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Stateful AI agents with persistent memory
Updated
Letta is an AI company in San Francisco that builds stateful agents whose memory and capabilities improve with experience. It grew out of the MemGPT research and offers Letta Code and a hosted API.
Developers install Letta Code or call the Letta API to create agents whose memory persists. Usage consumes credits based on the underlying model's API pricing, or runs on your own API keys.
Developers and teams building long-running agents use it. Case studies on the site include Bilt, 11x, Kognitos and Hunt Club.
Letta has a Free plan at $0 for up to 3 stateful agents, a Pro plan at $20 a month with $20 in credits and 20 agents, Teams Pro at $20 per seat a month, and custom Enterprise pricing. Server-side tools cost $0.00015 per second of CPU time.
Letta works with model providers through bring-your-own API keys, supports remote MCP tools and offers SDKs. The homepage does not list specific integrations.
LangChain and LlamaIndex are open-source frameworks for building agents and retrieval, with memory as a component. CrewAI focuses on multi-agent workflows. E2B and Browserbase provide sandboxes and browsers for agents.
Pricing Model
Quote-based
Starting Price
Contact vendor
Free Options
Free version, Free trial
| Feature | Free | Pro | Teams Pro | Enterprise |
|---|---|---|---|---|
| Up to 3 stateful agents | , | , | , | |
| 5 MiB per memory repository | , | , | , | |
| Bring your own API keys | , | , | , | |
| $20 a month | , | , | , | |
| $20 in monthly credits | , | , | , | |
| 20 stateful agents | , | , | , | |
| $20 per seat a month | , | , | , | |
| Shared agents | , | , | , | |
| Access controls | , | , | , | |
| Role-based access control | , | , | , | |
| SAML/OIDC SSO | , | , | , |
API Types
SDK Availability
Verify SDK availability in vendor's documentation.
Developer Features
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Compliance Standards
SOC 2 Type II
EnterpriseISO 27001
EnterpriseGDPR Compliant
GlobalHIPAA
HealthcarePCI DSS
FinanceCCPA
PrivacyFedRAMP
GovernmentCSA STAR
CloudDeployment & Data
Data Residency Options
Verify with vendor for your specific region requirements.
