Fact · Voice and AI
9percent
On OpenAI's challenge set, its AI text classifier incorrectly labeled 9 percent of human-written text as AI-written.
Checked against its source on October 17, 2026
In the source's own words
“while incorrectly labeling human-written text as AI-written 9% of the time”
New AI classifier for indicating AI-written text (OpenAI, January 31, 2023, with July 2023 update), Jan Hendrik Kirchner et al., OpenAI, 2023, Limitations section of the post.
Open the original- What it measures
- This is the false-positive rate from the same challenge set as the 26 percent true-positive figure, so both numbers describe one test.
- What it does not show
- A false-positive rate of 9 percent is a figure from one test of an early classifier. It does not predict how often any current detector flags a real human essay, and it says nothing about dictated text.