API or serverAI and agent development

letta

Build stateful agents that retain memory and adapt over time.

Stars
23,731
Forks
2,511
License
Apache-2.0
Updated
Updated Jul 10, 2026

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Project overview

Letta offers a CLI and TypeScript Agent SDK for running agents with advanced memory, either fully locally, in its cloud, or against a self-hosted App Server. This repository mainly retains the legacy Letta Server behind the V1 API and SDKs; active development has moved to the Letta Agent repository, and new projects are encouraged to use the newer Agent SDK.

Repository facts

Primary language
Python
License
Apache-2.0
Repository updated
Jul 10, 2026
Default branch
main

Resource types

API or server

Use cases

AI and agent development

Capabilities

Memory

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