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Where Agent Memory Is Heading in 2026: Files Beat Vectors, Forgetting Just Started

In H1 2026, OpenAI, Anthropic, Letta, and LangChain independently chose Markdown files + indexes over vector databases; write permissions shifted back to humans; forgetting mechanisms appeared but nobody implemented Ebbinghaus; Penfield Labs caught 6.4% wrong answers in LoCoMo; three vendors simultaneously adopted 'Dreaming' for offline memory consolidation. Five trends, one conclusion: memory is not a feature — it is an architecture decision.

OpenClaw Sessions and Memory: One Rolling Conversation, Plus Four Files That Get Written to Disk

By default every DM lands in one main session, and group activity and background work report back into it. Memory is entirely Markdown on disk — the model only remembers what gets saved, with no hidden state. But if more than one person can DM your agent, DM isolation is something you have to turn on.