{ "data": { "a": { "slug": "letta", "name": "Letta", "vendor": "Letta", "vendorUrl": "https://www.letta.com", "kind": "harness", "category": "agent-harnesses", "summary": "Letta, from the MemGPT team, is an open-source agent harness (formerly Letta Code) for stateful agents that keep memory blocks, skills and conversations across sessions, used from a CLI, chat.letta.com, messaging channels or the Agent SDK, with Letta Cloud.", "url": "https://www.anchorterminal.com/tools/letta", "markdownUrl": "https://www.anchorterminal.com/tools/letta.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/letta.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/letta.json", "dns": "letta.grade.anchorterminal.com", "repo": "https://github.com/letta-ai/letta-code", "license": "Apache-2.0", "transports": [ "stdio" ], "packages": [ { "registry": "npm", "name": "@letta-ai/letta-code" }, { "registry": "pypi", "name": "letta" } ], "auth": "mixed", "authNotes": "Local use needs only the user's own model keys or coding-plan logins through `/connect`. Signing in with Letta (`/login`, OAuth in the browser) stores agents in Letta Cloud and enables remote computers and secrets. Developer plans use Letta API keys.", "pricing": "freemium", "pricingNotes": "Free plan at $0 with bring-your-own keys and limited agents and storage. Pro $20 a month with Letta Auto quotas and up to 20 agents. API plan $20 a month plus $0.10 per active agent a month and $0.00015 a second of tool execution, with LLM usage at token cost.", "priceSummary": "$20 / mo", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the letta-code source, docs.letta.com's llms.txt or the pricing page (checked 2026-11-06).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 3793, "npmWeekly": 85863, "pypiWeekly": 2225, "asOf": "2026-11-06" }, "docsUrl": "https://docs.letta.com", "llmsTxt": "https://docs.letta.com/llms.txt", "capabilities": [ "agent.harness", "agent.mcp-client", "agent.multi-agent", "memory.store", "memory.search" ], "tags": [ "open-source", "local", "hosted", "freemium", "apache-2.0", "typescript", "cli", "headless", "telemetry", "llms-txt", "memory" ], "lastRelease": "2026-11-06", "graded": true, "anchor": { "graded": true, "score": 59.7, "grade": "C", "agentReady": false, "rank": 684, "ranked": true, "rankOf": 1486, "categoryRank": 18, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 67, "maintenance": 85, "payments": 60, "reliability": 58, "schema": 70, "security": 35, "transparency": 55 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "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.", "bestFor": "Long-lived coding agents and assistants that keep memory and identity across sessions and machines.", "strengths": [ "Apache-2.0 harness on npm and PyPI with 0.34.42 released on 6 November 2026, and releases most days", "Memory blocks and MemFS keep an agent's context in git, with optional sync to the user's own repository", "Headless runs with `-p` and `--output-format json`, plus a TypeScript Agent SDK and a self-hosted App Server", "Public prices, a $0 plan with bring-your-own keys, and an API plan at $20 a month plus $0.10 per active agent", "Runs locally without signing in, with `letta backend local` or `--backend local`" ], "weaknesses": [ "The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode", "Letta Cloud is the default backend, so agent memory and conversations go to Letta's servers unless the user chooses local", "Usage telemetry is on by default, with the LETTA_CODE_TELEM=0 opt-out found only in the source", "The Letta V1 Python API server is retired and unsupported, and the letta-ai/letta repository is now a landing page", "The privacy policy names no legal entity or date and says hosted message data may train future models" ], "agentNotes": [ "Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools", "Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default", "Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent", "Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output", "Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 59.7 } ], "editorialScores": { "ergonomics": 67, "maintenance": 85, "payments": 60, "reliability": 58, "schema": 70, "security": 35, "transparency": 55 }, "provenanceScore": 54, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "npm install -g @letta-ai/letta-code", "headless": { "local": "letta --backend local", "run": "letta -p --output-format json \"\u003ctask\u003e\"", "server": "letta server" } }, "letme": { "capability": "https://letme.dev/agent.harness", "tool": "https://letme.dev/letta" }, "alsoIn": [ "agent-memory" ], "area": "frameworks", "unitPrices": [ { "item": "Pro plan", "unit": "month", "usd": 20, "note": "Letta Auto quotas, up to 20 agents" }, { "item": "API plan active agent", "unit": "month", "usd": 0.1, "note": "Plus $20 a month base and $0.00015 a second of tool execution" } ], "provenance": { "legalEntity": "", "domain": "letta.com", "domainRegistered": "1997-10-01", "endpointOnVendorDomain": null, "terms": "https://www.letta.com/terms-of-service", "privacy": "https://www.letta.com/privacy-policy", "statusPage": "", "changelog": "https://github.com/letta-ai/letta-code/releases", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The privacy policy shows no last-updated date and names no legal entity, only Letta. It says hosted message data may be used to train new models and that basic telemetry can be turned off in settings when supported.", "www.letta.com and docs.letta.com robots.txt allow all crawlers.", "RDAP gives letta.com a registration date of 1 October 1997, which predates the company, so the domain was bought later.", "/.well-known/security.txt returns 404. SECURITY.md in letta-ai/letta asks for reports to support@letta.com.", "The terms URL is the conventional path and was not read; the policy reader checks it at landing." ], "score": 54 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/letta.json", "live": { "slug": "letta", "versions": [ { "registry": "github", "name": "letta-ai/letta-code", "version": "v0.34.43", "released": "2026-11-06", "seenAt": "2026-11-06T23:39:39.434291816Z" }, { "registry": "npm", "name": "@letta-ai/letta-code", "version": "0.34.43", "seenAt": "2026-11-06T23:39:38.413416142Z" }, { "registry": "pypi", "name": "letta", "version": "0.34.12", "released": "2026-10-12", "seenAt": "2026-11-06T23:39:39.241816797Z" } ], "githubStars": 3794, "npmWeekly": 85863, "pypiWeekly": 2225, "securityTxt": { "url": "https://letta.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:02.768002207Z" }, "llmsTxt": { "url": "https://docs.letta.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:52.28674296Z" }, "pages": [ { "url": "https://www.letta.com/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:30:46.549817082Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "947a68f3e3a0" }, { "url": "https://www.letta.com/terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:30:48.740250784Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "63f31d6ebfb8" } ], "updatedAt": "2026-11-07T16:01:02.768002207Z" } }, "answer": "Letta scores 59.7 (C) on agent readiness against Orca's 57.4 (C), and leads in 4 of 7 scored categories. Orca leads on security \u0026 auth.", "b": { "slug": "orca", "name": "Orca", "vendor": "Lovecast Inc.", "vendorUrl": "https://www.onorca.dev", "kind": "harness", "category": "agent-harnesses", "summary": "Orca is an open-source app that runs Claude Code, Codex and other coding agents in parallel, each in its own worktree, in chat or terminal, on a laptop or in the cloud, with an orchestrator that splits tasks across workers.", "url": "https://www.anchorterminal.com/tools/orca", "markdownUrl": "https://www.anchorterminal.com/tools/orca.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/orca.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/orca.json", "dns": "orca.grade.anchorterminal.com", "repo": "https://github.com/stablyai/orca", "license": "MIT", "transports": [], "packages": [], "auth": "none", "pricing": "free", "pricingNotes": "Free and open source. You pay for the coding agents it runs, through your own subscriptions or API keys (checked 2026-11-07).", "priceSummary": "Free · OSS", "where": "local", "x402": { "level": "no", "evidence": "No payment protocol in the repository or README (checked 2026-11-07).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-07" }, "docsUrl": "https://www.onorca.dev/docs", "capabilities": [ "agent.harness", "agent.multi-agent" ], "tags": [ "open-source", "mit", "desktop-app", "mobile", "cli", "telemetry", "new" ], "lastRelease": "2026-11-06", "graded": true, "anchor": { "graded": true, "score": 57.4, "grade": "C", "agentReady": false, "rank": 791, "ranked": true, "rankOf": 1486, "categoryRank": 25, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 70, "maintenance": 75, "payments": 40, "reliability": 58, "schema": 65, "security": 43, "transparency": 54 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "low", "date": "2026-11-07" }, "negative": 0, "verdict": "An open-source orchestrator for coding agents with worker agents in their own worktrees, chat and terminal views, a browser and a CLI, on desktop and mobile, with heavy test automation. It collects anonymous usage data by default, and the cloud option's pricing wasn't found.", "bestFor": "Developers who want an orchestrator agent to split work across parallel coding agents, on desktop or mobile.", "strengths": [ "An orchestrator agent splits a task across worker agents in their own workspaces", "Chat UI or the raw CLI, switching without losing context", "Desktop and mobile apps and a CLI", "MIT, with extensive unit and end-to-end CI" ], "weaknesses": [ "Anonymous usage data collected by default, with an opt-out", "Cloud pricing not found on the pages read", "No changelog file" ], "agentNotes": [ "See the telemetry docs on onorca.dev to opt out of anonymous usage data", "Use the orchestration CLI to hand a large task to one agent that starts workers" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "low", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 57.4 } ], "editorialScores": { "ergonomics": 70, "maintenance": 75, "payments": 40, "reliability": 58, "schema": 65, "security": 43, "transparency": 68 }, "provenanceScore": 40, "checked": { "categories": { "ergonomics": "2026-11-07", "maintenance": "2026-11-07", "payments": "2026-11-07", "reliability": "2026-11-07", "schema": "2026-11-07", "security": "2026-11-07", "transparency": "2026-11-07" }, "last": "2026-11-07", "oldest": "2026-11-07", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "Download from the releases page or Homebrew (Casks in the repository)" }, "letme": { "capability": "https://letme.dev/agent.harness", "tool": "https://letme.dev/orca" }, "area": "frameworks", "provenance": { "legalEntity": "Lovecast Inc.", "domain": "onorca.dev", "domainRegistered": "", "domainNote": "Not looked up: RDAP isn't requested under the 1 November 2026 rules.", "endpointOnVendorDomain": null, "terms": "", "privacy": "", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-11-07", "notes": [ "The licence names Lovecast Inc.. The repository is github.com/stablyai/orca." ], "score": 40 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/orca.json", "live": { "slug": "orca", "securityTxt": { "url": "https://onorca.dev/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:18.358018303Z" }, "updatedAt": "2026-11-07T16:01:18.358018303Z" } }, "edges": [ { "by": 20, "category": "payments", "leads": "letta", "name": "Payments \u0026 pricing", "reasons": { "a": "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.", "b": "Scored on the cloud option. No protocol (0). The cloud price wasn't found on the pages read (0). The desktop app is free and MIT with no card (20). The local app needs no sign-up that we found (20). 0 + 0 + 20 + 20 = 40." }, "scores": { "a": 60, "b": 40 } }, { "by": 10, "category": "maintenance", "leads": "letta", "name": "Maintenance \u0026 community", "reasons": { "a": "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.", "b": "Tags to v1.4.251 and commits on 6 November 2026 (30). Many 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 builds (15). Extensive CI (10). 30 + 20 + 0 + 15 + 10 = 75." }, "scores": { "a": 85, "b": 75 } }, { "by": 8, "category": "security", "leads": "orca", "name": "Security \u0026 auth", "reasons": { "a": "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.", "b": "Harness reading. Anonymous usage data with an opt-out, per the README's link to its telemetry docs (15 of 30). Worktrees per agent and a sandboxed Linux build (12 of 20). No prompt-injection guidance (5). No audit log (5). A dependency-security workflow (6 of 20). 15 + 12 + 5 + 5 + 6 = 43." }, "scores": { "a": 35, "b": 43 } }, { "by": 5, "category": "schema", "leads": "letta", "name": "Schema \u0026 documentation", "reasons": { "a": "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.", "b": "Harness reading. A docs site with CLI orchestration and native chat pages (65)." }, "scores": { "a": 70, "b": 65 } } ], "facts": [ { "a": "Agent harness", "b": "Agent harness", "name": "Kind" }, { "a": "Letta", "b": "Lovecast Inc.", "name": "Vendor" }, { "a": "no (local only)", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "stdio", "b": "", "name": "Transports" }, { "a": "OAuth or key", "b": "None", "name": "Auth" }, { "a": "Freemium", "b": "Free", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Apache-2.0", "b": "MIT", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "no", "name": "llms.txt" }, { "a": "2026-11-06", "b": "2026-11-06", "name": "Last release" }, { "a": "no date given", "b": "no document linked", "name": "Terms last updated" }, { "a": "no date given", "b": "no document linked", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not read yet", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not read yet", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not read yet", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not read yet", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not read yet", "name": "Arbitration or class-action waiver" }, { "a": "3.8k stars, 86k npm/wk, 2.2k PyPI/wk", "b": "none", "name": "Popularity" } ], "faq": [ { "answer": "Letta scores 59.7 (C) on agent readiness against Orca's 57.4 (C), and leads in 4 of 7 scored categories. Orca leads on security \u0026 auth.", "question": "Which is better for AI agents, Letta or Orca?" }, { "answer": "Yes. Letta is open source (Apache-2.0). Orca is open source (MIT).", "question": "Are Letta and Orca open source?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 70 against 65", "Payments \u0026 pricing, 60 against 40", "Maintenance \u0026 community, 85 against 75" ], "also": [ "Runs on your own machine" ], "goodFor": "Long-lived coding agents and assistants that keep memory and identity across sessions and machines.", "slug": "letta", "watchFor": "The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode" }, { "aheadOn": [ "Security \u0026 auth, 43 against 35" ], "also": [ "No key needed to call it" ], "goodFor": "Developers who want an orchestrator agent to split work across parallel coding agents, on desktop or mobile.", "slug": "orca", "watchFor": "Anonymous usage data collected by default, with an opt-out" } ], "history": null, "job": { "capability": "agent.harness", "name": "Agent harnesses" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-letta.json", "title": "Agent Zero vs Letta", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-orca.json", "title": "Agent Zero vs Orca", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/aider-vs-letta.json", "title": "Aider vs Letta", "url": "https://www.anchorterminal.com/compare/aider-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/aider-vs-orca.json", "title": "Aider vs Orca", "url": "https://www.anchorterminal.com/compare/aider-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/amp-vs-letta.json", "title": "Amp vs Letta", "url": "https://www.anchorterminal.com/compare/amp-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/amp-vs-orca.json", "title": "Amp vs Orca", "url": "https://www.anchorterminal.com/compare/amp-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/antigravity-cli-vs-letta.json", "title": "Antigravity CLI vs Letta", "url": "https://www.anchorterminal.com/compare/antigravity-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/antigravity-cli-vs-orca.json", "title": "Antigravity CLI vs Orca", "url": "https://www.anchorterminal.com/compare/antigravity-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/auggie-vs-letta.json", "title": "Auggie CLI vs Letta", "url": "https://www.anchorterminal.com/compare/auggie-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/auggie-vs-orca.json", "title": "Auggie CLI vs Orca", "url": "https://www.anchorterminal.com/compare/auggie-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/axlr-vs-letta.json", "title": "AXLR vs Letta", "url": "https://www.anchorterminal.com/compare/axlr-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/axlr-vs-orca.json", "title": "AXLR vs Orca", "url": "https://www.anchorterminal.com/compare/axlr-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/claude-code-vs-letta.json", "title": "Claude Code vs Letta", "url": "https://www.anchorterminal.com/compare/claude-code-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/claude-code-vs-orca.json", "title": "Claude Code vs Orca", "url": "https://www.anchorterminal.com/compare/claude-code-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/cline-vs-letta.json", "title": "Cline vs Letta", "url": "https://www.anchorterminal.com/compare/cline-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/cline-vs-orca.json", "title": "Cline vs Orca", "url": "https://www.anchorterminal.com/compare/cline-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/conductor-vs-letta.json", "title": "Conductor vs Letta", "url": "https://www.anchorterminal.com/compare/conductor-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/conductor-vs-orca.json", "title": "Conductor vs Orca", "url": "https://www.anchorterminal.com/compare/conductor-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/crush-vs-letta.json", "title": "Crush vs Letta", "url": "https://www.anchorterminal.com/compare/crush-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/crush-vs-orca.json", "title": "Crush vs Orca", "url": "https://www.anchorterminal.com/compare/crush-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/cursor-cli-vs-letta.json", "title": "Cursor CLI vs Letta", "url": "https://www.anchorterminal.com/compare/cursor-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/cursor-cli-vs-orca.json", "title": "Cursor CLI vs Orca", "url": "https://www.anchorterminal.com/compare/cursor-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.json", "title": "DeepSeek Harness (dsh) vs Letta", "url": "https://www.anchorterminal.com/compare/deepseek-harness-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/deepseek-harness-vs-orca.json", "title": "DeepSeek Harness (dsh) vs Orca", "url": "https://www.anchorterminal.com/compare/deepseek-harness-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta.json", "title": "dsh-superagent (DeepSeek) vs Letta", "url": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-orca.json", "title": "dsh-superagent (DeepSeek) vs Orca", "url": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/devin-vs-letta.json", "title": "Devin vs Letta", "url": "https://www.anchorterminal.com/compare/devin-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/devin-vs-orca.json", "title": "Devin vs Orca", "url": "https://www.anchorterminal.com/compare/devin-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/droid-cli-vs-letta.json", "title": "Droid CLI vs Letta", "url": "https://www.anchorterminal.com/compare/droid-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/droid-cli-vs-orca.json", "title": "Droid CLI vs Orca", "url": "https://www.anchorterminal.com/compare/droid-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/earendil-pi-vs-letta.json", "title": "Pi vs Letta", "url": "https://www.anchorterminal.com/compare/earendil-pi-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/earendil-pi-vs-orca.json", "title": "Pi vs Orca", "url": "https://www.anchorterminal.com/compare/earendil-pi-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/emdash-vs-letta.json", "title": "Emdash vs Letta", "url": "https://www.anchorterminal.com/compare/emdash-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/emdash-vs-orca.json", "title": "Emdash vs Orca", "url": "https://www.anchorterminal.com/compare/emdash-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/gemini-cli-vs-letta.json", "title": "Gemini CLI vs Letta", "url": "https://www.anchorterminal.com/compare/gemini-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/gemini-cli-vs-orca.json", "title": "Gemini CLI vs Orca", "url": "https://www.anchorterminal.com/compare/gemini-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/github-copilot-cli-vs-letta.json", "title": "GitHub Copilot CLI vs Letta", "url": "https://www.anchorterminal.com/compare/github-copilot-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/github-copilot-cli-vs-orca.json", "title": "GitHub Copilot CLI vs Orca", "url": "https://www.anchorterminal.com/compare/github-copilot-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/goose-vs-letta.json", "title": "goose vs Letta", "url": "https://www.anchorterminal.com/compare/goose-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/goose-vs-orca.json", "title": "goose vs Orca", "url": "https://www.anchorterminal.com/compare/goose-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/harness2-vs-letta.json", "title": "Harness² vs Letta", "url": "https://www.anchorterminal.com/compare/harness2-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/harness2-vs-orca.json", "title": "Harness² vs Orca", "url": "https://www.anchorterminal.com/compare/harness2-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/harnessrouter-vs-letta.json", "title": "HarnessRouter vs Letta", "url": "https://www.anchorterminal.com/compare/harnessrouter-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/harnessrouter-vs-orca.json", "title": "HarnessRouter vs Orca", "url": "https://www.anchorterminal.com/compare/harnessrouter-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/jules-vs-letta.json", "title": "Jules vs Letta", "url": "https://www.anchorterminal.com/compare/jules-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/jules-vs-orca.json", "title": "Jules vs Orca", "url": "https://www.anchorterminal.com/compare/jules-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/junie-vs-letta.json", "title": "Junie CLI vs Letta", "url": "https://www.anchorterminal.com/compare/junie-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/junie-vs-orca.json", "title": "Junie CLI vs Orca", "url": "https://www.anchorterminal.com/compare/junie-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-letta.json", "title": "Kilo Code CLI vs Letta", "url": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-orca.json", "title": "Kilo Code CLI vs Orca", "url": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-letta.json", "title": "Kimi Code CLI vs Letta", "url": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-orca.json", "title": "Kimi Code CLI vs Orca", "url": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/kiro-cli-vs-letta.json", "title": "Kiro CLI vs Letta", "url": "https://www.anchorterminal.com/compare/kiro-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/kiro-cli-vs-orca.json", "title": "Kiro CLI vs Orca", "url": "https://www.anchorterminal.com/compare/kiro-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-mini-swe-agent.json", "title": "Letta vs mini-swe-agent", "url": "https://www.anchorterminal.com/compare/letta-vs-mini-swe-agent" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-minimax-code.json", "title": "Letta vs MiniMax Code", "url": "https://www.anchorterminal.com/compare/letta-vs-minimax-code" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-mistral-vibe-cli.json", "title": "Letta vs Mistral Vibe CLI", "url": "https://www.anchorterminal.com/compare/letta-vs-mistral-vibe-cli" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-muse-code.json", "title": "Letta vs Muse Code", "url": "https://www.anchorterminal.com/compare/letta-vs-muse-code" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-openai-agents-api.json", "title": "Letta vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/letta-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-openai-codex.json", "title": "Letta vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/letta-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-opencode.json", "title": "Letta vs OpenCode", "url": "https://www.anchorterminal.com/compare/letta-vs-opencode" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-openhands.json", "title": "Letta vs OpenHands", "url": "https://www.anchorterminal.com/compare/letta-vs-openhands" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-openmausbot.json", "title": "Letta vs OpenMausBot", "url": "https://www.anchorterminal.com/compare/letta-vs-openmausbot" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-paseo.json", "title": "Letta vs Paseo", "url": "https://www.anchorterminal.com/compare/letta-vs-paseo" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-prime-agent.json", "title": "Letta vs Prime Agent", "url": "https://www.anchorterminal.com/compare/letta-vs-prime-agent" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-qoder-cli.json", "title": "Letta vs Qoder CLI", "url": "https://www.anchorterminal.com/compare/letta-vs-qoder-cli" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-qwen-code.json", "title": "Letta vs Qwen Code", "url": "https://www.anchorterminal.com/compare/letta-vs-qwen-code" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-reflection-mirror.json", "title": "Letta vs Mirror CLI", "url": "https://www.anchorterminal.com/compare/letta-vs-reflection-mirror" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-rovo-dev-cli.json", "title": "Letta vs Rovo Dev CLI", "url": "https://www.anchorterminal.com/compare/letta-vs-rovo-dev-cli" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-sculptor.json", "title": "Letta vs Sculptor", "url": "https://www.anchorterminal.com/compare/letta-vs-sculptor" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-t3-code.json", "title": "Letta vs T3 Code", "url": "https://www.anchorterminal.com/compare/letta-vs-t3-code" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-traycer.json", "title": "Letta vs Traycer", "url": "https://www.anchorterminal.com/compare/letta-vs-traycer" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-unstoppable.json", "title": "Letta vs Unstoppable", "url": "https://www.anchorterminal.com/compare/letta-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-verdent.json", "title": "Letta vs Verdent", "url": "https://www.anchorterminal.com/compare/letta-vs-verdent" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-vibe-trading.json", "title": "Letta vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/letta-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-warp.json", "title": "Letta vs Warp (Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/letta-vs-warp" }, { "json": "https://www.anchorterminal.com/compare/mini-swe-agent-vs-orca.json", "title": "mini-swe-agent vs Orca", "url": "https://www.anchorterminal.com/compare/mini-swe-agent-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/minimax-code-vs-orca.json", "title": "MiniMax Code vs Orca", "url": "https://www.anchorterminal.com/compare/minimax-code-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-orca.json", "title": "Mistral Vibe CLI vs Orca", "url": "https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/muse-code-vs-orca.json", "title": "Muse Code vs Orca", "url": "https://www.anchorterminal.com/compare/muse-code-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-orca.json", "title": "OpenAI Agents API vs Orca", "url": "https://www.anchorterminal.com/compare/openai-agents-api-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-orca.json", "title": "OpenAI Codex vs Orca", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/opencode-vs-orca.json", "title": "OpenCode vs Orca", "url": "https://www.anchorterminal.com/compare/opencode-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/openhands-vs-orca.json", "title": "OpenHands vs Orca", "url": "https://www.anchorterminal.com/compare/openhands-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-paseo.json", "title": "Orca vs Paseo", "url": "https://www.anchorterminal.com/compare/orca-vs-paseo" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-prime-agent.json", "title": "Orca vs Prime Agent", "url": "https://www.anchorterminal.com/compare/orca-vs-prime-agent" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-qoder-cli.json", "title": "Orca vs Qoder CLI", "url": "https://www.anchorterminal.com/compare/orca-vs-qoder-cli" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-qwen-code.json", "title": "Orca vs Qwen Code", "url": "https://www.anchorterminal.com/compare/orca-vs-qwen-code" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-reflection-mirror.json", "title": "Orca vs Mirror CLI", "url": "https://www.anchorterminal.com/compare/orca-vs-reflection-mirror" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-rovo-dev-cli.json", "title": "Orca vs Rovo Dev CLI", "url": "https://www.anchorterminal.com/compare/orca-vs-rovo-dev-cli" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-sculptor.json", "title": "Orca vs Sculptor", "url": "https://www.anchorterminal.com/compare/orca-vs-sculptor" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-t3-code.json", "title": "Orca vs T3 Code", "url": "https://www.anchorterminal.com/compare/orca-vs-t3-code" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-traycer.json", "title": "Orca vs Traycer", "url": "https://www.anchorterminal.com/compare/orca-vs-traycer" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-unstoppable.json", "title": "Orca vs Unstoppable", "url": "https://www.anchorterminal.com/compare/orca-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-verdent.json", "title": "Orca vs Verdent", "url": "https://www.anchorterminal.com/compare/orca-vs-verdent" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-vibe-trading.json", "title": "Orca vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/orca-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-warp.json", "title": "Orca vs Warp (Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/orca-vs-warp" }, { "json": "https://www.anchorterminal.com/compare/clawboo-vs-letta.json", "title": "Clawboo vs Letta", "url": "https://www.anchorterminal.com/compare/clawboo-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/clawboo-vs-orca.json", "title": "Clawboo vs Orca", "url": "https://www.anchorterminal.com/compare/clawboo-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/cli-manager-vs-letta.json", "title": "CLI Manager vs Letta", "url": "https://www.anchorterminal.com/compare/cli-manager-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/cli-manager-vs-orca.json", "title": "CLI Manager vs Orca", "url": "https://www.anchorterminal.com/compare/cli-manager-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.json", "title": "Harness vs Letta", "url": "https://www.anchorterminal.com/compare/harness-autonomous-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/harness-autonomous-vs-orca.json", "title": "Harness vs Orca", "url": "https://www.anchorterminal.com/compare/harness-autonomous-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-paperclip.json", "title": "Letta vs Paperclip", "url": "https://www.anchorterminal.com/compare/letta-vs-paperclip" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents.json", "title": "Letta vs Parallax", "url": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents" }, { "json": "https://www.anchorterminal.com/compare/openmausbot-vs-orca.json", "title": "OpenMausBot vs Orca", "url": "https://www.anchorterminal.com/compare/openmausbot-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-paperclip.json", "title": "Orca vs Paperclip", "url": "https://www.anchorterminal.com/compare/orca-vs-paperclip" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-parallax-agents.json", "title": "Orca vs Parallax", "url": "https://www.anchorterminal.com/compare/orca-vs-parallax-agents" } ], "panel": null, "scores": [ { "by": 0, "edge": "", "key": "reliability", "letta": 58, "name": "Reliability", "orca": 58, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 5, "edge": "letta", "key": "schema", "letta": 70, "name": "Schema \u0026 documentation", "orca": 65, "weight": 13 }, { "by": 3, "edge": "orca", "key": "ergonomics", "letta": 67, "name": "Agent ergonomics", "orca": 70, "weight": 13 }, { "by": 8, "edge": "orca", "key": "security", "letta": 35, "name": "Security \u0026 auth", "orca": 43, "weight": 14 }, { "by": 20, "edge": "letta", "key": "payments", "letta": 60, "name": "Payments \u0026 pricing", "orca": 40, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 10, "edge": "letta", "key": "maintenance", "letta": 85, "name": "Maintenance \u0026 community", "orca": 75, "weight": 7 }, { "by": 1, "edge": "letta", "key": "transparency", "letta": 55, "name": "Transparency \u0026 trust", "orca": 54, "weight": 7 } ], "summary": "Letta scores 59.7 (C) on agent readiness against Orca's 57.4 (C), and leads in 4 of 7 scored categories. Orca leads on security \u0026 auth. Both do agent harnesses.", "tasks": null, "tutorials": [], "verdicts": { "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.", "orca": "An open-source orchestrator for coding agents with worker agents in their own worktrees, chat and terminal views, a browser and a CLI, on desktop and mobile, with heavy test automation. It collects anonymous usage data by default, and the cloud option's pricing wasn't found." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/letta-vs-orca", "json": "https://www.anchorterminal.com/compare/letta-vs-orca.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/letta-vs-orca.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/letta-vs-orca.min.md" }, "markdown": "Letta scores 59.7 (C) on agent readiness against Orca's 57.4 (C), and leads in 4 of 7 scored categories. Orca leads on security \u0026 auth. Both do agent harnesses.\n\n- 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\n- Orca: grade C, 57.4/100, rank #791 of 1486. Markdown https://www.anchorterminal.com/tools/orca.md · JSON https://www.anchorterminal.com/api/v1/tools/orca.json\n- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md\n- All 1500 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md\n- Best memory layers for AI agents: https://www.anchorterminal.com/best/agent-memory/index.md\n- All 353 memory comparisons: https://www.anchorterminal.com/compare/agent-memory/index.md\n\n## Which one, for what\n\n### Letta (C)\n\nGood for: Long-lived coding agents and assistants that keep memory and identity across sessions and machines.\n\nAhead on:\n- Schema \u0026 documentation, 70 against 65\n- Payments \u0026 pricing, 60 against 40\n- Maintenance \u0026 community, 85 against 75\n\nAlso in its favour:\n- Runs on your own machine\n\nWatch for: The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode\n\n### Orca (C)\n\nGood for: Developers who want an orchestrator agent to split work across parallel coding agents, on desktop or mobile.\n\nAhead on:\n- Security \u0026 auth, 43 against 35\n\nAlso in its favour:\n- No key needed to call it\n\nWatch for: Anonymous usage data collected by default, with an opt-out\n\n\n## Why the edge\n\n### Payments \u0026 pricing: Letta +20\n\n- 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.\n- Orca (40): Scored on the cloud option. No protocol (0). The cloud price wasn't found on the pages read (0). The desktop app is free and MIT with no card (20). The local app needs no sign-up that we found (20). 0 + 0 + 20 + 20 = 40.\n\n### Maintenance \u0026 community: Letta +10\n\n- 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.\n- Orca (75): Tags to v1.4.251 and commits on 6 November 2026 (30). Many 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 builds (15). Extensive CI (10). 30 + 20 + 0 + 15 + 10 = 75.\n\n### Security \u0026 auth: Orca +8\n\n- 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.\n- Orca (43): Harness reading. Anonymous usage data with an opt-out, per the README's link to its telemetry docs (15 of 30). Worktrees per agent and a sandboxed Linux build (12 of 20). No prompt-injection guidance (5). No audit log (5). A dependency-security workflow (6 of 20). 15 + 12 + 5 + 5 + 6 = 43.\n\n### Schema \u0026 documentation: Letta +5\n\n- 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.\n- Orca (65): Harness reading. A docs site with CLI orchestration and native chat pages (65).\n\n## Score by category\n\n| Category | Weight | Letta | Orca | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 58 | 58 | even |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 70 | 65 | Letta +5 |\n| Agent ergonomics | 13% (16.2 this run) | 67 | 70 | Orca +3 |\n| Security \u0026 auth | 14% (17.5 this run) | 35 | 43 | Orca +8 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 40 | Letta +20 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 85 | 75 | Letta +10 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 55 | 54 | Letta +1 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **59.7 · C** | **57.4 · C** | |\n\n## Facts side by side\n\n| Fact | Letta | Orca |\n| --- | --- | --- |\n| Kind | Agent harness | Agent harness |\n| Vendor | Letta | Lovecast Inc. |\n| Hosted endpoint | no (local only) | no (local only) |\n| Transports | stdio | |\n| Auth | OAuth or key | None |\n| Pricing | Freemium | Free |\n| x402 | no | no |\n| Licence | Apache-2.0 | MIT |\n| Read-only variant documented | no | no |\n| llms.txt | yes | no |\n| Last release | 2026-11-06 | 2026-11-06 |\n| Terms last updated | no date given | no document linked |\n| Privacy policy last updated | no date given | no document linked |\n| Customer content may train models | not found in the text | not read yet |\n| Terms restrict automated access | not found in the text | not read yet |\n| Terms restrict benchmarking | not found in the text | not read yet |\n| Terms or service can change without notice | not found in the text | not read yet |\n| Arbitration or class-action waiver | yes | not read yet |\n| Popularity | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk | none |\n\n## Verdicts\n\n**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.\n\n**Orca.** An open-source orchestrator for coding agents with worker agents in their own worktrees, chat and terminal views, a browser and a CLI, on desktop and mobile, with heavy test automation. It collects anonymous usage data by default, and the cloud option's pricing wasn't found.\n\n## Before you call either\n\n### Letta\n\n1. Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools\n2. Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default\n3. Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent\n4. Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output\n5. Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone\n\n### Orca\n\n1. See the telemetry docs on onorca.dev to opt out of anonymous usage data\n2. Use the orchestration CLI to hand a large task to one agent that starts workers\n\n## Questions\n\n### Which is better for AI agents, Letta or Orca?\n\nLetta scores 59.7 (C) on agent readiness against Orca's 57.4 (C), and leads in 4 of 7 scored categories. Orca leads on security \u0026 auth.\n\n### Are Letta and Orca open source?\n\nYes. Letta is open source (Apache-2.0). Orca is open source (MIT).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/letta-vs-orca.json, and with the fewest tokens: https://www.anchorterminal.com/compare/letta-vs-orca.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"letta\", \"b\": \"orca\"}`. From a terminal: `anchor compare letta orca`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/letta.json and https://www.anchorterminal.com/api/v1/tools/orca.json\n\n## Other comparisons with Letta or Orca\n\n- [Agent Zero vs Letta](https://www.anchorterminal.com/compare/agent-zero-vs-letta.md)\n- [Agent Zero vs Orca](https://www.anchorterminal.com/compare/agent-zero-vs-orca.md)\n- [Aider vs Letta](https://www.anchorterminal.com/compare/aider-vs-letta.md)\n- [Aider vs Orca](https://www.anchorterminal.com/compare/aider-vs-orca.md)\n- [Amp vs Letta](https://www.anchorterminal.com/compare/amp-vs-letta.md)\n- [Amp vs Orca](https://www.anchorterminal.com/compare/amp-vs-orca.md)\n- [Antigravity CLI vs Letta](https://www.anchorterminal.com/compare/antigravity-cli-vs-letta.md)\n- [Antigravity CLI vs Orca](https://www.anchorterminal.com/compare/antigravity-cli-vs-orca.md)\n- [Auggie CLI vs Letta](https://www.anchorterminal.com/compare/auggie-vs-letta.md)\n- [Auggie CLI vs Orca](https://www.anchorterminal.com/compare/auggie-vs-orca.md)\n- [AXLR vs Letta](https://www.anchorterminal.com/compare/axlr-vs-letta.md)\n- [AXLR vs Orca](https://www.anchorterminal.com/compare/axlr-vs-orca.md)\n- [Claude Code vs Letta](https://www.anchorterminal.com/compare/claude-code-vs-letta.md)\n- [Claude Code vs Orca](https://www.anchorterminal.com/compare/claude-code-vs-orca.md)\n- [Cline vs Letta](https://www.anchorterminal.com/compare/cline-vs-letta.md)\n- [Cline vs Orca](https://www.anchorterminal.com/compare/cline-vs-orca.md)\n- [Conductor vs Letta](https://www.anchorterminal.com/compare/conductor-vs-letta.md)\n- [Conductor vs Orca](https://www.anchorterminal.com/compare/conductor-vs-orca.md)\n- [Crush vs Letta](https://www.anchorterminal.com/compare/crush-vs-letta.md)\n- [Crush vs Orca](https://www.anchorterminal.com/compare/crush-vs-orca.md)\n- [Cursor CLI vs Letta](https://www.anchorterminal.com/compare/cursor-cli-vs-letta.md)\n- [Cursor CLI vs Orca](https://www.anchorterminal.com/compare/cursor-cli-vs-orca.md)\n- [DeepSeek Harness (dsh) vs Letta](https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.md)\n- [DeepSeek Harness (dsh) vs Orca](https://www.anchorterminal.com/compare/deepseek-harness-vs-orca.md)\n- [dsh-superagent (DeepSeek) vs Letta](https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta.md)\n- [dsh-superagent (DeepSeek) vs Orca](https://www.anchorterminal.com/compare/deepseek-superagent-vs-orca.md)\n- [Devin vs Letta](https://www.anchorterminal.com/compare/devin-vs-letta.md)\n- [Devin vs Orca](https://www.anchorterminal.com/compare/devin-vs-orca.md)\n- [Droid CLI vs Letta](https://www.anchorterminal.com/compare/droid-cli-vs-letta.md)\n- [Droid CLI vs Orca](https://www.anchorterminal.com/compare/droid-cli-vs-orca.md)\n- [Pi vs Letta](https://www.anchorterminal.com/compare/earendil-pi-vs-letta.md)\n- [Pi vs Orca](https://www.anchorterminal.com/compare/earendil-pi-vs-orca.md)\n- [Emdash vs Letta](https://www.anchorterminal.com/compare/emdash-vs-letta.md)\n- [Emdash vs Orca](https://www.anchorterminal.com/compare/emdash-vs-orca.md)\n- [Gemini CLI vs Letta](https://www.anchorterminal.com/compare/gemini-cli-vs-letta.md)\n- [Gemini CLI vs Orca](https://www.anchorterminal.com/compare/gemini-cli-vs-orca.md)\n- [GitHub Copilot CLI vs Letta](https://www.anchorterminal.com/compare/github-copilot-cli-vs-letta.md)\n- [GitHub Copilot CLI vs Orca](https://www.anchorterminal.com/compare/github-copilot-cli-vs-orca.md)\n- [goose vs Letta](https://www.anchorterminal.com/compare/goose-vs-letta.md)\n- [goose vs Orca](https://www.anchorterminal.com/compare/goose-vs-orca.md)\n- [Harness² vs Letta](https://www.anchorterminal.com/compare/harness2-vs-letta.md)\n- [Harness² vs Orca](https://www.anchorterminal.com/compare/harness2-vs-orca.md)\n- [HarnessRouter vs Letta](https://www.anchorterminal.com/compare/harnessrouter-vs-letta.md)\n- [HarnessRouter vs Orca](https://www.anchorterminal.com/compare/harnessrouter-vs-orca.md)\n- [Jules vs Letta](https://www.anchorterminal.com/compare/jules-vs-letta.md)\n- [Jules vs Orca](https://www.anchorterminal.com/compare/jules-vs-orca.md)\n- [Junie CLI vs Letta](https://www.anchorterminal.com/compare/junie-vs-letta.md)\n- [Junie CLI vs Orca](https://www.anchorterminal.com/compare/junie-vs-orca.md)\n- [Kilo Code CLI vs Letta](https://www.anchorterminal.com/compare/kilo-code-cli-vs-letta.md)\n- [Kilo Code CLI vs Orca](https://www.anchorterminal.com/compare/kilo-code-cli-vs-orca.md)\n- [Kimi Code CLI vs Letta](https://www.anchorterminal.com/compare/kimi-code-cli-vs-letta.md)\n- [Kimi Code CLI vs Orca](https://www.anchorterminal.com/compare/kimi-code-cli-vs-orca.md)\n- [Kiro CLI vs Letta](https://www.anchorterminal.com/compare/kiro-cli-vs-letta.md)\n- [Kiro CLI vs Orca](https://www.anchorterminal.com/compare/kiro-cli-vs-orca.md)\n- [Letta vs mini-swe-agent](https://www.anchorterminal.com/compare/letta-vs-mini-swe-agent.md)\n- [Letta vs MiniMax Code](https://www.anchorterminal.com/compare/letta-vs-minimax-code.md)\n- [Letta vs Mistral Vibe CLI](https://www.anchorterminal.com/compare/letta-vs-mistral-vibe-cli.md)\n- [Letta vs Muse Code](https://www.anchorterminal.com/compare/letta-vs-muse-code.md)\n- [Letta vs OpenAI Agents API](https://www.anchorterminal.com/compare/letta-vs-openai-agents-api.md)\n- [Letta vs OpenAI Codex](https://www.anchorterminal.com/compare/letta-vs-openai-codex.md)\n- [Letta vs OpenCode](https://www.anchorterminal.com/compare/letta-vs-opencode.md)\n- [Letta vs OpenHands](https://www.anchorterminal.com/compare/letta-vs-openhands.md)\n- [Letta vs OpenMausBot](https://www.anchorterminal.com/compare/letta-vs-openmausbot.md)\n- [Letta vs Paseo](https://www.anchorterminal.com/compare/letta-vs-paseo.md)\n- [Letta vs Prime Agent](https://www.anchorterminal.com/compare/letta-vs-prime-agent.md)\n- [Letta vs Qoder CLI](https://www.anchorterminal.com/compare/letta-vs-qoder-cli.md)\n- [Letta vs Qwen Code](https://www.anchorterminal.com/compare/letta-vs-qwen-code.md)\n- [Letta vs Mirror CLI](https://www.anchorterminal.com/compare/letta-vs-reflection-mirror.md)\n- [Letta vs Rovo Dev CLI](https://www.anchorterminal.com/compare/letta-vs-rovo-dev-cli.md)\n- [Letta vs Sculptor](https://www.anchorterminal.com/compare/letta-vs-sculptor.md)\n- [Letta vs T3 Code](https://www.anchorterminal.com/compare/letta-vs-t3-code.md)\n- [Letta vs Traycer](https://www.anchorterminal.com/compare/letta-vs-traycer.md)\n- [Letta vs Unstoppable](https://www.anchorterminal.com/compare/letta-vs-unstoppable.md)\n- [Letta vs Verdent](https://www.anchorterminal.com/compare/letta-vs-verdent.md)\n- [Letta vs Vibe-Trading](https://www.anchorterminal.com/compare/letta-vs-vibe-trading.md)\n- [Letta vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/letta-vs-warp.md)\n- [mini-swe-agent vs Orca](https://www.anchorterminal.com/compare/mini-swe-agent-vs-orca.md)\n- [MiniMax Code vs Orca](https://www.anchorterminal.com/compare/minimax-code-vs-orca.md)\n- [Mistral Vibe CLI vs Orca](https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-orca.md)\n- [Muse Code vs Orca](https://www.anchorterminal.com/compare/muse-code-vs-orca.md)\n- [OpenAI Agents API vs Orca](https://www.anchorterminal.com/compare/openai-agents-api-vs-orca.md)\n- [OpenAI Codex vs Orca](https://www.anchorterminal.com/compare/openai-codex-vs-orca.md)\n- [OpenCode vs Orca](https://www.anchorterminal.com/compare/opencode-vs-orca.md)\n- [OpenHands vs Orca](https://www.anchorterminal.com/compare/openhands-vs-orca.md)\n- [Orca vs Paseo](https://www.anchorterminal.com/compare/orca-vs-paseo.md)\n- [Orca vs Prime Agent](https://www.anchorterminal.com/compare/orca-vs-prime-agent.md)\n- [Orca vs Qoder CLI](https://www.anchorterminal.com/compare/orca-vs-qoder-cli.md)\n- [Orca vs Qwen Code](https://www.anchorterminal.com/compare/orca-vs-qwen-code.md)\n- [Orca vs Mirror CLI](https://www.anchorterminal.com/compare/orca-vs-reflection-mirror.md)\n- [Orca vs Rovo Dev CLI](https://www.anchorterminal.com/compare/orca-vs-rovo-dev-cli.md)\n- [Orca vs Sculptor](https://www.anchorterminal.com/compare/orca-vs-sculptor.md)\n- [Orca vs T3 Code](https://www.anchorterminal.com/compare/orca-vs-t3-code.md)\n- [Orca vs Traycer](https://www.anchorterminal.com/compare/orca-vs-traycer.md)\n- [Orca vs Unstoppable](https://www.anchorterminal.com/compare/orca-vs-unstoppable.md)\n- [Orca vs Verdent](https://www.anchorterminal.com/compare/orca-vs-verdent.md)\n- [Orca vs Vibe-Trading](https://www.anchorterminal.com/compare/orca-vs-vibe-trading.md)\n- [Orca vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/orca-vs-warp.md)\n- [Clawboo vs Letta](https://www.anchorterminal.com/compare/clawboo-vs-letta.md)\n- [Clawboo vs Orca](https://www.anchorterminal.com/compare/clawboo-vs-orca.md)\n- [CLI Manager vs Letta](https://www.anchorterminal.com/compare/cli-manager-vs-letta.md)\n- [CLI Manager vs Orca](https://www.anchorterminal.com/compare/cli-manager-vs-orca.md)\n- [Harness vs Letta](https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.md)\n- [Harness vs Orca](https://www.anchorterminal.com/compare/harness-autonomous-vs-orca.md)\n- [Letta vs Paperclip](https://www.anchorterminal.com/compare/letta-vs-paperclip.md)\n- [Letta vs Parallax](https://www.anchorterminal.com/compare/letta-vs-parallax-agents.md)\n- [OpenMausBot vs Orca](https://www.anchorterminal.com/compare/openmausbot-vs-orca.md)\n- [Orca vs Paperclip](https://www.anchorterminal.com/compare/orca-vs-paperclip.md)\n- [Orca vs Parallax](https://www.anchorterminal.com/compare/orca-vs-parallax-agents.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-07", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Letta vs Orca", "url": "" } ], "description": "Letta scores 59.7 (C) to Orca's 57.4 (C) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Letta C 59.7", "Orca C 57.4", "scores" ], "h1": "Letta vs Orca", "image": "https://www.anchorterminal.com/assets/og/default.png", "path": "/compare/letta-vs-orca", "published": "2026-10-01", "section": "tools", "title": "Letta vs Orca for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-11-07", "url": "https://www.anchorterminal.com/compare/letta-vs-orca" }, "tokens": { "markdown": 4700, "slim": 1380 }, "version": 1 }