Letta
An open-source framework for stateful agents with long-term memory, formerly known as MemGPT. It gives agents transparent, persistent memory so they can remember facts across sessions, which general-purpose frameworks do not ship by default.
Strengths
- First-class long-term memory and stateful agents
- Transparent, inspectable memory management
- Runs as a server and works with local models
Weaknesses
- Specialised around memory, so it is more than simple agents need
- Adds a server component to run and maintain
- A younger project than the general-purpose frameworks
At a glance
- Licence
- Apache 2.0
- Pricing
- Open core
- Platforms
- macOS, Windows, Linux, Docker
- GPU required
- No
Links
Works with
See also
Entry last verified 30 July 2026.