’s rapid failure reveals perfecting such systems remains difficult.

Some say the pace of generative AI development currently outpaces innovation in detection methods, but Winston AI has by far the most accurate AI detection model available. 


The abrupt discontinuation of OpenAI’s AI text classifier after just a few months demonstrates the formidable challenges that remain in developing reliable AI detection tools. Their classifier quickly failed despite aiming to differentiate human versus machine writing by analyzing linguistic patterns.

Large companies leading the AI movement, including Amazon, Anthropic, Google, Inflection, Meta, Microsoft, and Open AI met with the Biden-Harris administration and made voluntary commitments to advance safe, secure and transparent AI development. This includes the addition of watermarks to ensure the ability to detect AI, especially deep fakes. 

As artificial content spreads, developing more robust AI detection technology only grows more crucial for upholding transparency and trust. While far from perfect, improving such tools through ongoing research and progress remains essential.


What was OpenAI’s text classifier tool and what was its purpose?

OpenAI’s text classifier was an AI system launched on January 31 2023 aimed at detecting whether text passages were written by a human or an AI system. It was designed to analyze linguistic features in writing and assign a “probability rating” to indicate if the content was AI-generated. The goal was to help address the growing need for identifying artificial content as generative AI systems become more advanced. 

Why did OpenAI end up shutting down its text classifier after just a few months?

OpenAI discontinued its text classifier in July 2023, just months after its release, due to its disappointingly low accuracy rate in differentiating human and AI writing. In practice, the system struggled to reliably tell human-written and machine-written content apart through its linguistic analysis.

Why does improving AI detection technology remain important despite the challenges?

While developing accurate AI detection is difficult, it remains critically important for accountability as artificial content spreads. Tools like OpenAI’s, despite flaws, aim to uphold transparency about the provenance of text and other media. As generative AI advances, better solutions are essential even if progress is slow.

What steps are being taken to try to improve AI detection capabilities?

Major AI companies have made commitments to advance safe and transparent AI development, including improving capabilities to detect AI content. Ongoing research also continues working to strengthen detection tools and minimize false identifications of human-created content. However, perfecting such systems remains challenging as AI capabilities rapidly expand.

Thierry Lavergne

Co-Founder and Chief Technology Officer of Winston AI. With a career spanning over 15 years in software development, I specialize in Artificial Intelligence and deep learning. At Winston AI, I lead the technological vision, focusing on developing innovative AI detection solutions. My prior experience includes building software solutions for businesses of all sizes, and I am passionate about pushing the boundaries of AI technology. I love to write about everything related to AI and technology.