blog: Best Open-Source Agent Memory Systems (Self-Hosted, 2026) - #3192
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A fair, benchmark-grounded comparison of the self-hostable open-source agent memory systems (Hindsight, Mem0, Graphiti/Zep, Letta, Cognee): comparison table, per-system profiles, "what self-hosted really costs", FAQ, and a "when to pick each" guide. Every stat/claim verified against live sources (GitHub stars, licenses, Zep CE deprecation, benchmarks). Swiss-type cover. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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New blog post: Best Open-Source Agent Memory Systems (Self-Hosted, 2026) — a fair, benchmark-grounded comparison of the self-hostable open-source agent memory systems (non-integration, commercial-investigation intent).
The angle
The SERP for "open source agent memory" is full of vendor-biased roundups (Cognee publishes posts ranking Cognee #1). The differentiated move is the honest one: lead with reproducible benchmarks and real self-hosting cost, and give competitors genuine credit. Fairness is the wedge.
What's in it
Accuracy
Every stat and claim was verified against live sources (GitHub stars/licenses on 2026-08-05, Zep CE deprecation, Graphiti bi-temporal model, Letta memory-blocks/MemGPT lineage, Cognee ECL + defaults, Hindsight 94.6% LongMemEval / #1 BEAM / four strategies = semantic·BM25·graph·temporal). Notably corrected a stale Mem0 benchmark figure and its self-hosting description, and reframed accuracy around BEAM at 10M (where LongMemEval is now saturated). Hindsight explicitly does not claim community leadership (Mem0 leads on stars) — that honesty is the point.
Quality
Publishes to:
/blog/2026/08/05/open-source-agent-memory-systems