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letta

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

by letta-ai · GitHub
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aiai-agentsllmApache-2.0
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In plain words

Letta (formerly MemGPT) is a framework and server for building stateful agents with long-term memory that persists across sessions, with a visual agent editor.

From the README

Install
npm install -g @letta-ai/letta-code
Documentation ↗

Excerpts from the project README on GitHub. Copyright and licensing remain with the respective authors.

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24.5k23.6k
2026-06-282026-08-31
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📄 About

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

letta has 24.5k stars on GitHub. It has been forked 2.6k times. It has been in active development since 2023. letta is available under the Apache-2.0 license. Its main topics are ai, ai-agents, llm, llm-agent.

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Frequently asked questions

What is letta?

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

Is letta open source?

letta is an open-source project. It is released under the Apache-2.0 license.

Is letta free?

Yes. letta is free and open source — you can use, modify and self-host it.

What license does letta use?

letta is available under the Apache-2.0 license.

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