Letta
Open-source platform for building stateful AI agents with persistent memory from MemGPT creators.
Updated April 2026
Overview
- Website
- letta.com
- Segment
- Agent Frameworks & SDKs
- Posture
- Single-Agent SDKs
Product overview
Letta builds a memory-first framework and hosted API for creating stateful, personalized AI agents that learn and improve over time through persistent memory, model-agnostic orchestration, and tools like background subagents., Developers and teams use it via open-source self-hosting, desktop apps like Letta Code, or hosted services for production apps., It stands out with separation of data and compute, portable memory across LLM providers, and continuous learning beyond stateless sessions.
Revenue model
Freemium with open-source core; paid subscriptions from $20/mo (Pro/Max/API plans with quotas and pay-as-you-go usage for agents/tools/LLMs), Enterprise custom licensing.
Moat
- Proprietary Technology
- Switching Costs
- Scale Advantages
Letta's key competitive moat is its proprietary memory management platform that enables stateful, self-improving AI agents with model-agnostic flexibility, allowing rapid iteration, scalability to millions of agents, and separation of data from compute unlike vendor-locked competitors like OpenAI.