Provider pricing

Letta AI API pricing

Letta (formerly MemGPT, from the UC Berkeley research project) is a stateful agent runtime that gives any LLM persistent long-term memory, tool use, and the ability to self-edit its own context. The hosted Letta Cloud is priced per agent-step with free dev usage; the open-source server is Apache 2.0 and works with OpenAI, Anthropic, Google, and any local model.

Founded2023
HeadquartersSan Francisco, CA
Tracked modelsDirectory

Best for

Builders of long-running personal assistants, customer-support agents, or research copilots that must remember across sessions.

Strengths

  • Persistent agent memory — core, archival, and recall layers managed by the LLM itself
  • Provider-agnostic — swap OpenAI, Claude, Gemini, or local models per agent
  • ADE (Agent Development Environment) for inspecting and editing agent state visually
  • Apache 2.0 server keeps self-hosted deployments fully unlocked