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Letta Agent

AI agent

by Letta

Persistent, personalized AI agent that keeps its memory, skills and identity across sessions, models and machines, learns from experience between sessions, runs on a schedule and answers through Slack, Discord and Telegram, usable from a web app, desktop app, terminal CLI or SDK, locally or in the cloud.

Find alternatives to Letta Agent

What it does

• Agent orchestration

Sources

Pricing

Pricing page · 21 Oct 2026

"You can get started with Letta for free by using models with BYOK" and "Free plans are limited to 3 stateful agents." (Free plan at $0 a month); a paid Pro plan and Teams Pro seats; "Developer plans are usage-based for teams building on the Letta API with API keys and automated workloads."; Enterprise "For high volume enterprises" with "Contact us".

Description

Official documentation · 21 Oct 2026

"Stateful agents for your team that get better as you work with them."; "learning without needing model updates" (sleep-time compute); "Communicate with agents through Slack, Discord, Telegram, or custom channels."; "Ask agents to work proactively, monitor results, or run tasks on a schedule."

What it does

Official documentation · 21 Oct 2026

"Build your own deeply personalized agents, each with their own unique identity and expertise. Supports custom skills, harness modifications, and tools."

Sold within

Pricing page · 21 Oct 2026

Standalone: self-serve signup on a Free plan and a published Pro price on "Pricing for the Letta web app, CLI, and developer usage"; no parent product.

Name

Official documentation · 21 Oct 2026

Page title block "Letta Agent" and the closing line "Create your own agent that remembers and learns."; the Letta docs index (https://docs.letta.com/llms.txt) also calls the open-source CLI harness the Letta Harness, formerly Letta Code.

URL

Official documentation · 21 Oct 2026

Letta's machine-readable index lists the page https://www.letta.com/agent/ under Research and products as "Letta's stateful agent product."; the homepage (https://www.letta.com/) presents Letta Agent as the product its research ships as.

Deployment

Official documentation · 21 Oct 2026

"The web app runs agents in a cloud sandbox with no local setup, while the CLI runs agents on your computer and can use your existing API keys and coding plans."; the Letta docs index (https://docs.letta.com/llms.txt) lists a self-hosted App Server.

Interfaces

Official documentation · 21 Oct 2026

"Use in the browser", "Use in the terminal", "Build with the SDK"; "Communicate with agents through Slack, Discord, Telegram, or custom channels."; the Letta docs (https://docs.letta.com/llms.txt) add a desktop app installed from chat.letta.com.

Modalities

Official documentation · 21 Oct 2026

Web app and CLI quickstart: "Send your first message" and "You're ready to chat!" (typed chat with the agent).

Intended for

Pricing page · 21 Oct 2026

Pricing sections "For Individuals", "For Teams" and "For Developers", plus an Enterprise tier.

Also from Letta

• Letta Agent SDK Developer tool

  Letta Agent SDK lets developers create and resume stateful agents with persistent memory using managed cloud, local, or remote runtimes.

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