letta-ai

Platform for stateful agents: AI with advanced memory that can learn and self-improve over time.

Agents that self-improve with experience

Give Claude Code a subconscious

Agent File (.af): An open file format for serializing stateful AI agents with persistent memory and behavior. Share, checkpoint, and version control agents across compatible frameworks.

Archived - has been replaced by Letta Code channels/schedules!

Convert sessions across harnesses to a unified trajectory format - designed to be consumed by agents (e.g. for memory formation, dreaming, search)

A shared repository for skills. Intended to be used with Letta Code, Claude Code, Codex CLI, and other agents that support skills.

accompanying material for sleep-time compute paper

The Letta Agent SDK is the SDK for stateful agents. Each agent has its own identity and long-term memory, and keeps both across conversations, models, and the computers it runs on.

An example chatbot application built on the Letta API, which makes each chatbot a stateful agent (agent with memory) under the hood.

Viva la machina.

An open-source demo UI built on top of the Letta Agent SDK

Evaluation kit for testing stateful agents

A powerful Obsidian plugin that integrates with Letta to provide a stateful AI agent that knows your vault contents and remembers your conversations

A Python SDK for accessing the Letta API