OECD Links Heavy AI-Assisted Writing to a 28-Point Science-Score Gap

Students who use AI chatbots heavily to draft school writing scored about 28 points lower in science than near-nonusers in a socioeconomic-adjusted comparison in the OECD's PISA 2025 data. The report cautions that the association does not prove AI caused the gap, and says purpose, frequency and classroom guidance change the result. On 8 September 2026, the OECD published PISA 2025 Results (Volume I), based on more than 760,000 students across 91 countries and economies. The assessment focused on science and also covered reading, mathematics and learning in the digital world among 15-year-olds.