# Cline vs Letta

> Letta scores 59.7 (C) to Cline's 52.8 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/cline-vs-letta
- Markdown: https://www.anchorterminal.com/compare/cline-vs-letta.md (~5,950 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 Cline's 52.8 (D), and leads in 1 of 7 scored categories. Cline leads on reliability, schema & documentation, security & auth and transparency & trust. Both do agent harnesses.

- Cline: grade D, 52.8/100, rank #975 of 1510. Markdown https://www.anchorterminal.com/tools/cline.md · JSON https://www.anchorterminal.com/api/v1/tools/cline.json
- Letta: grade C, 59.7/100, rank #687 of 1510. 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

### Cline (D)

Good for: Developers who want an agent inside VS Code or JetBrains that asks before acting and can roll back, with the same engine in a CLI.

Ahead on:
- Reliability, 70 against 58
- Schema & documentation, 77 against 70
- Security & auth, 57 against 35
- Transparency & trust, 65 against 55

Also in its favour:
- Free to start without a card

Watch for: The CLI approves every tool by default outside ACP mode and starts on Cline's own provider

### Letta (C)

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

Ahead on:
- Payments & pricing, 60 against 50

Also in its favour:
- Runs on your own machine
- No incidents deducted, where Cline loses 14 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: Cline +22

- Cline (57): Harness reading of the framework checklist, used for all five harnesses in the 1 October batch. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for prompt-injection posture, 15 for audit and 20 for the security programme. Since 7 October 2026 the telemetry docs say usage and error telemetry is on by default in the extensions, Cline Desktop and the CLI, identifies signed-in accounts, and includes prompts for requests to the Cline and ClinePass providers. Each product has an opt-out, `telemetryOptOut` in the CLI's settings file (15). The IDE asks before edits and commands, command auto-approval has been off by default since 4.0.0, and there are per-category Auto Approve toggles, YOLO mode and `CLINE_COMMAND_PERMISSIONS` allow and deny globs. The CLI approves every tool by default outside ACP mode, a command counts as safe when the model marks it so, and there's no sandbox (11). No prompt-injection guidance found in the docs (4). Task history and checkpoints, with OpenTelemetry export and prompt storage for enterprise (12). A valid security.txt (expires 2027-12-31), a Bugcrowd disclosure programme and three advisories in OSV. GHSA-3cj3-hqcr-g934 now lists 3.0.30 as patched, and GHSA-5c57-rqjx-35g2 lists 2.13.0 as the last affected version (15).
- 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.

### Reliability: Cline +12

- Cline (70): Read as a local package. The `cline` CLI on npm (Node 22 or later), the VS Code extension (VS Code 1.101 or later), a JetBrains plugin and desktop builds (20). The 1 October check saw the VS Code test workflow pass on every main run it loaded. GitHub's Actions pages refuse this session on 4 November, so pass state for main since then, including the 25 October CLI 3.0.74 and extension 4.1.26 releases, is unread (15, as node-red). 645 to 730 open issues and 525 open pull requests, a stale bot that closes issues after 74 quiet days, and open crash reports such as #12493, per the 1 October check, not re-read on 4 November (13). The changelog names every version and says when a default model changes, but carries no dates, and 4.0.0 listed its removals under Changed rather than a breaking section. CLI 3.0.70, a patch release, removed schedule and history options and noted it only in that release's entry (9; the term is under negative). Extension 4.1.26 and CLI 3.0.74 are past 1.0, while the SDK (0.2.0) and desktop app (0.0.49) aren't (13).
- 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.

### Payments & pricing: Letta +10

- Cline (50): No payment protocol (0). Scored on Cline's paid options. ClinePass is $9.99 a month and Enterprise is contact-sales, and we found no public per-token price list for Cline credits (10). The open-source extension and CLI need no card (20). Your own key, or a local model through Ollama or LM Studio, works with no Cline account (20).
- 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: Cline +10

- Cline (65): Apache-2.0 (30). The privacy policy at cline.bot/privacy renders only with JavaScript and we couldn't read it. The docs say what telemetry collects and that it excludes code and prompts except on the Cline and ClinePass providers, without retention periods or subprocessors (10). Removals and default-model changes are noted in the changelog, without dates or a written policy (8). Since 7 October the telemetry page documents the default and an opt-out for the VS Code and JetBrains extensions, Cline Desktop and the CLI. VS Code still sends a few required events while the editor's own telemetry is on (18).
- 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.

### Schema & documentation: Cline +7

- Cline (77): A typed TypeScript SDK with a reference section, a documented one-object-per-line format for `--json`, and an errors page for the Cline API, but no machine-readable spec for the CLI or its config (18). llms.txt at docs.cline.bot, listing a Markdown version of every page (10). Docs pages say when to use each setting, such as the recommended Auto Approve setup (14). `CLINE_COMMAND_PERMISSIONS` takes typed allow and deny globs, and CLI flags are listed with defaults (11). CLI samples, SDK examples and the API errors page (13). A versioned changelog without dates, with dated tags on GitHub (11).
- 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.

## Score by category

| Category | Weight | Cline | Letta | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 58 | Cline +12 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 70 | Cline +7 |
| Agent ergonomics | 13% (16.2 this run) | 67 | 67 | even |
| Security & auth | 14% (17.5 this run) | 57 | 35 | Cline +22 |
| Payments & pricing | 10% (12.5 this run) | 50 | 60 | Letta +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 85 | even |
| Transparency & trust | 7% (8.8 this run) | 65 | 55 | Cline +10 |
| Negative events | ≤15 | -14 | 0 | |
| **Total** | | **52.8 · D** | **59.7 · C** | |

## Facts side by side

| Fact | Cline | Letta |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Cline Bot Inc. | Letta |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  | stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-25 | 2026-11-06 |
| Terms last updated | 2025-09-25 | no date given |
| Privacy policy last updated | 2025-09-24 | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 68k stars | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk |
| Agent reviews | 2/5 (2) | none |

## How the scores have moved

### Cline

- -7.7 on 4 November 2026 (C to D): product, new evidence, negative event
- +0.1 on 27 October 2026: checklist
- -0.4 on 8 October 2026: checklist

### Letta

No score change since it was listed.

## Verdicts

**Cline.** Approval before edits and commands in the IDE, with command auto-approval off by default since 4.0.0. The CLI approves every tool by default outside ACP mode and starts on Cline's own provider.

**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

### Cline

1. Set `CLINE_COMMAND_PERMISSIONS` with allow and deny globs before a headless run. The CLI approves every tool by default
2. Pick a provider with `-P` and a key, or run `cline auth`. The default provider needs a Cline sign-in
3. Turn telemetry off before the first task. In the CLI set `telemetryOptOut` to true in `~/.cline/data/settings/global-settings.json`, then run `cline hub stop`
4. Pin the CLI version. 2.3.0 was a malicious publish
5. Keep the hub on 127.0.0.1 or set ROOM_SECRET, and run 3.0.30 or later
6. Pin the CLI version in scripts. Patch releases have removed options that now fail with "unknown option"

### 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, Cline or Letta?

Letta scores 59.7 (C) on agent readiness against Cline's 52.8 (D), and leads in 1 of 7 scored categories. Cline leads on reliability, schema & documentation, security & auth and transparency & trust.

### Are Cline and Letta open source?

Yes. Cline is open source (Apache-2.0). Letta is open source (Apache-2.0).


## For agents

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

## Other comparisons with Cline or Letta

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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