Directory / Letta
Letta
Verified
Stateful agent framework with long-term memory.
Letta, formerly MemGPT, is an open-source framework and service for agents with long-term memory. It includes a self-hosted control plane and focuses on agent state; a separate execution layer handles repository changes.
- Model support
- Multi-model
- Deployment
- Cloud, Self-hosted
- Open source
- Yes
- License
- Apache-2.0
- Pricing model
- Mixed
- Added / updated
- 19 Aug 2026 / 19 Aug 2026
www.letta.com · Docs · Source
Assessment
Letta fits workflows where persistent agent state matters across runs. Coding harness, sandbox, and merge gate functions remain separate components.
Strengths
- Memory-first agent runtime you can self-host.
- Apache-2.0 core.
- Model-agnostic.
Limitations
- Sandbox and merge policy require separate tooling.
- Commercial cloud vs OSS split.
- Memory quality requires independent evaluation.