Machine Heart

Apr 6, 2026 · Artificial Intelligence

Introducing LifeSim: The First Long‑Horizon User Life Simulator Redefining Personalized LLM Evaluation

LifeSim introduces a long‑horizon user life simulation framework that jointly models user cognition via a BDI engine and external environment, enabling realistic evaluation of personalized LLM assistants through the LifeSim‑Eval benchmark, which reveals current models excel at explicit intents but struggle with hidden intents and long‑term user understanding.