Superhuman acquires AI detection startup GPTZero

Superhuman Inc., the productivity platform formerly known as Grammarly, has acquired the AI detection startup GPTZero, the companies announced on Tuesday, June -. The deal aims to combine AI-assisted writing tools with technology designed to identify machine-generated content, creating what Superhuman calls an "authenticity layer" for digital content.

Financial terms of the acquisition were not disclosed. According to PitchBook data, GPTZero was valued at over $88 million. The startup, co-founded in 2023 by Edward Tian and Alex Cui, reported having more than 19 million registered users and approximately $30 million in annual recurring revenue. GPTZero's entire team of about 30 employees, including both co-founders, will join Superhuman to lead its authenticity efforts.

The acquisition highlights a strategic pivot for Superhuman, which rebranded from Grammarly last October as it expanded beyond grammar correction into a broader productivity suite. While Grammarly's core tools help users write and refine text, often with AI assistance, GPTZero built its reputation on detecting AI-generated writing. Superhuman CEO Shishir Mehrotra said in a statement that the combination brings...