vectorize-io/hindsight: Agent Memory That Learns — Biomimetic Architecture Achieves State-of-the-Art on LongMemEval

GitHub·high signal

Hindsight is an open-source agent memory system with biomimetic data structures: World (facts about the world), Experiences (the agent's own session history), and Mental Models (synthesized beliefs formed by reflecting on raw memories). It ships with Retain, Recall, and Reflect primitives and claims state-of-the-art performance on LongMemEval — the standard benchmark for conversational memory systems. Trending on GitHub since March 15, it explicitly ships a CLAUDE.md and multi-language SDKs, positioning itself as a drop-in memory layer for Claude-based agents.