Full Society Simulation - Researcher Clones Human with AI (youtube.com)
The second study did 2-hour interviews of people, used generic social science tests (I guess to develop points of their personality), converted this into the AI agents, then ran the simulation, and later asked the agents and the people questions and compared how similar they were to the agent based on their 2-hour interview. Accuracy of 0.79 on GSS.
He talks of building a massive simulation, testing out a new tax plan, and seeing how the personalities react.
They did some work to tackle bias against minorities for political ideology in their study.