Letta
Free tierAn AI research lab building self-improving agents that remember everything and learn continuously.
Free tier available·All audiences·API available·Open source
Key strengths
Persistent, evolving agent memory and identityContinual learning — agents improve over time without retrainingGit-based memory versioning for reproducible context managementSleep-time compute for offline reasoning during idle periodsResearch-backed foundations from the creators of MemGPT at UC Berkeley
Free tier + paid plans
San Francisco, USA
Founded 2023
Self-hostable
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- Stateful agent development — Build agents that maintain persistent, versioned memory across sessions without manual state management.
- Continual learning pipelines — Deploy agents that improve in token space over time, reducing the need for costly full-model retraining cycles.
- Long-horizon task automation — Power multi-step, multi-session workflows where accumulated context is critical to task completion.
- Memory-augmented LLM applications — Augment existing LLM apps with git-backed, programmatically managed context repositories.
- Sleep-time reasoning systems — Enable agents to consolidate knowledge and plan during idle compute time, improving inference-time performance.
- Persona-driven AI products — Create AI agents with evolving identities, skills, and goals for use in customer-facing or internal-facing applications.