Letta

Letta is an AI research lab that builds self-improving AI agents with persistent memory, continuous learning, and evolving capabilities, envisioning a future where humans coexist with digital people that remember everything, learn continuously, and improve themselves over time. The company's research originates from MemGPT, the seminal work on virtual context management for LLMs published in October 2023, and has since produced foundational research including Memory Models for agent learning through memory-native reinforcement learning, Context Constitution principles governing how AI agents manage context to learn from experience, Context Repositories using git-based memory with programmatic context management and versioning, Continual Learning in Token Space as the key to building agents that truly improve over time, and Sleep-time Compute enabling agents to reason about context during idle time rather than at inference. Letta ships its research as software through Letta Agent, a self-improving AI agent whose memory, identity, and capabilities evolve with experience, accessible through desktop and CLI interfaces with background memory subagents that improve prompts, context, and skills over time. The agent's memory can be viewed, modified, and ported across different models. Letta Agent is deployed in production at companies including Bilt, 11x, Kognitos, and Hunt Club. Founded by the creators of MemGPT from UC Berkeley's Sky Computing Lab, the birthplace of Spark and Ray, and advised by Ion Stoica and Joey Gonzalez, Letta is backed by Jeff Dean, Clem Delangue, Cris Valenzuela, and other prominent AI leaders. Founded in 2023 and headquartered in San Francisco, California, Letta has raised $10.0M in Early Stage funding from investors including Felicis Ventures, Essence VC, and Sunflower Capital.