The study collected 62,090 real conversations from 668 ChatGPT users. Participants also completed a standard personality test, giving the researchers a baseline to measure against. The AI was then trained to classify each user as low, medium, or high across the five traits: openness, conscientiousness, extraversion, agreeableness, and neuroticism. The fine tuned model beat random chance across all five traits, with extraversion being the easiest to predict, achieving up to 44% higher accuracy...
