Letta
Machines that learn
Letta is an AI research lab whose platform lets users create stateful agents that preserve identity and state over time, remember context, and improve with experience. Its research on memory models, context management, and continual learning is delivered as software through Letta Agent, a self-improving agent whose memory, identity, and capabilities evolve as it works.
The product is available as an app, CLI, and web app, with an API for developers. Letta Auto routes requests across models for chat and coding workloads, and users can bring their own API keys or external coding plans. Agents can run in remote sandboxes, share agents across a team with permissions, and communicate with one another within an organization. Server-side tools, web search and fetch, and remote MCP tools are supported, with usage tracked through credits.
Letta is packaged for individuals, teams, and developers. A free plan covers a limited number of stateful agents with limited Letta Auto usage and BYOK support; a Pro plan raises agent limits and adds remote sandboxes and Letta Auto quota with pay-as-you-go overage. Teams Pro adds shared resources and organization members, while developer plans are usage-based for API workloads with API key authentication.
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