Framework
Letta
Letta is an open-source AI framework, launched in 2023, made for developers and businesses.
A platform for building stateful agents with long-term memory that learn over time.
Main jobs: Build AI agents, Long-term memory for agents. It is open source and free to use. You can use it on your own server, offline on your own machine, through an API, in the terminal, as a desktop app and in the browser.
Markdown version of https://godooo.ai/en/framework/letta. Every page on this site has one: add .md to its address.
At a glance
- Type
- Framework
- Launched
- 2023
- Galaxy
- Agents & Automation
- Open source
- Yes · Apache-2.0
- Source code
- github.com/letta-ai/letta
- GitHub stars
- 24,867
- How you run it
- Self-host · Runs offline · API · Terminal · Desktop · Web
- Made for
- Developers · Businesses
- Website
- docs.letta.com
- Also known as
- MemGPT
What it can do
Build AI agentsmain jobunconfirmed
“Use Letta to create coding agents, personal assistants, AI coworkers, and stateful agents embedded in your own applications.”— docs.letta.com, 2026-09-24
Long-term memory for agentsmain jobunconfirmed
“Build stateful agents with memory that can learn and improve over time.”— github.com, 2026-09-24
Agentic codingsupportedunconfirmed
“”I want an AI coding assistant””— docs.letta.com, 2026-09-24
unconfirmedproposed by a machine, awaiting calibration
Alternatives
- Claude Agent SDKOpen source, freeAlso does: Build AI agents, Agentic coding, Long-term memory for agents
- LangGraphOpen source, freeAlso does: Build AI agents, Long-term memory for agents
- OpenAI Agents SDKOpen source, freeAlso does: Build AI agents, Long-term memory for agents
- AgnoOpen source, freeAlso does: Build AI agents, Long-term memory for agents
- CAMELOpen source, freeAlso does: Build AI agents, Long-term memory for agents
- MastraOpen source, freeAlso does: Build AI agents, Long-term memory for agents
- Strands AgentsOpen source, freeAlso does: Build AI agents, Long-term memory for agents
- AutoGenOpen source, freeAlso does: Build AI agents
- AutoGPTOpen source, freeAlso does: Build AI agents; no code needed
- Coze 扣子Free plan + paid upgradesAlso does: Build AI agents; no code needed
- DifyOpen source, freeAlso does: Build AI agents; no code needed
- LangChainOpen source, freeAlso does: Build AI agents
Connections
- Applies
- Context Engineering
Questions
What is Letta?
Letta is an open-source AI framework, launched in 2023, made for developers and businesses. A platform for building stateful agents with long-term memory that learn over time.
Is Letta free?
Yes. Letta is open source (Apache-2.0) and free to use.
Is Letta open source?
Yes, under the Apache-2.0 license. The source code is at https://github.com/letta-ai/letta.
Can Letta run locally?
Yes. Letta can run offline on your own machine. It can also be self-hosted on your own server.
What can Letta do?
Main jobs: Build AI agents, Long-term memory for agents. It can also do: Agentic coding.
What are open-source alternatives to Letta?
Open-source ones: Claude Agent SDK, LangGraph, OpenAI Agents SDK, Agno, CAMEL, Mastra, Strands Agents and AutoGen. Others: Coze 扣子.
Sources
- docs.letta.com/checked 2026-09-24
- github.com/letta-ai/lettachecked 2026-09-24