Superhuman has acquired GPTZero, a startup known for AI-generated content detection. The deal brings together productivity software and AI verification capabilities as businesses increasingly seek tools that improve trust, transparency, and efficiency in AI-assisted workflows. GPTZero is valued at over $88 million, according to PitchBook. Terms of the recent Superhuman deal were not disclosed.
GPTZero is a three-year-old AI detection startup that Princeton graduate Edward Tian first built as a senior thesis project. Superhuman was formed when Grammarly bought email provider Superhuman last year and rebranded under that name. It already had an AI detection tool built into its platform. GPTZero’s mission has been to help humans detect and defend against AI slop. Grammarly’s tool has been designed to help users, often students, determine whether their writing appears AI-generated, then revise it so it doesn’t. As for why Superhuman bought a competitor, Superhuman says that “two AI detectors are better than one.”
In 2024, Tian and co-founder CTO Alex Cui, who’d been 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. All told, the company raised just $13.5 million.
With the rise of artificial intelligence, there has been a need for individuals to use authenticity software such as AI detectors. The AI detector that Superhuman makes as part of its product line through Grammarly is its fastest-growing product. It ranks among the best for the quality of detection through a very strict test called RAID (Robust AI Detection), which determines how well an AI detector distinguishes human-generated text from AI-generated text. The tool was made famous in the educational sector both for students and instructors, but is now needed in fields such as recruiting, content publishing, and compliance.
“We started GPTZero because we believed trust in content is vitally important, and that belief has only grown stronger as AI becomes ubiquitous,” said Edward Tian, Co-Founder of GPTZero. “Joining Superhuman means our tools can be there at the exact moment someone needs them, not as a separate step, but as a natural part of how people already write and read. We’re excited to continue to build toward that together,” he added.
The launch of GPTZero's AI Vision in February 2026 brings AI detection to the topmost platforms on the internet. AI Vision detects what is artificially generated in real-time on a user's feed and does so on the biggest internet platforms for social media, emails, publishing, and reviews.
"As part of the Superhuman AI productivity platform, we're building an authenticity layer, and GPTZero accelerates our vision. Together, we're bringing the most trusted writing tool and the most trusted AI detector into one platform, so that confidence in content becomes the default for writers and consumers," said Shishir Mehrotra, CEO of Superhuman. "GPTZero has built something truly remarkable; a product people turn to when it matters most. Our goal is to put that same level of content transparency in the hands of more people wherever they already work," he added.
The acquisition allows Superhuman to expand beyond productivity tools and strengthen its AI capabilities. As GPTZero's technology becomes part of the platform, users could benefit from improved transparency, content verification, and more reliable AI-assisted workplace experiences.