Letta

Letta is an open-source platform and a powerful alternative to Claude, Perplexity, ChatGPT, and LangChain. It’s designed to be the operating system for AI agents, giving developers the tools and infrastructure to build production-ready, stateful agents. With support for long-term memory, advanced reasoning, and easy integration with custom tools, Letta makes it easier to create smart, adaptable AI agents that go beyond simple prompts.

Key features include:

• Agent Development Environment (ADE): A visual environment for building and testing AI agents, allowing real-time observation and editing of agent state.
• Agents API and SDKs: Python and Node.js SDKs for programmatic agent creation, deployment, and management.
• Memory Blocks: Structured context management for consistent and usable agent memory.
• Model Agnostic Design: Build agents using any LLM and switch between providers without losing agent state.
• Tool Integrations: Support for custom tools and MCP (Model Control Plane) for extending agent capabilities.
• REST API Endpoints: Exposes agents as REST APIs for easy integration into applications.
• Production Versioning: Facilitates version control and updates for deployed agents.

Use cases include building production applications backed by agent microservices, enhancing LLM services with memory and reasoning, and creating AI agents for various tasks requiring statefulness and tool integration.