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New AI classifier for indicating AI-written text (OpenAI, January 31, 2023, with July 2023 update)
Jan Hendrik Kirchner et al., OpenAI, 2023
Read the originalRead on October 17, 2026
- What it is
- OpenAI's announcement of its AI text classifier, with its accuracy figures on a challenge set and a July 2023 note that the tool was withdrawn for low accuracy. The copy is an archived snapshot of the original post, and the post's own text carries the update.
- How much weight it carries
- Written by the company that built the classifier, so it is a primary source for the tool's own results. The accuracy figures come from OpenAI's internal challenge set, not from independent testing. The live page no longer renders its text without JavaScript, so the archived copy is the one checked.
Facts taken from this source
- On OpenAI's challenge set of English texts, its AI text classifier correctly identified 26 percent of AI-written text as likely AI-written.
“our classifier correctly identifies 26% of AI-written text (true positives) as” (Limitations section of the post)
- On OpenAI's challenge set, its AI text classifier incorrectly labeled 9 percent of human-written text as AI-written.
“while incorrectly labeling human-written text as AI-written 9% of the time” (Limitations section of the post)
- OpenAI withdrew its AI text classifier on July 20, 2023, because of its low rate of accuracy.
“As of July 20, 2023, the AI classifier is no longer available due to its low rate of accuracy.” (Update note at the top of the post)
- OpenAI said its AI text classifier was very unreliable on short texts, below 1,000 characters.
“The classifier is very unreliable on short texts (below 1,000 characters).” (Limitations section of the post)