Letta
Verified liveFramework for agents with long-term memory.
Some links are affiliate links; we may earn a commission at no cost to you — it never affects rankings. Disclosure.
Letta at a glance
- Category
- Agent Frameworks
- Starting price
- Free
- Pricing model
- Open source
- Best for
- Developers building custom AI agents
One of 17 Agent Frameworks tools we verify live.
What is Letta?
An open-source framework (formerly MemGPT) for building stateful agents with persistent long-term memory. Includes a server and agent development environment for memory-centric agents.
Pros
- Advanced memory management
- Stateful agents
- Research pedigree
Cons
- Memory-focused niche
- Evolving from MemGPT
Top Letta alternatives
- Agno — Fast, lightweight framework for multimodal agents.
- Claude Agent SDK — Anthropic’s SDK for building agents on Claude.
- CrewAI — Framework for orchestrating role-playing agent crews.
- DSPy — Framework for programming, not prompting, LLMs.
- Griptape — Python framework for agents, pipelines, and workflows.
- Haystack — Open-source framework for LLM search and agents.
Compare Letta
Letta FAQ
What is Letta?
An open-source framework (formerly MemGPT) for building stateful agents with persistent long-term memory. Includes a server and agent development environment for memory-centric agents.
How much does Letta cost?
Letta is open source, so it's free to self-host. Confirm current pricing on the Letta website.
Is Letta free?
Yes — Letta is open source and free to self-host.
What are the best Letta alternatives?
Top Letta alternatives include Agno, Claude Agent SDK, CrewAI. See the full list of agent frameworks alternatives on ToolMagpie.
Ready to try Letta?
Developers building custom AI agents · from Free
Visit Letta →