Zep

Zep's memory system is split into two things buyers often conflate. Graphiti is the open-source temporal knowledge graph library (Apache 2.0, github.com/getzep/graphiti) that builds and queries a graph of facts with validity windows — it can invalidate a fact automatically when new information contradicts it, rather than just appending. It's actively maintained: 30,100 stars, 3,000 forks, and a commit pushed within the last two days as of this check. Zep Cloud is the separate, closed-source managed product built on top of it — Zep calls this the 'Context Graph Engine' — adding multi-tenant storage, retrieval at claimed sub-200ms latency, access control, retention policies and audit trails. You can self-host Graphiti; you cannot self-host the governed, multi-tenant Zep service.

Zep previously shipped a self-hostable 'Zep Community Edition.' The company discontinued it on April 2, 2025, stating it would 'stop maintaining and releasing Zep Community Edition' and focus open-source effort entirely on Graphiti instead. The old repository (github.com/getzep/zep) is still public under Apache 2.0 but receives no updates — it's now labeled as examples and integrations, not the product. Anyone evaluating Zep today based on older blog posts or tutorials describing a self-hosted deployment is describing a discontinued path; the only deployment options now are managed cloud, bring-your-own-key, or bring-your-own-cloud (BYOC) inside your VPC, the last of which is an Enterprise-tier custom arrangement, not self-serve.

Pricing is public and denominated in credits (roughly, 1 credit per 350-byte chunk of data ingested — a 'episode'). Free: 10,000 credits/month, 2 projects, 5 custom entity/edge types, community support. Flex: $104/month ($1,250/year), 50,000 credits/month, 30-day rollover, 600 req/min, 5 projects. Flex Plus: $312/month ($3,750/year), 200,000 credits/month, 60-day rollover, 1,000 req/min, adds observations, custom extraction, webhooks and analytics. Enterprise is custom-priced and adds negotiated rates, guaranteed SLA, unlimited projects, audit logs, SOC 2/HIPAA and BYOC. Storage and retrieval themselves are unmetered — you pay for ingestion volume, not query volume.

Zep's site currently claims 94.7% accuracy on the LoCoMo memory benchmark and 90.2% on LongMemEval. These numbers have a documented history of dispute: in May 2025, Mem0's co-founder filed a public issue against Zep's benchmark repo arguing that an earlier 84% LoCoMo claim was inflated by roughly 26 percentage points due to including excluded adversarial-category questions, inconsistent prompts between Zep and baseline models, and reporting a single run instead of an average of ten — recalculating Zep's own number at 58.44% ± 0.20 under matched conditions. Zep's public response (a blog post titled 'Is Mem0 Really SOTA in Agent Memory?') did not directly rebut that recalculation; it instead cited a different corrected figure of 75.14% ± 0.17 and disputed Mem0's methodology in turn. No third party has published an independent replication of either side's numbers. Treat the marketing figures — on both sides of this dispute — as vendor claims, not settled facts.

Zep publishes SOC 2 Type II certification and offers HIPAA Business Associate Agreements, with attestation reports and security documentation hosted on a real trust center (trust.getzep.com, confirmed live) rather than just marketing copy. These are only available at the Enterprise tier alongside audit logs and BYOC deployment; Free and Flex customers get none of this.

Zep AI is a 2023-founded, YC W24 company. Reported funding figures disagree across sources ($500K seed per Crunchbase, $2.3M per PitchBook) and neither could be verified against a primary source, so treat the exact amount as not established — but by either figure this is a small, early-stage vendor, not a well-capitalized one. On the positive side, S&P Global Market Intelligence (451 Research) published paid-analyst commentary on Zep in April 2026 (hosted on Zep's own site, not independently re-hosted) describing it as a plausible 'de facto partner' in the enterprise agent memory layer. Independent user evidence is otherwise thin: no G2 product listing or review count could be found for Zep itself (a G2 search surfaces an unrelated product, 'ZEPIC'), and no substantive independent Reddit or forum discussion turned up in search.