# Letta vs T3 Code (slim)

> Letta scores 59.7 (C) to T3 Code's 51.9 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/letta-vs-t3-code.md (~4,850 tokens) · this version ~1,430 tokens · JSON https://www.anchorterminal.com/compare/letta-vs-t3-code.json · canonical https://www.anchorterminal.com/compare/letta-vs-t3-code
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-07
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Letta scores 59.7 (C) on agent readiness against T3 Code's 51.9 (D), and leads in 5 of 7 scored categories. Both do agent harnesses.

- Letta: C 59.7, rank #684 of 1486 · https://www.anchorterminal.com/tools/letta.min.md
- T3 Code: D 51.9, rank #1002 of 1486 · https://www.anchorterminal.com/tools/t3-code.min.md
- Letta, good for Long-lived coding agents and assistants that keep memory and identity across sessions and machines. Ahead on Reliability, 58 against 43; Schema & documentation, 70 against 55; Agent ergonomics, 67 against 60; Maintenance & community, 85 against 75. Also Runs on your own machine.
- T3 Code, good for Developers who want one app, including on their phone, to drive several coding agents they already pay for. Also No key needed to call it.

| Category | Letta | T3 Code |
| --- | --- | --- |
| Reliability (16%) | 58 | 43 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 70 | 55 |
| Agent ergonomics (13%) | 67 | 60 |
| Security & auth (14%) | 35 | 35 |
| Payments & pricing (10%) | 60 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 75 |
| Transparency & trust (7%) | 55 | 51 |

| Fact (where they differ) | Letta | T3 Code |
| --- | --- | --- |
| Vendor | Letta | T3 Tools Inc. |
| Transports | stdio |  |
| Auth | OAuth or key | None |
| Pricing | Freemium | Free |
| Licence | Apache-2.0 | MIT |
| llms.txt | yes | no |
| Terms last updated | no date given | no document linked |
| Privacy policy last updated | no date given | no document linked |
| Customer content may train models | not found in the text | not read yet |
| Terms restrict automated access | not found in the text | not read yet |
| Terms restrict benchmarking | not found in the text | not read yet |
| Terms or service can change without notice | not found in the text | not read yet |
| Arbitration or class-action waiver | yes | not read yet |
| Popularity | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk | none |

Why the edge:
- Reliability, Letta +15: Letta 58 (Local-software lines, read for the harness. `@letta-ai/letta-code` on npm with Node.js 22.19 or newer, and PyPI wheels for glibc Linux, macOS 14 and Windows x64 with Python 3.9 or newer stated (20). ci.yml, nightly update smoke tests and Telegram live smoke tests exist, but GitHub's API answered with a rate limit, so run results were unread (15 of 25, unchecked). 332 open issues and pull requests, mostly pull requests; recent bug reports such as recall reading the wrong conversation have no reply yet (15 of 25). 398 tags at 0.34.x with release notes on GitHub, no changelog file, and breaking removals such as AgentFile announced in the README (8 of 15). Pre-1.0 (0). Total 58.); T3 Code 43 (Local software. An install script and desktop and mobile apps from the vendor (20). ci.yml and windows-tests.yml run on the repository; pass state not read (15). GitHub issues and pull requests weren't read (GitHub's pages refuse these sessions), so that line is scored absent (0). Stable tags v0.1.5 to v0.1.7 with many nightlies, no changelog file (8). Version 0.1.7 (0). 20 + 15 + 0 + 8 + 0 = 43.)
- Schema & documentation, Letta +15: Letta 70 (Harness reading. docs.letta.com serves llms.txt and a Markdown version of every page, with an `applies_to` block saying which backend and interface each page covers (10). TypeScript types for the Agent SDK and a documented App Server WebSocket protocol, but no JSON Schema or OpenAPI for the harness (15 of 25). Pages say when to use local or cloud backends, subagents and channels (14 of 20). Permission modes and options are typed in the SDK (12 of 15). Example applications and a remote client reference (11 of 15). Releases most days but no changelog file (8 of 15). Total 70.); T3 Code 55 (Harness reading. User docs in the repository (managed policy, handoffs, providers, telemetry), AGENTS.md for contributors, a server other clients connect to (55).)
- Maintenance & community, Letta +10: Letta 85 (v0.34.42 on 6 November 2026 (30). Dozens of releases in 90 days (20). Pull requests are merged daily; recent issues from users have few replies (15 of 25). npm and PyPI packages and the Agent SDK track the releases (12 of 15). Lock files, CI and nightly smoke tests (8 of 10). Total 85.); T3 Code 75 (Commits and nightly tags on 6 November 2026 (30). More than three releases in 90 days (20). GitHub issues and pull requests weren't read (GitHub's pages refuse these sessions), so that line is scored absent (0). Current official apps and install script (15). CI on push (10). 30 + 20 + 0 + 15 + 10 = 75.)
- Agent ergonomics, Letta +7: Letta 67 (Harness reading. Toolsets switch with `/model`, skills load per agent, and subagents run in the background (18 of 25). Context is managed through memory blocks, reflection and dreaming (12 of 20). `letta -p --output-format json` for scripted runs and an App Server for programmatic control (12 of 20). Conversations resume by agent and conversation id, and memory is git-tracked so changes can be reverted (15 of 20). Runs with no account on the local backend, with one SDK language, TypeScript (10 of 15). Total 67.); T3 Code 60 (Harness reading. Remote control from phone or browser, portable handoffs between providers and managed policies for teams (60).)