Forward Future Tools Library
Letta
Letta provides persistent, stateful AI agents with memory, identity, tools, and multi-agent collaboration for developers and teams building long-running AI applications.
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letta.com·Free + paid plans·Checked 2026-08-23
›What is Letta?
Letta is an AI research lab and agent platform built around agents that retain memory and state across interactions. Its software includes Letta Agent, the Agent SDK, a CLI, cloud agents, remote sandboxes, shared memory, and integrations such as GitHub and Slack. Developers can build agents that use tools, manage context, and communicate with other agents.
›What are the pros and cons of Letta?
Strengths
Agents maintain persistent memory, context, and state across interactions
Self-directed memory management can adapt how agents store and use information
Supports independent agents, shared resources, and inter-agent communication
Provides visual agent development and testing through the Agent Development Environment
Offers self-hosting and developer controls alongside hosted app and API options
Trade-offs
Self-directed memory can behave unpredictably, including missing relevant memories or making unnecessary updates
The server-based architecture adds operational complexity compared with stateless agent frameworks
The learning curve is higher than simpler agent frameworks
Some parts of the platform may feel experimental as it transitions from a research project to a production platform
API usage adds variable charges for active agents, tool execution, and underlying model tokens
›What are Letta’s key features?
Persistent stateful agents that retain context and memory across interactions
Self-directed memory management and programmatic context management
Agent SDK, CLI, and desktop app for developing and operating agents
Multi-agent collaboration with shared agents and organization-level access controls
Remote sandboxes and bring-your-own-machine support
API access with API keys, automated workloads, and usage-based billing
Integrations for GitHub, Slack, custom channels, schedules, secrets, and external tools
›What are the best use cases for Letta?
Build assistants that remember users, conversations, and prior experience over time
Develop coding or computer-use agents that run in remote sandboxes
Create teams of agents that share resources and communicate with one another
Run automated agent workloads through the Letta API
Test and manage agents through the Agent Development Environment
›What is the pricing for Letta?
| Plan | Price | Details |
|---|---|---|
| Free | $0 /month | Limited agents and Letta Auto usage, with support for bringing your own API keys and external coding plans. |
| Pro | $20 /month | For personal use, with Letta Auto weekly and monthly quota, pay-as-you-go overage, and up to 20 stateful agents. |
| API Plan | $20 /month | For teams building on the Letta API, with unlimited agents, $0.10 per active agent per month, $0.00015 per second of tool execution, and API key authentication. |
| Teams Pro | $20 /seat/month | Adds teammates, shared agents, access control, and Letta Auto quota for teams. |
| Enterprise | Custom | Volume-based pricing with increased quotas, role-based access control, SAML/OIDC SSO, and dedicated support. |
LLM usage is charged separately based on the underlying model's token costs. API and other usage can incur pay-as-you-go charges.
Checked 2026-08-23 · source
›Who is Letta best for?
developersA strong fit for developers building agents that need persistent memory, tools, and long-running state.
small teamTeams can share agents, set permissions, and enable agents to communicate and collaborate.
enterpriseEnterprise deployments get custom volume pricing, higher quotas, SSO, role-based access control, and dedicated support.
soloIndividuals can start free with their own API keys or use the Pro plan for hosted sandboxes and Letta Auto quota.
Not for
- Teams looking for a simple, low-learning-curve agent framework may find Letta more complex than necessary.
- Organizations that require fully predictable API costs should account for usage-based agent, tool execution, and model charges.
