Letta

Letta (formerly MemGPT) is a framework for building AI agents that manage their own memory — deciding what to store, recall, and forget across conversations and sessions. Agents built on Letta can improve over time as their memory cores are updated by experience, making them suitable for long-horizon tasks and personalized assistants. The framework is open source and supports deployment via a REST API, with Letta Cloud offering a managed hosted option. It is popular in research and enterprise AI agent projects.