Mem0 vs Zep vs LangChain Memory vs Letta: Which One Actually Remembers?
This story is from 2026-08-26. It is preserved in the archive; the latest stories are on the live feed.
Most "AI memory" demos are a vector store with a marketing label. You embed every message, cosine-search the top-k on the next turn, and call it memory. It works until turn 40, when the agent confidently tells a user their favorite color is blue because that's what came back highest-ranked — even t…
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- 2026-08-26 20:03 · DEV Community — Machine Learning
Mem0 vs Zep vs LangChain Memory vs Letta: Which One Actually Remembers?