Open Source · Memory and Vector
Letta
by Letta
Stateful agents with first-class memory. The continuation of MemGPT, productionised.
Our verdict
We have not reviewed Letta yet
No one at Enterprise DNA has checked this listing against its sources. The description comes from public listings gathered automatically. Any fact below shows where it came from and when it was last checked.
From the listing
About Letta
Letta is the production evolution of the MemGPT research project. Its core abstraction is the stateful agent: a long-lived entity with explicit memory tiers (core memory, archival memory, recall memory) and an inspectable state. The right pick when an agent has to remember things across sessions.
Best for
Anyone building persistent agents whose memory matters
Use cases
- Build a long-lived assistant that remembers user preferences over weeks
- Operate agents whose value compounds with accumulated context
- Replace ad-hoc 'history in prompts' with structured memory
- Inspect and edit agent memory directly
Notes
Why it matters
Most agent frameworks treat memory as 'whatever fits in the context window.' Letta makes memory a first-class system primitive. For long-lived agents, that distinction is the whole product.
How teams use it in production
Pin the structured memory schema to your domain. Audit core memory weekly. Use archival memory as the source of truth for facts the agent should know.
What to watch
Memory as a first-class agent primitive is becoming the next frontier. Letta, mem0, and Cognee are the live contenders.
Pros
- Explicit memory tiers, no hidden state
- Strong research lineage in MemGPT
- Memory is inspectable and editable, not a black box
- Python and TypeScript both supported
Cons
- Memory model has a learning curve
- Smaller community than the orchestration frameworks
- Overhead is real for short-lived agents
Key facts
What we have checked
- Latest version
- 0.16.8 (released 14 May 2026)
- Days since the last commit
- 18
- GitHub forks
- 2,669
- GitHub stars
- 25,369
- Days to a first reply on issues
- 50.3
- Open issues
- 0
- Releases in the last 90 days
- 0
Each value shows when we last confirmed it and where it came from. Values we have not confirmed are left out, never guessed.
Stars and usage
How Letta is growing
24,892 to 25,369
Health and security
Is Letta looked after, and what do its setup files show
Health score
56 out of 100
| Part | Points | What we saw |
|---|---|---|
| Recent activity | 30 of 30 | Last push 18 days ago |
| Releases | 0 of 15 | 0 releases in 90 days |
| Issue replies | 0 of 20 | First reply in 50.3 days (median) |
| Maintainer | 15 of 15 | Owned by an organisation |
| Official source | Not counted | MCP servers only |
Alternatives
Alternatives to Letta
| Record | Type | How we know | Checked |
|---|---|---|---|
| mem0Alternative to this | Open source | Named in the listing | Not dated |
Compare
Compare Letta side by side
Sources
Where this comes from
A source shows what was published when we checked it. It does not certify security, performance or a working installation. Read our method.
Changelog
What changed
Released 0.16.8
Released 0.16.7
Released 0.16.6
Released 0.16.5
Released 0.16.4
Released 0.16.2
Released 0.16.1
Released 0.16.0
Released 0.15.1
Released 0.15.0
Open-source & AI alternatives
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