Letta / MemGPT

Stateful LLM agents with persistent long-term memory

Letta (formerly MemGPT) is a framework for building LLM agents with persistent, self-editing memory. It enables agents to maintain coherent context across unlimited conversations by managing an in-context memory window and larger archival storage. Letta's stateful agents can remember personal details, preferences, and past interactions — making them ideal for long-running personal assistants and customer service bots.