In the study, 1,052 participants were asked to complete a two-hour interview which covered a wide range of topics, from their personal life story to their views on contemporary social issues. Their responses were recorded and the script was used to train generative AI models – or “simulation agents” – for each individual. To test how well these agents could mimic their human counterparts, both were asked to complete a set of tasks, including personality tests and games. Participants were then asked to replicate their own answers a fortnight later. Remarkably, the AI agents were able to simulate answers with 85% accuracy compared to the human participants.