Letta
A platform and open-source framework for building, hosting and running stateful agents with persistent memory, context management and tool execution. Agents can run in the managed cloud, a self-hosted app server, or fully local backends.
- Website
- https://www.letta.com/
- Who it's for
- Developers who need long-running, memory-persistent agents deployable across managed cloud, self-hosted or local backends.
- Pricing
- Free $0/mo (limited agents, bring your own key); Pro $20/mo (up to 20 stateful agents); Developer plan $20/mo (unlimited agents, $0.10 per active agent/mo, $0.00015/sec tool execution); Teams $20/seat/mo; Enterprise custom.
- Category
- Agent operations
- Last verified
- 2026-10-22 (current)
- Confidence
- high
Key facts
- Stateful runtime persists memories, tools and messages in a database
- Context management via compaction, rewriting and offloading
- Agents can run on a managed sandbox, a self-hosted app server, or a registered computer
- Supports horizontal scaling on Kubernetes with connection pooling
- MCP tool execution supported; bring-your-own-key models on all plans
Sources
Every claim above is drawn from these; we do not publish unsourced specifications.
- https://docs.letta.com/pricing
- https://www.letta.com/blog/introducing-the-letta-agent-sdk/
- https://aws.amazon.com/blogs/database/how-letta-builds-production-ready-ai-agents-with-amazon-aurora-postgresql/
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