Humans are still writing the vast majority of guest columns published in the opinion pages of The Wall Street Journal, The Washington Post, and The New York Times, a Semafor analysis found — but large language models were creeping in well before a high-profile Journal op-ed provoked controversy this week.

Over the past month, 10 out of 310 guest submissions to the three publications were labeled as at least 80% “AI” by AI detector Pangram, suggesting AI is not yet making a meaningful dent in human contributions to the most prestigious publications.

Another 40 articles were partially AI-generated. Pangram uses custom AI models to analyze text and other content for AI and, according to a spokesperson, has a .01% false positive rate. If Pangram finds more than 80% of the text is AI generated, it is labeled as AI. In informal testing by Semafor, Pangram was very accurate in detecting AI-written text, though some complain of false positives.