#40 in AI Development PlatformsUpdated 2026-08

Letta

by Letta · Stateful AI agents with persistent memory, via CLI, desktop and web

40.1 — BenchRank score out of 100

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Overview

Letta is a San Francisco AI research lab whose product, Letta Agent, is a stateful agent whose memory, identity and capabilities change with use. It runs through a CLI installed with npm, plus a desktop app, web app and API, and uses either Letta Auto model routing or your own API keys. Agents can be stored locally or self-hosted, and shared across an organisation.

Best for: Individuals and teams running stateful AI agents for coding and chat, via CLI or desktop app
Pricing: Free plan at $0/month with bring-your-own-key models, then Pro at $20/month; developer plans are usage-based and Teams/Enterprise prices are not shown.
Runs on: Self-hostedCLI

Strengths and trade-offs

Strengths

Free plan runs on your own API keys and coding plans
Pro is $20/month and adds remote sandboxes, 20 agents
Agents can be shared across a team with access permissions
Usable as CLI, desktop app, web app and API

Trade-offs

Free plan is capped at 3 stateful agents, Pro at 20
Coding-heavy use is quoted at ~$100-$200+/month in total usage
Docs advise pairing it with a third-party coding plan for heavy use
Teams Pro and Developer plan prices are not published on the page

Pricing

Published plans from Letta’s own pricing page, in USD. Usage charges and add-ons may apply on top.

Letta pricing tiers, monthly rates in USD
Plan	Monthly	Includes
Free	—	Limited to 3 stateful agents Limited usage of Letta Auto Bring your own API keys and external coding plans
Pro	$20	Letta Auto weekly and monthly quota Pay-as-you-go overage via purchased credits Up to 20 stateful agents Run agents in remote sandboxes

How this score is made up

Each dimension is scored out of 100 and combined into the headline score using fixed weights.

MCP support: 0 out of 100
API quality: 10 out of 100
Documentation: 55 out of 100
Agent friendliness: 97 out of 100
Pricing transparency: 100 out of 100
Changelog: 0 out of 100
Marketing site structure: 50 out of 100
Operational trust: 25 out of 100

Measured, but not part of the score

Useful to know, but not a mark for or against the product — so these do not affect the ranking.

Openness: 85 out of 100
Maintenance: 100 out of 100

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