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Harness · Published way in

Letta Agent

A persistent agent platform maintains context and learns across interactions.

  • Made by Letta
  • Available
  • Reached through Desktop app (macOS, Windows, Linux), Web, CLI, Slack, Discord, Telegram
  • Official site
Bring it into NetShow

What Letta Agent is good for

Best at

Long-lived agents that keep learning across sessions, models and channels.

Suggested router expertise, based on product positioning:

  • Routines
  • App integrations
  • Memory

It is positioned for:

  • Memory

Verified facts

Checked against public maker pages. Missing disclosures and unverified details are marked below; a product claim is not an independent performance test.

What it is
Letta Agent: stateful agents for your team that remember, keep learning and run locally or in the cloud. Official source · checked 1 October 2026. Source 1
Maker
Letta, an AI lab born from MemGPT at UC Berkeley's Sky Computing Lab. Official source · checked 1 October 2026. Source 1
Source and licence
Not stated on the product page, which links Letta's GitHub. Not fully disclosed · checked 1 October 2026. Source 1
Models
Bring your own model and subscription plans (OpenAI Codex, Z.AI and others) or your own API keys; agents move between models without losing memory. Official source · checked 1 October 2026. Source 1
Tools and MCP
Custom skills and tools, MCP and client tools, scheduled tasks, and an Agent SDK with an API to create agents and send messages. Official source · checked 1 October 2026. Source 1 Source 2
Memory
Sleep-time compute and git-tracked context (MemFS); the SDK adds memory blocks, shared memory and archival memory. Official source · checked 1 October 2026. Source 1 Source 2
Deployment
Desktop app (macOS, Windows, Linux), the Letta Code CLI, or Letta's cloud; agents can also work on remote devices you connect. Official source · checked 1 October 2026. Source 1
Pricing model
Free with your own API keys or coding plans; Assistant Benchmark reports a Pro plan at $20 a month. Source record · checked 1 October 2026. Source 1 Source 2
Product status
Active. Official source · checked 1 October 2026. Source 1

How it scores

Assistant Benchmark lists Letta Agent, but had not published a dated test run for it when NetShow checked on 30 September 2026. NetShow shows no score until one exists. See its listing.

How it works inside a NetShow alive agent

Published way in Its maker publishes a way for software to talk to it (an API, an MCP server, an SDK or a command line), so a connector can be built on that surface and reviewed before an owner pairs it.

Published way in: SDK.

Bring it into NetShow

Generic connector over your own Letta agent: its Agent SDK and API, or an MCP server you run.

  1. Run your own Letta agent locally or in your own Letta cloud account, with your own model keys.
  2. Expose that agent through an endpoint you control, built on Letta's Agent SDK and API: an MCP server, an OpenAI-compatible HTTP endpoint or an A2A agent card.
  3. Bring your own endpoint and your own key through NetShow's existing bring-your-own harness flow; the key goes to the encrypted owner store, never to this page.
  4. Declare its expertise tags, give it limited permissions and a daily ceiling, and run one harmless test turn before Auto routing.

Read how the harness router works or compare every harness.

Honest comparison

These compare published product focus and integration paths, without claiming an unmeasured winner.

Hermes Agent

Hermes Agent is MIT-licensed and self-hosted with a messaging gateway; Letta Agent adds a cloud option and an Agent SDK for developers.

Checked 1 October 2026. Source 1 Source 2

Kith Rabbit

Kith Rabbit is a consumer app that remembers your network; Letta is a platform for building your own learning agents.

Checked 1 October 2026. Source 1 Source 2

Price and access

Free with your own API keys (3 agents) · Pro $20/mo. (as reported by Assistant Benchmark, checked 9 September 2026)

Any cost of the harness itself is between you and its maker. NetShow never pays for or signs up to it on your behalf.

Questions people ask about Letta Agent

What is Letta Agent?
Letta Agent: stateful agents for your team that remember, keep learning and run locally or in the cloud.
What is Letta Agent best at?
Long-lived agents that keep learning across sessions, models and channels. This is product positioning, not a measured result.
Is Letta Agent open source?
Not stated on the product page, which links Letta's GitHub.
Is Letta Agent free?
Free with your own API keys or coding plans; Assistant Benchmark reports a Pro plan at $20 a month.
Can I bring Letta Agent into NetShow?
Generic connector over your own Letta agent: its Agent SDK and API, or an MCP server you run. Nothing connects by visiting this page.

Give your agent Letta Agent's kind of expertise

Pair the harnesses you choose behind one alive agent; the router hands each one the jobs it is good at.

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