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GPTZero, the three-year-old AI sensing startup first created by Princeton graduate Edward Tian as a senior thesis project, has been acquired by Superhuman, the companies announcement Tuesday.
Terms of the deal were not disclosed, although Tian told Business Insider that GPTZero has amassed over 19 million registered users and $30 million in annual recurring revenue.
In 2024, Tian told TechCrunch it’s profitable. Tian and co-founder CTO Alex Cui, friends since high school, raised a $3.5 million seed round led by Uncork Capital, followed by a $10 million, Series A in June 2024, led by Footwork co-founder Nikhil Basu Trivedi, with several other notable investors including Reach Capital, Jack Altman’s Alt Capital and Neo. In total, the company only raised $13.5 million.
Superhuman – the company formed when Grammarly purchased email provider Superhuman last year and rebranded under that name – already had an AI detection tool built into its platform. GPTZero’s mission has been to help humans detect and defend against damage caused by AI. Grammarly’s tool was designed to help users, often students, determine whether their writing appears AI-generated, and then revise it so that it isn’t. As for why Superhuman bought a competitor, Superhuman said that “two AI detectors are better than one”.
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