Letta

Letta

FreeNo cost to use — ever
Persistent multi-session memoryStructured memory managementMemory update and reflectionREST API deployment+1 more
Pricing
Free
No cost — ever
Features
5 listed
Key capabilities
Use Cases
4 listed
Identified use cases
Access
Web App
Browser-based
Listed on Nextool since Feb 2026

About Letta

"Open-source framework for building AI agents with persistent memory and stateful interactions"

Letta (formerly MemGPT) is an open-source framework for building stateful AI agents with persistent memory, enabling agents that remember past interactions, learn from experience, and maintain consistent personas over long conversations. Unlike stateless chatbots that forget context between sessions, Letta agents maintain structured memory including core identity, conversation history, and learned knowledge, updating their memory intelligently as they interact. The framework provides a deployment server, REST API, and management tools for running production agent services with full memory persistence.

Key Features

5
Persistent multi-session memory
Structured memory management
Memory update and reflection
REST API deployment
Persona consistency

Best For

4 use cases
Long-term AI companions
Personalized learning assistants
Customer relationship agents
Stateful enterprise AI assistants
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Official Links

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Tool Details

Pricing
Free
Platform
Web
Best For
Long-term AI companions
Features
5 listed
Categories
2
Website
letta.ai
Listed
Feb 2026
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