Short AI-quoted essay phrases are more often altered than long ones, study finds

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An analysis of 8,946 IELTS essays with feedback from the GLM-4.7 model checked whether quoted student text was accurately reproduced. Short quotes of 4-6 words that were close copies altered a word about 3.2% of the time, versus 0.74% for quotes of 11 or more words. Changed long quotes were more often loose rewordings rather than near-exact copies with a single word changed. The author had predicted the opposite pattern in both measures, and the results contradicted those predictions. The findings are limited by small counts for long quotes, a similarity-band measure that cannot assess meaning, and coverage of one model on one exam.

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