How does Soul remember things?

Soul remembers like a person, not like a database.

Most AI was given perfect recall without the ability to forget. Mention something once, and it can keep coming up forever. That distorts how the model treats you. Soul is designed to avoid that.

What that means in practice

  • Small details fade unless they come up again.
  • Things that matter stick.
  • Memory has friction and texture, the way human relationships do.

Soul is state of the art on persona-centric memory benchmarks, including PersonaMem, Cognitive Eval, and LongMemEval-S. The research write-up is Making Human Memory, and the paper is Making Human Memory (PDF).

Companion, not assistant

An assistant needs frictionless, high-precision recall. A companion needs memory that feels real. That is why Soul uses saliency-weighted decay rather than storing every word you have ever said with equal weight.

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