Simile CEO on Latent Space: 1,000 Digital Twins Reproduce Human Survey Answers at 85% Accuracy, Frontier Models Manage 20-60%
Joon Sung Park, of Generative Agents fame, describes building digital twins of 1,000 representative US citizens that match people's own retest responses about 85% as accurately as the people themselves, across behavioral economics games, personality tests and RCTs, while frontier models sit at 20-60% on niche populations. The explicit design inversion is that Simile does not optimize for rationality, it optimizes for realistic human behavior including bias and error, built from three data buckets: interviews, observational and transactional behavior, and RCTs that capture causal mechanism. The company is roughly 60 people at a $2B valuation with Fortune 100 customers running concept tests and earnings-call modeling.
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