We tested our first engine on 935 texts. It caught the AI, but it caught most of the people as well.

We scored these texts from a 2023 research dataset in June 2026, using an engine that we have since retired.
Texts flagged as AI, at the threshold that scored best
AI texts92%
Human texts69%
935
texts tested
5
subject areas
11%
of AI caught when only 5% of people are flagged
To be clear, this chart used to show GPTZero, Turnitin and Originality.ai beside us, with figures we credited to a study from 2023. When we checked, we couldn't trace them to that study, so they have come off and a correction now sits on the full results page. A result like the one above is the reason we built Analysis, and it is also why UnTXT gives you no percentage now.
Full results and the correction → untxt.uk