Letta
Letta is a platform for building stateful AI agents with transparent, persistent memory (rooted in the MemGPT research). It ships a developer-first Agent Development Environment (ADE) for designing, observing, and editing agent state in real time, plus a REST API and Python/TypeScript SDKs to deploy agents as microservices. Agents are model-agnostic, support custom tools, and can connect to external tool libraries through Model Context Protocol (MCP).
You can self-host from the open-source repo or use Letta Cloud to create, version, and operate agents at scale with templates, monitoring, and observability. A cross-platform Letta Desktop app is available for local development. The platform supports BYO LLM API keys, filesystem-backed knowledge, multi-agent patterns with shared memory, and portability via an agent file format.
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Demo Video for Letta
Developer
Pricing and Plans
Free
- 50 premium requests / month
- 500 standard requests / month
- 100 active agents
- 2 agent templates
- 1 GB storage
- BYO LLM keys (usage not counted against quota)
Pro
- 500 premium requests / month
- 5,000 standard requests / month
- 10,000 active agents
- 20 agent templates
- 10 GB storage
- Monitoring & observability (cloud)
Scale
- 5,000 premium requests / month
- 50,000 standard requests / month
- 10,000,000 active agents
- 100 agent templates
- 100 GB storage
- Advanced ops & team workflows
Enterprise
- Custom quotas and private model deployments
- SAML/OIDC SSO
- Role-based access control (RBAC)
- BYOC deployment options
- Dedicated support