[AI Revolution](60) "A+ Report, Written by AI"… 'Killer' to Catch ChatGPT Emerges

Muhayu, 'GPT Killer' to Detect ChatGPT Launching This Month
AI Plagiarism Checker 'Copykiller' Holds No.1 Market Share in Korea

Last March, when universities faced their first semester opening after the ChatGPT boom, the customer service center of AI technology company Muhayu was overwhelmed with calls. Many calls were about suspected submissions of assignments written by ChatGPT, but there was no basis to take issue with them, causing headaches. Since nine out of ten four-year universities in Korea use Muhayu's AI plagiarism detection service, they sent out SOS calls. Shin Dong-ho, CEO of Muhayu, said, "According to a customer survey, 78.7% responded that AI detection services are necessary, indicating high demand." Muhayu developed 'GPT Killer,' a tool that detects texts written by ChatGPT, and is set to launch it this month.

Detecting ChatGPT and Fact-Checking

GPT Killer Example [Photo by Muhayu]

The principle behind detecting ChatGPT is as follows. ChatGPT writes by probabilistically analyzing the order of words in sentences. It selects words and knowledge with high probability based on human speech. In other words, ChatGPT frequently uses certain sentence orders and expressions. This differs from humans who have unique tones or writing styles like fingerprints. Muhayu focused on this point. They calculate the probability that a text was written by ChatGPT by checking if the writing follows an average, machine-like pattern. Muhayu’s self-assessed accuracy of GPT Killer is 94%.

They are also developing a service to evaluate the validity of content written by ChatGPT. ChatGPT sometimes produces false information, known as hallucination. This service fact-checks such content. It compares ChatGPT’s text with data from reliable institutions such as research institutes or government agencies. If ChatGPT cites sources, the service also evaluates whether those sources are accurate. The launch is planned for the first half of next year.

The quick response to ChatGPT’s side effects was backed by experience gained from 'Copykiller.' Copykiller is a plagiarism detection service launched by Muhayu in 2011. It compares the document under inspection with over 10 billion documents including theses, reports, and internet posts, calculating the probability of plagiarism. It has patented technology that can check a document of about 20 A4 pages within 1 to 2 minutes. Most universities, metropolitan and provincial education offices, and public institutions in Korea use it. It holds a 90% share of the domestic plagiarism detection market, making it the top player.

Understanding 'Intelligence' as Much as Technology... Expanding Market to China and Japan

Shin Dong-ho, CEO of Muhayu
Photo by Muhayu

After more than 10 years devoted to AI, Muhayu emphasizes the importance of people. CEO Shin’s philosophy is that AI technology should not differ from human methods. He stresses that understanding 'intelligence' is as important as the 'artificial' technology in AI. Shin himself was an engineering student at Seoul National University who studied computer engineering and cognitive science, deeply interested in linguistics and psychology.

The same approach was taken when developing 'Prism,' an AI-based self-introduction evaluation tool, and 'Monster,' an AI interview service. Employees from humanities backgrounds majoring in Korean literature, library and information science, psychology, and HR experts participated. They researched what makes a good self-introduction and what constitutes a fair evaluation, designing measurement methods that developers then technically implemented. Shin explained, "Instead of worrying about which latest technology to apply, we first considered and defined the criteria for evaluating people and what it means to perform well in an interview."

Muhayu plans to continue focusing on automating document review. They believe their competitive edge lies in language processing technology and education and recruitment specialized services. However, they plan to expand their market. In 2020, they entered the Japanese market with 'Copymonitor,' the Japanese version of Copykiller. Currently, about 25,000 users from over 60 universities in Japan use Copymonitor. This year’s second half, they will enter the Chinese market with 'Copykiller China.' To target East Asia with linguistic similarities, they are also considering expansion into Indonesia and Vietnam.