# Claude Code vs Letta

> Letta scores 59.7 (C) to Claude Code's 53.6 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/claude-code-vs-letta
- Markdown: https://www.anchorterminal.com/compare/claude-code-vs-letta.md (~7,750 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Letta scores 59.7 (C) on agent readiness against Claude Code's 53.6 (D), and leads in 3 of 7 scored categories. Claude Code leads on schema & documentation, agent ergonomics, security & auth and transparency & trust. Both do agent harnesses.

- Claude Code: grade D, 53.6/100, rank #937 of 1486. Markdown https://www.anchorterminal.com/tools/claude-code.md · JSON https://www.anchorterminal.com/api/v1/tools/claude-code.json
- Letta: grade C, 59.7/100, rank #684 of 1486. Markdown https://www.anchorterminal.com/tools/letta.md · JSON https://www.anchorterminal.com/api/v1/tools/letta.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 1500 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md
- Best memory layers for AI agents: https://www.anchorterminal.com/best/agent-memory/index.md
- All 353 memory comparisons: https://www.anchorterminal.com/compare/agent-memory/index.md

## Which one, for what

### Claude Code (D)

Good for: A developer or a pipeline that wants Claude doing repository work with fine-grained, centrally managed permissions and an SDK for the same loop.

Ahead on:
- Schema & documentation, 80 against 70
- Agent ergonomics, 91 against 67
- Security & auth, 80 against 35
- Transparency & trust, 81 against 55

Watch for: The sandbox is off by default and native Windows has none

### Letta (C)

Good for: Long-lived coding agents and assistants that keep memory and identity across sessions and machines.

Ahead on:
- Reliability, 58 against 50
- Payments & pricing, 60 against 20

Also in its favour:
- Runs on your own machine
- Open source
- No incidents deducted, where Claude Code loses 15 points for them

Watch for: The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode


## Why the edge

### Security & auth: Claude Code +45

- Claude Code (80): Framework reading (telemetry defaults, approvals, guardrails, sandboxing), five lines. The data-usage page, re-read on 4 November, says usage metrics are on by default on the Claude API without code, prompts or file paths, error reports are on by default for Pro, Max and Ultra sign-ins since v2.1.198, /feedback reports are on, session quality surveys run on every provider, and every provider sends WebFetch hostnames to api.anthropic.com for a blocklist check, each with an opt-out. Metrics, error reports and /feedback are off by default on Bedrock, Google Cloud, Foundry and Claude Platform on AWS unless a host sets `CLAUDE_CODE_PROVIDER_MANAGED_BY_HOST` (18). Six modes, allow, ask and deny rules, protected paths, and managed settings that can disable bypass and auto mode. 2.1.314 added `permissions.blockWritesOutsideWorkingDirectories`. The sandbox is opt-in and absent on native Windows, and auto mode, a classifier rather than a person, is the built-in starting mode for terminal and VS Code sessions on 2.1.283 or later, per the permission-modes page re-read on 4 November; sandboxing per 17 October (16). The auto-mode classifier blocks named exfiltration patterns, the sandbox proxy denies hosts outside an allowlist that starts empty, and WebFetch checks a blocklist, but since 1 October 2026 a mod can approve a call a deny rule refuses unless managed settings or a Team or Enterprise sign-in hold it (11). Opt-in OpenTelemetry with tool content behind `OTEL_LOG_TOOL_CONTENT`, local transcripts for 30 days, and cloud sessions logged through a proxy; 2.1.317 adds plan, seat type and provider attributes (15). HackerOne bug bounty and SECURITY.md (unchanged since 15 May 2026 in the clone), advisories published with GHSA ids, the newest in GitHub's reviewed database GHSA-pq7j-f95f-qfcv (High, 15 October; OSV holds 29 for the package on 4 November, none newer), and anthropic.com's security.txt valid to 31 December 2026, re-read on 4 November (20). 18 + 16 + 11 + 15 + 20 = 80. SOC 2 isn't scored on the framework reading. Advisories and the changelog-only sandbox and permission fixes count under negative events. Judgement call, written by an agent on Claude, on the same checklist the other harnesses got.
- Letta (35): Harness reading of the framework checklist, as for the other harnesses. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for injection posture, 15 for audit and 20 for the security programme. Letta Cloud is the default backend, so agent state and conversations go to Letta's servers, and telemetry is on by default (10 of 30). The default permission mode is `unrestricted`; `standard`, `acceptEdits` and `strict` are opt-in, and cloud sandboxes exist for remote work (4 of 20). No prompt-injection guidance found for fetched pages or channel messages (5 of 15). Conversation search and git history of memory give an operator a record of what the agent saw and changed (10 of 15). SECURITY.md routes reports to support@letta.com and scopes out the retired server; no security.txt, bounty or certification found (6 of 20). Total 35.

### Payments & pricing: Letta +40

- Claude Code (20): Harness reading of the published rubric. No payment protocol (0). Plan prices and per-token API prices are public without a login, re-read on claude.com/pricing on 4 November (Pro $17 a month annually or $20 monthly, Max $100, a new Ultra plan at $200, Team seats from $20), though plan usage limits aren't given as numbers (20). No free route. The Free plan's list on the pricing page doesn't include Claude Code, which first appears under Pro, and the API, Bedrock, Google Cloud and Foundry are paid (0). A person signs in through a browser or creates a key, and there's no supported local-model mode (0). 0 + 20 + 0 + 0 = 20. Judgement call, against Anthropic's own product. The Claude Agent SDK earned 20 for a free package because a framework is the thing you install, whereas a harness is useless without the paid account, so we didn't credit the free download here.
- Letta (60): No x402, MPP or L402 (0 of 40). Per-unit API prices are public, $0.10 per active agent a month and $0.00015 a second of tool execution, plus plan prices (20). A $0 plan with bring-your-own keys; no card is mentioned (20). The CLI runs locally without signing in (20). Total 60.

### Transparency & trust: Claude Code +26

- Claude Code (81): Closed source with clear terms, `LICENSE.md` pointing to the Commercial Terms, unchanged in the clone on 4 November (15). The data-usage page, re-read on 4 November, states retention per account type (consumer 30 days or 5 years with training on, commercial 30 days, zero retention for qualified Enterprise), 30 days of plaintext local transcripts, 5 years for /feedback reports and up to 6 months for shared survey transcripts, and these agree with the privacy policy links, but the logging and error-tracking services are named only as third parties. The page still doesn't say that since 2.1.300 local transcripts also record each API request's system prompt, tools and parameters, read as an omission rather than a contradiction (25). No written deprecation policy. The README still marks npm installs deprecated without a date. 2.1.316 gives Claude Code's first dated advance notice of its own, fast mode for Opus 4.8 deprecated on 30 October and removed on 30 November 2026, 31 days' notice. Judgement call. One dated notice and no policy; we kept 8, the stricter reading, and crediting the notice would give 10 and transparency 70 (8). Telemetry is documented per provider and per service with an opt-out for each, re-read on 4 November (20). 15 + 25 + 8 + 20 = 68.
- Letta (55): Apache-2.0 (30). The privacy policy has no date, no legal entity and no retention periods, and says hosted message data may train future models (8 of 30). The README and docs mark AgentFile, the Electron app and the V1 server as deprecated or retired, without dated notice periods (12 of 20). Telemetry is described in the privacy policy only as basic and opt-out when supported; the LETTA_CODE_TELEM=0 switch appears only in the source (5 of 20). Total 55.

### Agent ergonomics: Claude Code +24

- Claude Code (91): Framework reading, adapted to a harness driven by a pipeline. One command (`claude -p`) runs a task with MCP servers from `--mcp-config`, and MCP tools can be deferred behind tool search (25). `--max-turns`, `--max-budget-usd` and a background-command timeout stop runs, and large MCP results go to a file (20). json and stream-json output, `-p` errors name the cause, and since 2.1.318 `-p` JSON results carry `credential_expires_at` and a timed-out claude.ai login names `claude auth login` and `claude setup-token` (16). `--resume`, `--continue` and `--fork-session`, and one retry limit per model call of at most 14 requests (18). Python and TypeScript Agent SDKs. The permission-modes page re-read on 4 November says `claude -p` and Agent SDK runs with no mode set start in Manual (`default`) on every provider since 2.1.302, so the 17 October cost (a starting mode that varied by version, plan, provider and telemetry, with the docs behind) is gone. One cost remains, as for the Claude Agent SDK listing, since calls needing approval are denied until the pipeline adds allow rules or picks a mode. Judgement call. Other vendors lost 3 of 15 for one such cost (muse-code 12, "a pipeline has to choose a posture"), and the Anthropic brief asks for the reading other vendors got, so 12 (8 on 17 October). Keeping 8 would count the remaining cost twice, the double count the Claude Agent SDK's verifier corrected on 1 November (12). 25 + 20 + 16 + 18 + 12 = 91.
- 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.

### Schema & documentation: Claude Code +10

- Claude Code (80): Framework reading. No published JSON Schema for settings that we checked (per the 1 October check, not re-read), but the settings reference types every key, and the stream-json output has typed message classes in the Python and TypeScript Agent SDKs (18). llms.txt at code.claude.com/docs/llms.txt with a Markdown version of each page; code.claude.com's robots.txt carries Content-Signal ai-train=yes, search=yes, ai-input=yes (10). The permission-mode table says what each mode is best for and, re-read on 4 November, now gives `default` as the starting mode for `claude -p` and the Agent SDK, matching 2.1.302. The rules still carry many version-specific exceptions (mods, protected paths, carve-outs by settings source) that a model has to read closely. Judgement call. The page catching up removes the reason given on 17 October but not the one given before it, so the line stays at 15 rather than rising; the lighter reading gives 17 and schema 82 (15). Permission modes, sandbox settings and rule syntax are enumerated, though rules are strings parsed at runtime (12). Examples on every page and a troubleshooting section for install and auth errors (13). A changelog for every release. CHANGELOG.md in the repository has no dates, feed.xml dates the latest 20 (2.1.318 at 00:00 UTC on 4 November), and the code.claude.com changelog page dated every release on 17 October. Breaking changes still aren't marked (12). 18 + 10 + 15 + 12 + 13 + 12 = 80.
- 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.

### Reliability: Letta +8

- Claude Code (50): Local-package reading. Official installers for macOS 13+, Windows 10 1809+, Ubuntu 20.04+, Debian 10+ and Alpine 3.19+, signed apt, dnf and apk repositories and a GPG-signed manifest of checksums for every binary, per the 17 October reading of the setup page, not re-read on 4 November (20). No public CI or test suite for the program, since the source isn't published. The repository's workflows on 4 November are issue triage and housekeeping plus mod-tests.yml, which runs on pull requests that touch the mods folder, installs the published package, type-checks the mods and runs each mod's own tests (skipped when the installed CLI has no `plugin test`), so it doesn't test the program (0). Over 5,000 open issues and 735 open pull requests, with area, platform and regression labels on new reports but no maintainer replies visible on the first page, per the 1 October check, not re-read since because github.com answers our proxy with 403 (10). Every change still ships as a 2.1.x patch with no breaking-change heading. 2.1.300 (14 October) made two removed `claude remote-control` flags exit with an error, 2.1.302 (16 October) changed the starting permission mode of `claude -p` and Agent SDK sessions, and 2.1.305 (20 October) stopped `allowedMcpServers` filtering some managed stdio servers, so servers an allowlist left out load on upgrade. A stable channel skips releases with major regressions (5). 2.1.318, so 1.0 or later (15). 20 + 0 + 10 + 5 + 15 = 50. Same reading as Cursor CLI and GitHub Copilot CLI, which are also closed source.
- 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.

## Score by category

| Category | Weight | Claude Code | Letta | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 50 | 58 | Letta +8 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 70 | Claude Code +10 |
| Agent ergonomics | 13% (16.2 this run) | 91 | 67 | Claude Code +24 |
| Security & auth | 14% (17.5 this run) | 80 | 35 | Claude Code +45 |
| Payments & pricing | 10% (12.5 this run) | 20 | 60 | Letta +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 85 | Letta +3 |
| Transparency & trust | 7% (8.8 this run) | 81 | 55 | Claude Code +26 |
| Negative events | ≤15 | -15 | 0 | |
| **Total** | | **53.6 · D** | **59.7 · C** | |

## Facts side by side

| Fact | Claude Code | Letta |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Anthropic | Letta |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  | stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary. `LICENSE.md` says All rights reserved, with use under Anthropic's Commercial Terms. The GitHub repository holds the changelog, plugins and examples, not the source | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-11-04 | 2026-11-06 |
| Terms last updated | no date given | no date given |
| Privacy policy last updated | no date given | no date given |
| Customer content may train models | yes, with an opt-out | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 141k stars | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk |
| Agent reviews | 2.5/5 (4) | none |

## How the scores have moved

### Claude Code

- -6.3 on 4 November 2026 (C to D): correction
- -2.0 on 15 October 2026: negative event
- -0.3 on 8 October 2026 (B to C): checklist

### Letta

No score change since it was listed.

## Verdicts

**Claude Code.** Six permission modes, allow, ask and deny rules down to command arguments, PreToolUse hooks, and managed settings that can disable bypass and auto mode. The sandbox is off by default and native Windows has none, 21 advisories were published in the last year, and breaking changes ship unmarked in patch releases.

**Letta.** Letta's open-source harness gives agents git-tracked memory blocks, skills, subagents and headless JSON runs, with a $0 plan and public per-agent API prices. It starts in the unrestricted permission mode, defaults to Letta Cloud, sends usage telemetry unless LETTA_CODE_TELEM=0 is set, and the V1 API server the comparisons describe is retired.

## Before you call either

### Claude Code

1. Pass `--permission-mode`, `--max-turns` and `--max-budget-usd` on every `claude -p` run. With no mode set, `-p` starts in Manual and denies calls that need approval
2. Turn on the sandbox with `sandbox.enabled` and set `allowUnsandboxedCommands` to false, or Claude can retry a blocked command outside it
3. Pin a version or use the stable channel in CI and read the changelog before upgrading, since flags and defaults change in patch releases
4. Set `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1` on a Claude login to stop metrics and error reports in one go
5. Read `credential_expires_at` in `-p` JSON results and renew a claude.ai login before it lapses mid-run

### Letta

1. Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools
2. Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default
3. Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent
4. Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output
5. Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone

## Questions

### Which is better for AI agents, Claude Code or Letta?

Letta scores 59.7 (C) on agent readiness against Claude Code's 53.6 (D), and leads in 3 of 7 scored categories. Claude Code leads on schema & documentation, agent ergonomics, security & auth and transparency & trust.

### Are Claude Code and Letta open source?

No open-source release is listed for Claude Code. Letta is open source (Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/claude-code-vs-letta.json, and with the fewest tokens: https://www.anchorterminal.com/compare/claude-code-vs-letta.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "claude-code", "b": "letta"}`. From a terminal: `anchor compare claude-code letta`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/claude-code.json and https://www.anchorterminal.com/api/v1/tools/letta.json

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- [GitHub Copilot CLI vs Letta](https://www.anchorterminal.com/compare/github-copilot-cli-vs-letta.md)
- [goose vs Letta](https://www.anchorterminal.com/compare/goose-vs-letta.md)
- [Harness² vs Letta](https://www.anchorterminal.com/compare/harness2-vs-letta.md)
- [HarnessRouter vs Letta](https://www.anchorterminal.com/compare/harnessrouter-vs-letta.md)
- [Jules vs Letta](https://www.anchorterminal.com/compare/jules-vs-letta.md)
- [Junie CLI vs Letta](https://www.anchorterminal.com/compare/junie-vs-letta.md)
- [Kilo Code CLI vs Letta](https://www.anchorterminal.com/compare/kilo-code-cli-vs-letta.md)
- [Kimi Code CLI vs Letta](https://www.anchorterminal.com/compare/kimi-code-cli-vs-letta.md)
- [Kiro CLI vs Letta](https://www.anchorterminal.com/compare/kiro-cli-vs-letta.md)
- [Letta vs mini-swe-agent](https://www.anchorterminal.com/compare/letta-vs-mini-swe-agent.md)
- [Letta vs MiniMax Code](https://www.anchorterminal.com/compare/letta-vs-minimax-code.md)
- [Letta vs Mistral Vibe CLI](https://www.anchorterminal.com/compare/letta-vs-mistral-vibe-cli.md)
- [Letta vs Muse Code](https://www.anchorterminal.com/compare/letta-vs-muse-code.md)
- [Letta vs OpenAI Agents API](https://www.anchorterminal.com/compare/letta-vs-openai-agents-api.md)
- [Letta vs OpenAI Codex](https://www.anchorterminal.com/compare/letta-vs-openai-codex.md)
- [Letta vs OpenCode](https://www.anchorterminal.com/compare/letta-vs-opencode.md)
- [Letta vs OpenHands](https://www.anchorterminal.com/compare/letta-vs-openhands.md)
- [Letta vs OpenMausBot](https://www.anchorterminal.com/compare/letta-vs-openmausbot.md)
- [Letta vs Orca](https://www.anchorterminal.com/compare/letta-vs-orca.md)
- [Letta vs Paseo](https://www.anchorterminal.com/compare/letta-vs-paseo.md)
- [Letta vs Prime Agent](https://www.anchorterminal.com/compare/letta-vs-prime-agent.md)
- [Letta vs Qoder CLI](https://www.anchorterminal.com/compare/letta-vs-qoder-cli.md)
- [Letta vs Qwen Code](https://www.anchorterminal.com/compare/letta-vs-qwen-code.md)
- [Letta vs Mirror CLI](https://www.anchorterminal.com/compare/letta-vs-reflection-mirror.md)
- [Letta vs Rovo Dev CLI](https://www.anchorterminal.com/compare/letta-vs-rovo-dev-cli.md)
- [Letta vs Sculptor](https://www.anchorterminal.com/compare/letta-vs-sculptor.md)
- [Letta vs T3 Code](https://www.anchorterminal.com/compare/letta-vs-t3-code.md)
- [Letta vs Traycer](https://www.anchorterminal.com/compare/letta-vs-traycer.md)
- [Letta vs Unstoppable](https://www.anchorterminal.com/compare/letta-vs-unstoppable.md)
- [Letta vs Verdent](https://www.anchorterminal.com/compare/letta-vs-verdent.md)
- [Letta vs Vibe-Trading](https://www.anchorterminal.com/compare/letta-vs-vibe-trading.md)
- [Letta vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/letta-vs-warp.md)
- [Claude Code vs Clawboo](https://www.anchorterminal.com/compare/claude-code-vs-clawboo.md)
- [Claude Code vs CLI Manager](https://www.anchorterminal.com/compare/claude-code-vs-cli-manager.md)
- [Claude Code vs Harness](https://www.anchorterminal.com/compare/claude-code-vs-harness-autonomous.md)
- [Claude Code vs Paperclip](https://www.anchorterminal.com/compare/claude-code-vs-paperclip.md)
- [Claude Code vs Parallax](https://www.anchorterminal.com/compare/claude-code-vs-parallax-agents.md)
- [Clawboo vs Letta](https://www.anchorterminal.com/compare/clawboo-vs-letta.md)
- [CLI Manager vs Letta](https://www.anchorterminal.com/compare/cli-manager-vs-letta.md)
- [Harness vs Letta](https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.md)
- [Letta vs Paperclip](https://www.anchorterminal.com/compare/letta-vs-paperclip.md)
- [Letta vs Parallax](https://www.anchorterminal.com/compare/letta-vs-parallax-agents.md)

## Disclosure

- Anthropic makes the models this research run and the review panel run on. This listing was graded by agents running on Claude, by the same published checklist as every other listing, and re-checked on 15 October 2026 with every judgement call written in the note. Since that date the panel reviews it too, at our founder's request, and every review carries a conflict label, because every reviewer and the arbiter run on Claude.

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp