Superhuman acquires GPTZero to merge AI writing tools with detection capabilities

Superhuman acquires AI detection startup GPTZero

GPTZero, the three-year-old AI detection startup that Princeton grad Edward Tian first built as a senior thesis project, has been acquired by Superhuman, the companies announced on Tuesday. Terms of the deal were not disclosed, though Tian told Business Insider that GPTZero amassed more than 19 million registered users and $30 million in annual recurring revenue. In 2024, Tian told TechCrunch that it was profitable. 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. Superhuman -- the company formed when Grammarly bought 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 AI slop. Grammarly's tool has been 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."

Superhuman has acquired AI authenticity service GPTZero - Engadget

It's an odd-seeming move for a company selling an AI writing assistant. Superhuman announced that it has acquired GPTZero. This AI identification business offers services such as hallucination and plagiarism detection as well as a nifty little tool that displays how much of the internet is artificial intelligence. Superhuman said it plans to integrate GPTZero into its Superhuman Go AI assistant to improve the reach of its existing efforts around AI and authenticity. Teachers and students will still be the priority audience for Superhuman following the acquisition. For its part, GPTZero emphasized that Superhuman would also help put its tools in places where people were already reading and writing. Financial terms of the deal weren't disclosed. On the surface, this seems like an odd pairing. The press release announcing the acquisition focuses on concerns about the public being able to identify AI-generated content, but Superhuman is quite literally encouraging people to use AI to generate content. The company's most popular product is the AI writing assistant Grammarly, which does have its own tools for AI detection. However the push to put AI resources everywhere in Grammarly has also landed Superhuman in some hot water. Notably, the company tried to give its users AI generated feedback that aped the voice and style of other writers; said other writers were none too pleased.

Grammarly parent Superhuman buys AI detector GPTZero

Superhuman Inc., the company formerly known as Grammarly, said today it has agreed to acquire GPTZero Inc., the startup whose detection tools tell teachers, editors and hiring managers when a piece of writing came from a machine. The acquisition price was not disclosed. The acquisition is arguably ironic. Grammarly spent years building tools that help people write with artificial intelligence. Now, under its new Superhuman name, it is buying the company best known for catching that same AI output. The rebrand in October came as Grammarly pushed past grammar correction into a wider productivity platform. Superhuman calls the purchase part of an authenticity layer, its term for tools that show where content came from and whether to trust it. GPTZero will be built into Superhuman Go, the company's AI assistant, which Superhuman says works across 1 million apps and websites. GPTZero was launched in 2022 and was one of the first AI writing detectors to take off after the arrival of ChatGPT the same year. The company says it now has 19 million registered users and around $30 million in annual recurring revenue. Founders Edward Tian, Alex Cui and about 30 staff are moving to Superhuman. Detection is no longer the whole product. GPTZero also flags fake citations and made-up statistics, checks for plagiarism, verifies that cited sources exist and scans social feeds for AI content through a tool called AI Vision that launched in February. A separate feature, Replay, logs the keystroke history of a document to show how it was actually written. Superhuman is not arriving empty-handed. Its own detector, kept from the Grammarly days, ranks first for quality on RAID, an independent benchmark that runs detectors against more than 670,000 samples. Two detectors trained on different data, the company argues, catch more than one. "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," Shishir Mehrotra, chief executive of Superhuman, said in a statement. The timing tracks a real shift. A Graphite study cited by Superhuman found AI now writes about half of all newly published online articles. Detectors started in the classroom and have since moved into hiring, publishing and compliance work. They are also still wrong often enough to produce false positives. Coming into its acquisition, GPTZero had raised approximately $13.5 million in venture funding, including a $10 million Series A in June 2024. PitchBook last valued the company above $88 million. Superhuman started in 2009 in San Francisco and now claims 40 million daily users.

Superhuman acquires GPTZero to expand AI authenticity tools

Superhuman has acquired GPTZero, an AI authenticity service specializing in detecting AI-generated content. GPTZero provides services including hallucination and plagiarism detection, alongside a tool that shows the proportion of internet content generated by AI. Superhuman plans to integrate GPTZero into its Superhuman Go AI assistant to enhance its AI and authenticity initiatives. The focus on teachers and students remains a priority for Superhuman following the acquisition. GPTZero stated that Superhuman would assist in placing its tools where users are already engaged in reading and writing, which aligns with their mission of promoting authenticity in content creation. Financial terms of the acquisition were not disclosed. Observers noted a contradiction in the acquisition, as Superhuman promotes AI for content generation, whereas GPTZero primarily identifies AI-generated content. Superhuman's most notable product, the AI writing assistant Grammarly, already includes its own AI detection tools. Superhuman has faced criticism for aiming to provide AI-generated feedback that mimicked the voices and styles of other writers, causing discontent within the writing community.

Superhuman Acquires GPTZero to Strengthen Trust and Transparency in AI Workflows

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. 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.