Stay free if you only need basic agent creation and limited memory storage. Upgrade if you need 20x higher limits on letta auto and increased quota for frontier models. Most solo builders can start free.
Why it matters: Requires technical knowledge for setup and configuration
Available from: Pro ($20/month)
Why it matters: Memory management complexity can be overwhelming for beginners
Available from: Pro ($20/month)
Why it matters: Self-hosted deployment requires ongoing maintenance
Available from: Pro ($20/month)
Why it matters: Usage costs can accumulate with heavy memory operations
Available from: Pro ($20/month)
Unlike ChatGPT or Claude which forget conversations after each session, Letta agents maintain persistent memory across all interactions. They remember your preferences, past conversations, and context indefinitely, creating truly personalized AI relationships.
Yes, Letta is model-agnostic and supports all major LLM providers including OpenAI, Anthropic, Google, and open-source models. You can even transfer agent memory between different providers.
Letta offers both cloud-hosted and self-hosted options. For maximum security, you can deploy the open-source framework on your own infrastructure with complete data control. Cloud deployments use encryption and secure protocols.
Letta offers a free tier for basic usage, with paid plans starting at $20/month for 20 stateful agents. Enterprise API plans are available for organizations. Self-hosting is free with the open-source framework.
LangChain is excellent for complex workflows and has a large ecosystem, but lacks persistent memory. Letta focuses specifically on stateful agents that remember and learn over time, making it better suited for long-term AI relationships.
Start with the free plan — upgrade when you need more.
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Last verified March 2026