Letta Code is a memory-first coding harness, designed for long-lived agents that can learn from experience.
Instead of working in independent sessions, you work with a persisted agent whose memory is portable across models (Claude, GPT, Gemini, GLM, Kimi, and more).
Publisher’s description
What is Letta Code?
Letta Code is an open-source ai assistants & llm program for Windows from Letta. It is written in TypeScript.
Installation and requirements
Official installers exist for 64-bit as EXE (NSIS). The main installer is 180.0 MB. It can be installed for the current user only, without administrator rights. The installer supports unattended (silent) installation.
Updates and version history
The current version is 0.34.11, released on October 12, 2026. 33 versions are listed since May 2, 2026, each with links to its own installer files. The last update is less than a month old.
Popularity and file types
The source code on GitHub (letta-ai/letta-code) has 3,681 stars. Similar programs include Claude Code, Codex CLI and ChatGPT.
Project description on GitHub: “Stateful agents that are like people, with memory, identity, and the ability to learn and adapt”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Documented silent install
- Installs without administrator rights
- Updated in the last two months
Cons
- No native ARM64 build
In short: Letta Code is an open-source ai assistants & llm tool for 64-bit PCs. Administrators can deploy it unattended.
Is Letta Code safe to download?
- The file is served by download.letta.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
A6DF5D7363902CC16FC877E61A254D7C7043BEEAC301692BB55731682FEA09A5· Open the VirusTotal report for this hash - The link answered when we last checked it (October 22, 2026)
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 33 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 0.34.11Latest | October 12, 2026 | 180.0 MB | 64-bit EXE (NSIS) |
| 0.34.8 | October 9, 2026 | — | 64-bit EXE (NSIS) |
| 0.33.6 | September 30, 2026 | — | 64-bit EXE (NSIS) |
| 0.32.19 | September 24, 2026 | — | 64-bit EXE (NSIS) |
| 0.32.17 | September 23, 2026 | — | 64-bit EXE (NSIS) |
| 0.32.13 | September 18, 2026 | — | 64-bit EXE (NSIS) |
| 0.32.11 | September 16, 2026 | — | 64-bit EXE (NSIS) |
| 0.32.10 | September 15, 2026 | — | 64-bit EXE (NSIS) |
Install from the command line
Silent install ›winget install --id Letta.LettaCode -ex64 /SRelated guide: How to use winget: install and update apps
Information
- Publisher
- Letta
- Category
- AI assistants & LLMs
- Licence
- Apache-2.0
- Price
- Free
- Source code
- github.com/letta-ai/letta-code
- Written in
- TypeScript
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- EXE (NSIS)
- Version
- 0.34.11
- Released
- October 12, 2026
- Added to the catalogue
- May 11, 2026
- Versions listed
- 33
- GitHub stars
- 3,681
- GitHub forks
- 443
- Website
- letta.com
- winget ID
- Letta.LettaCode
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to Letta Code
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Frequently asked questions
Is Letta Code free?
Yes. Letta Code is open-source software under the Apache-2.0 licence.
Is Letta Code safe to download?
The download comes from download.letta.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Letta Code with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can Letta Code be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does Letta Code run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of Letta Code?
The versions page lists all 33 versions with links to their official installer files, back to May 2, 2026.
Can I use Letta Code without administrator rights?
Yes, there is a per-user installer that does not need administrator rights.
What are alternatives to Letta Code?
Claude Code, Codex CLI, ChatGPT, oh-my-pi and GPT4All. The alternatives page compares them.
