Letta

A platform for building stateful AI agents with persistent memory and transparent reasoning.

Automation & Agents AI AgentsFreemium

Visit website ↗

$0.10Starting price

79KMonthly visits

32Popularity

About Letta

Letta is a developer-focused platform for constructing advanced stateful AI agents that retain persistent memory across sessions. Unlike traditional stateless LLMs, these agents maintain context and provide explainable reasoning processes, enabling more natural and personalized interactions. The platform supports long-term memory capabilities, allowing agents to remember past interactions and adapt responses accordingly. Letta’s model-agnostic design offers flexibility by working with any language model, while its ‘white box’ approach separates internal reasoning from user-facing communication for improved debugging and transparency. Developers can integrate custom tools, external databases, and APIs to automate complex workflows, making it suitable for building enterprise chatbots, virtual assistants, or research agents. The platform emphasizes scalability and production-ready deployment, ensuring reliable performance in enterprise environments. Organizations leverage Letta to create conversational AI systems that require persistent context, personalization, and robust integration capabilities.

Key features

Persistent memory across sessions
Transparent reasoning processes
Model-agnostic design
Custom tool integration
External database and API connectivity
White box reasoning for debugging
Scalable deployment for production
Long-term context retention
Personalized interaction capabilities
Enterprise-grade chatbot and assistant building

Use cases

Building enterprise chatbots with persistent context
Creating virtual assistants for customer support
Developing research agents with explainable reasoning

Pros

Enables persistent, long-term memory for AI agents across sessions
Model-agnostic design works with any language model
Supports custom tool integration, external databases, and APIs
Provides transparent, explainable reasoning processes
Offers scalable deployment options for enterprise environments

Cons

Free plan limits users to 3 stateful agents
Pro and developer plans require usage-based pricing for advanced features
Complexity may pose a learning curve for developers new to stateful agents

Frequently asked questions about Letta

What is Letta and what does it do?

Letta is a platform for building advanced stateful AI agents that retain persistent memory across sessions. It enables agents to remember past interactions, adapt responses, and improve over time through continual learning.

Who is Letta designed for?

Letta is designed for developers and organizations building conversational AI systems, enterprise chatbots, virtual assistants, or research agents that require persistent context and personalization.

How does Letta handle pricing?

Letta offers a free plan with limited features, a Pro plan for personal use with additional quotas, and usage-based pricing for developers and teams. Enterprise plans provide custom volume-based pricing and dedicated support.

Can Letta integrate with external tools and APIs?

Yes, Letta supports integration with custom tools, external databases, and APIs to automate complex workflows, making it suitable for enterprise applications.

What is Letta Auto?

Letta Auto is a feature that selects frontier models balancing general intelligence, coding knowledge, and speed. It offers specialized routes like Auto Chat for non-coding workloads or Auto Fast for optimized speed.

How do I get started with Letta?

Users can start with Letta for free using their own API keys or external coding plans. Documentation and quickstart guides are available to help developers begin building stateful agents.