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Letta

Platform for stateful agents that learn from experience and keep their memory across sessions.

Infrastructure by Letta

IndexedApache-2.0★ 25,244
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Install

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pip install letta-client

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About

Letta (formerly MemGPT) builds stateful agents whose memory persists and improves with use. The agent harness is open source and can be used from a terminal CLI, a web app, Slack, Telegram and Discord channels, or TypeScript apps via the Letta Agent SDK. The App Server runs local or self-hosted agents, and Letta Cloud keeps agent memory available across computers.

Use cases: agent-memory

Reviews

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Fact sheet

Category
Memory · stateful agents
Self-host
Yesraw.githubusercontent.com
Open source
Yesdocs.letta.com
Protocols
mcp

Plans

Free$0limited agents, 5 MiB storage per memory repository, bring your own API keys
Pro$20/monthup to 20 stateful agents, Letta Auto quota, 50 MiB storage per memory repository
API Plan$20/monthunlimited agents, $0.10 per active agent per month, $0.00015 per second of tool execution, pay-as-you-go LLM usage
Teams Pro$20/monthper seat; shared agents with access control
EnterpriseContact salescustom volume pricing, role-based access, SAML/OIDC SSO

From the vendor's pricing page, read Oct 24, 2026.

Facts read from the vendor's own pages by claude-haiku-5-5 on Oct 24, 2026; a fact is shown only with the page it came from.

Signals

Stars
25,244
Forks
2,656
Open issues
0
Last commit
Oct 18, 2026 (10 days ago)
Last release
May 14, 2026 (5 months ago)

From GitHub (fetched Oct 24, 2026).

Details

Packages
pypi letta-clientnpm @letta-ai/letta-client
License
Apache-2.0
Repository
github.com/letta-ai/letta
Website
www.letta.com
Docs
docs.letta.com
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
READMEDocsPricing pageWebsitegithub-graphql

More from Letta

Cite this page

Letta. Agent Mart. https://agentmart.dev/infrastructure/letta (last updated 2026-10-24)