Letta

Letta

Open Source(Apache-2.0)
Verified
AI-Native

Machines that learn — self-improving AI agents (from the creators of MemGPT)

GDPR
Public status page
Works offline
Global
Self-hostable
+5
Last updated: Nov 3, 2026
Open Source
Visit Site25.1k
More
letta.com
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Quick Answer

AI

Letta is a platform for building and deploying self-improving AI agents. It supports stateful agents with memory, identity, and evolving capabilities, integrating with Slack, Discord, and Microsoft Teams. Best for developers building automated workloads and teams creating custom agents. Freemium with Pro plans starting at $20/month.

About LettaAI

Letta is an AI research lab building self-improving AI agents that learn continuously and evolve with experience. It provides a platform for stateful agents with memory, identity, and capabilities that improve over time. Free to get started with BYOK models; Pro plan from $20/month.

What Makes It UniqueAI

Letta agents learn by actively managing their own context, creating durable token-space representations of identity, memory, and continuity, rather than by updating model weights. They can also self-modify the harness itself through mods.

AI-extracted from public sources. May contain errors. Methodology · Report an error

Decision Intelligence

Best For

AI
Developers building AI agents for automated workloads
Teams creating custom agents with shared resources and permissions
Individuals using stateful agents for personal use
Enterprises requiring high-volume agent deployments with custom pricing
Pricing Overview

Type

Open Source

Free Trial

No

Credit Card

Not Required

Free Plan

Yes

Dimension Scores

· 5.8 avg

How good it is, across universal quality axes

Ease of Use1/10
Customization9/10
Support10/10
Integration7/10
Compliance & Data Protection3/10
Performance5/10
AI-scored from up to 37 public sources, reviewed by a person·High confidenceHow we score

Task Scores

· 7.0 avg

What it can do, per category it works in · showing 10 of 10 tasks scoring 5+

State Management9/10
Role Definition8/10
Task Decomposition8/10
Scalability Throughput8/10
Agent Coordination7/10
Workflow Orchestration7/10
Tool Use Delegation7/10
Inter Agent Communication6/10
Error Recovery5/10
Observability5/10

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Capabilities
Chat
Code
Memory
File Upload
Data Analysis
Automation
Agent
RAG
Categories
Automation Agents
Multi Agent Systems
Code Assistant
LimitationsAI
  • -Free plan is limited to 3 stateful agents
  • -Personal Plans require OAuth authentication
  • -Developer Plans use API key authentication
  • -Tool execution on the API Plan is usage-based
  • -Letta Auto usage is quota-limited on Pro plans
  • -Data collection for hosted services may be used for model training
Fit Score

Complexity

Advanced

Company Size

Solo
Small
Medium
Enterprise

Target Team Size

Individual
Small Team
Large Team

Target Skill Level

Expert
Technical Specifications
SDK Available
MCP Compatible
Team Features
Webhook Support (unknown)
Has Demo
Function Calling
Sandbox Mode
Audit Logs
No Signup
Works Offline
Requires Host App
Framework
MCP Server
Inference API
MCP transport:
Streamable HTTP
Authentication
Single Sign-On
SAML
OAuth
Developer Access
SDK
@letta-ai/letta-client
TypeScript
Python
→ Package
Sandbox
Login required
→ Try sandbox
Deployment:
Self Hosted
Compliance, Privacy & Trust
GDPR: Stated by vendor
SOC 2: No info available
HIPAA: No info available
Privacy & data handling
Trains on user data: Yes
Data deletion: Upon Request
Copyright policy: User Owns Output
Human review:
Recommended

The Model(s) Behind It

Model details — extracted from public vendor sources by our pipeline (AI extraction plus a source check) or admin-entered. Shown as claimed by the vendor; not independently audited by Intelloro.

Uses Models
Bring your own model — use your own API key or endpoint
Training Data Provenance
Not disclosed
Relevant to EU AI Act Art. 53 / Annex XI (GPAI)
Integrations & Connections
6 connections
GI
GitHubNative

Access to GitHub repositories for cloud agents

SL
SlackNative

Bring Letta agents to Slack with native integration

TE
TelegramAPI

Run agents as Telegram bots

WH
WhatsAppAPI

Run agents on WhatsApp

SI
SignalAPI

Run agents on Signal

DI
DiscordAPI

Run agents as Discord bots

Auto-updated

Trust Score

98/100

Excellent

Based on 10 data signals

Confidence: High

Reflects publicly available data, not an independent audit

Compliance & Verified38/38
VerifiedYes
GDPRYes
Open-source licenseApache-2.0
Human ReviewYes
Operational25/25
Status PageYes
Reliability8/10
Uptime (measured)99.96% (365-day)
Market Proof10/10
Notable CustomersBilt, 11x, Kognitos
Company17/17
Company ListedYes
Team Size11-50
FundingSeed
Health—

Not yet checked

AI-Assisted Data

Some details are AI-generated estimates — verify with the vendor.

AI-generated estimate: Best For, Description, Limitations, Quick Answer, What Makes Unique

How we source data

AI Governance & Regulatory Disclosures

Legally-sensitive fields — extracted from public vendor sources by our pipeline (AI extraction plus a source check) or admin-entered. Shown as claimed by the vendor; not independently audited by Intelloro.

EU AI Act Risk Tier
Unclassified

Switching & Migration

Migration Difficulty
Significant Effort
Support:
Email
Discord
Enterprise
API Access
Open Source
Quick Stats
CategoryAI Agent Builders
PlatformsWeb, API, CLI
Integrations6
Launched2024
VerifiedNov 2026
Company & Links
CompanyLetta
FormerlyMemGPT
Founded2024
Based inUnited States
FundingSeed · $10M
DocumentationChangelog
LinkedInTwitter/XDiscordYouTube
All Features
Self-improving AI agents
Git-versioned memory filesystem (MemFS)
Multi-conversation memory
Skills and schedules for agents
Sleep-time subagents for reflection
System prompt learning and self-modification (mods)
CLI and desktop app for agent interaction
Cloud-hosted agents with GitHub and Slack integration
Pricing Plans
Free
Free
  • Limited agents
  • Limited usage of Letta Auto
  • Bring your own API keys and external coding plans
    • Pro
    $20/month
  • Letta Auto weekly + monthly quota
  • Pay-as-you-go overage
  • Up to 20 stateful agents
    • API Plan
    $20/month
  • Unlimited agents
  • $0.10 / active agent / mo
  • $0.00015 / sec tool execution
  • API key authentication
  • Pay-as-you-go LLM usage
    • Teams Pro
    $20/user
  • Add teammates to your organization
  • Letta Auto weekly + monthly quota
  • Share agents and set access control
    • Enterprise
    Custom
  • Volume-based pricing
  • Increased quotas
  • Role-based access control
  • SAML/OIDC SSO
  • Dedicated support

    • Pricing verified from the vendor pricing page.

    User Reviews

    No reviews yet. Be the first to review!

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    Who It's For
    4 roles
    Software DevelopersComputer ProgrammersWeb Developers+1 more
    Platform, Content & Languages
    3 content types
    1 languages
    CodeTextSocial MediaEnglish+5 more

    Content Types

    Code
    Text
    Social Media

    Publishes to

    Discord

    Accepts

    Text
    Code
    API

    Produces

    Text
    Code
    Languages: English

    Frequently Asked Questions

    What can Letta do?

    Letta can: Self-improving AI agents, Git-versioned memory filesystem (MemFS), Multi-conversation memory, Skills and schedules for agents. Best for: Developers building AI agents for automated workloads.

    How much does Letta cost?

    Letta is open source and free to self-host. Cloud hosting options may have separate pricing.

    Is Letta free?

    Yes, Letta is open source and free to self-host. Managed hosting may carry separate costs.

    What makes Letta unique?

    Letta agents learn by actively managing their own context, creating durable token-space representations of identity, memory, and continuity, rather than by updating model weights. They can also self-modify the harness itself through mods.

    Does Letta have an API?

    Yes, Letta offers a public API for developers to integrate its capabilities into custom applications and workflows.

    What platforms does Letta support?

    Letta is available on web, API, and CLI.

    What languages does Letta support?

    Letta supports English.

    Does Letta work offline?

    Yes, Letta supports offline use — you can run it without an active internet connection.

    Who is Letta for?

    Letta is designed for Developers building AI agents for automated workloads; Teams creating custom agents with shared resources and permissions; Individuals using stateful agents for personal use.