Letta
Free plan for stateful agents with memory in the Letta web app and CLI, using your own API keys.
AI Agents
What you get
Stateful AI agents that keep long-term memory (from the MemGPT team), in the web app and CLI: 3 agents, bring your own model keys or ChatGPT/Codex, Kimi or Z.AI coding plans.
How to get it
Follow the quickstart linked under Free on Letta's pricing page.
What it requires
Your own model API keys or coding plan for most use.
The catch
Only 3 agents and limited Letta Auto usage; model costs are on your own keys. Remote sandboxes and more agents need Pro, $20 a month. The Letta API platform has no free plan ($20 a month).
From the official page · checked Oct 29, 2026