Letta vs Zep
| Tagline | Build stateful agents with long-term memory | Context engineering and memory for AI agents |
|---|---|---|
| Category | AI Agents | AI Agents |
| Pricing | Open Source | Freemium |
| Upvotes | 0 | 0 |
| Comments | 0 | 0 |
| Page views | 0 | 0 |
| Click-through to site | 0.0% | 0.0% |
| Readiness Score | 95/100 | 100/100 |
| Launched | Oct 5, 2026 | Oct 5, 2026 |
| Maker | — | — |
What is Letta?
Letta, formerly MemGPT, is a platform for agents that keep persistent memory across sessions and manage their own context.
What is Zep?
Zep provides long-term memory for agents using a temporal knowledge graph built from conversations and business data.
Not sold on either? See alternatives to Letta or alternatives to Zep.
Verdict
Zep leads on 1 of the measurable metrics above (votes, engagement, click-through and readiness). Choose Letta if you want build stateful agents with long-term memory; choose Zep if you want context engineering and memory for AI agents.
Is Letta better than Zep?
On AskableHQ's community and engagement data, Zep currently performs better, but the right choice depends on your use case.
Which is cheaper, Letta or Zep?
Letta is Open Source; Zep is Freemium. Check each website for current plans.