Directory / Letta
Letta
Verified
Stateful agents with memory, from the MemGPT lineage.
Letta (formerly MemGPT) is an open-source framework and service for agents with long-term memory and a self-hosted control plane. It is about agent state, not about writing your pull requests.
- Model independence
- 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
Editorial take
Letta is listed because factories that forget context every run are expensive. Memory is not a coding harness. If you needed SWE-bench, this is the wrong aisle.
Strengths
- Memory-first agent runtime you can self-host.
- Apache-2.0 core.
- Model-agnostic.
Limitations
- Not a sandbox or merge gate.
- Commercial cloud vs OSS split.
- Memory quality is an eval problem you still own.