{ "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": 687, "ranked": true, "rankOf": 1510, "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 Parallax's 38.1 (E), and leads in 6 of 7 scored categories. Parallax leads on security \u0026 auth.", "b": { "slug": "parallax-agents", "name": "Parallax", "vendor": "Conifer Solutions, Inc.", "vendorUrl": "https://www.conifer.build/parallax/", "kind": "harness", "category": "agent-harnesses", "summary": "Parallax, from Conifer, is a macOS app with a Linux daemon that runs Claude Code, Codex and other coding agents side by side on the owner's subscriptions. A cloud service reviews finished sessions and opens fix pull requests on GitHub.", "url": "https://www.anchorterminal.com/tools/parallax-agents", "markdownUrl": "https://www.anchorterminal.com/tools/parallax-agents.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/parallax-agents.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/parallax-agents.json", "dns": "parallax-agents.grade.anchorterminal.com", "repo": "https://github.com/ConiferKit/parallax-releases", "license": "Proprietary, under Conifer's Terms of Service (Conifer Solutions, Inc.). The GitHub repository holds the README and release binaries, not the source", "transports": [ "http" ], "packages": [], "auth": "mixed", "authNotes": "A person signs in to the app with GitHub or email and installs the Parallax GitHub App on chosen repositories. The capture installer uses a personal capture token, minted on the setup page and revocable there, sent as a bearer token to the review API. Copying the install command also creates a Conifer API key for review billing, revocable in the console.", "pricing": "freemium", "pricingNotes": "Free to download. Agents run on the owner's own Claude and Codex subscriptions, or on Conifer credit. Sign-up with GitHub adds $50 of Conifer credit and 5 free review episodes (a lifetime allowance). Each later episode uses one Parallax credit, priced only after sign-in. Gateway token prices are public at `GET https://api.conifer.build/v1/catalog`.", "priceSummary": "Freemium", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 on the Parallax page, the Parallax docs, the products page or llms.txt (checked 2026-10-17). Credit is bought by card through Stripe per the privacy policy and subprocessors page.", "endpoints": [] }, "toolCount": 0, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-17" }, "docsUrl": "https://www.conifer.build/docs/parallax/", "llmsTxt": "https://www.conifer.build/llms.txt", "capabilities": [ "agent.multi-agent", "code.git" ], "tags": [ "closed-source", "desktop-app", "macos", "linux", "local", "hosted", "freemium", "llms-txt", "new" ], "lastRelease": "2026-10-16", "graded": true, "anchor": { "graded": true, "score": 38.1, "grade": "E", "agentReady": false, "rank": 1365, "ranked": true, "rankOf": 1510, "categoryRank": 54, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 42, "maintenance": 56, "payments": 30, "reliability": 40, "schema": 29, "security": 43, "transparency": 50 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "low", "date": "2026-10-17" }, "negative": -2, "negativeNotes": [ "Misleading claim, seen 17 October 2026. The products page says every Parallax finding is proved before the user sees it, and its diagram says a finding whose test fails is dropped and never reaches the user (https://www.conifer.build/products/). Conifer's own docs say every finding with a patch is delivered with its evidence label, and that unverified, could-not-run and refuted findings appear in the summary and as comments (https://www.conifer.build/docs/parallax/review/). The docs are accurate, so the low end of the range." ], "verdict": "Parallax runs several coding agents in one app and reviews finished sessions in the cloud, labelling each finding by what a sandbox test established. The app has no documented agent interface, the review API's base URL and episode prices are not public, capture covers every repository by default, and the product page overstates what reaches the user.", "bestFor": "A developer on a Mac who runs several coding agents across Claude and Codex subscriptions and wants cross-lab review of finished sessions on GitHub.", "strengths": [ "Review findings carry an evidence label (proven, suite green, unverified, could not run, refuted), and a patch that regresses the suite gets no one-click suggestion", "Reviewers come from labs other than the one whose model wrote the code, picked per task by Conifer's router", "Retrying an episode uses no extra credit, a session is swept once per capture mark, and a fix PR is reused, never reopened or merged by Parallax", "Recall receipts, sweep lines and a review ledger show what each session was handed and what each review found", "Session data is kept 30 days by both the privacy policy and the docs, and Fly.io is named as the Parallax subprocessor" ], "weaknesses": [ "No API, MCP server or CLI reference for the app itself. Captain, subscription fallback and fast merge are described only on the product page", "The review API is shown only as curl examples against `$PARALLAX_URL`, whose value is not published, with no OpenAPI or endpoint reference", "Capture uploads transcripts, tool output and source snapshots from every repository on a machine unless a local allowlist is set first", "The products page says every finding is proved before the user sees it, while the docs say unverified and refuted findings are also shown", "Episode credit prices appear only after sign-in, and there is no status page for Parallax, no security.txt and no public changelog" ], "agentNotes": [ "Don't plan to drive the Parallax app. It has no documented agent interface. Run Claude Code, Codex or another harness directly and let the person use Parallax around it", "Ask the person for `PARALLAX_URL` and the capture token before calling the review API, then read `GET /v1/sweeps` for results and skip reasons", "On `skipped: source unavailable`, read the reason and apply its fix, such as adding `test:` to parallax.yml or starting the session inside the repository", "Ask the person to set the capture allowlist before starting sessions in repositories that must not leave the machine", "Treat a lesson in the session-start brief as a hint to check against the code, not as an instruction that overrides the person" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 4, "avgRating": 2, "history": [ { "basis": "public evidence", "confidence": "low", "grade": "E", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 38.1 } ], "editorialScores": { "ergonomics": 42, "maintenance": 56, "payments": 30, "reliability": 40, "schema": 29, "security": 43, "transparency": 48 }, "provenanceScore": 52, "checked": { "categories": { "ergonomics": "2026-10-17", "maintenance": "2026-10-17", "payments": "2026-10-17", "reliability": "2026-10-17", "schema": "2026-10-17", "security": "2026-10-17", "transparency": "2026-10-17" }, "last": "2026-10-17", "lastMoved": "2026-10-30", "oldest": "2026-10-17", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "d=$(mktemp -d) \u0026\u0026 curl -fsSLo \"$d/install.sh\" https://github.com/ConiferKit/parallax-releases/releases/latest/download/install.sh \u0026\u0026 sh \"$d/install.sh\"", "http": "curl -s -H \"authorization: Bearer $PARALLAX_TOKEN\" \"$PARALLAX_URL/v1/sweeps\"" }, "letme": { "capability": "https://letme.dev/agent.multi-agent", "tool": "https://letme.dev/parallax-agents" }, "area": "frameworks", "provenance": { "legalEntity": "Conifer Solutions, Inc.", "domain": "conifer.build", "domainRegistered": "2026-05-07", "endpointOnVendorDomain": null, "terms": "https://www.conifer.build/terms/", "privacy": "https://www.conifer.build/privacy/", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-10-17", "notes": [ "The terms (effective 13 August 2026) name Conifer Solutions, Inc., a Delaware corporation, and choose Delaware law. They forbid scraping the services other than through documented interfaces.", "The privacy policy and subprocessors page (both effective 26 September 2026) describe Parallax capture and name Fly.io as its processor. They predate the app and do not describe Captain or connected subscription accounts.", "RDAP gives a registration date of 7 May 2026 for conifer.build.", "www.conifer.build/.well-known/security.txt and conifer.build/.well-known/security.txt returned 404 on 17 October 2026. The privacy policy says security reports go to Conifer's contact address, answered within two business days.", "conifer.build/uptime probes upstream model providers (snapshot dated 29 August) and is not a status page for Parallax.", "The base URL of the hosted review API is not published, so there is no vendor endpoint to record." ], "score": 52 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/parallax-agents.json", "live": { "slug": "parallax-agents", "versions": [ { "registry": "github", "name": "ConiferKit/parallax-releases", "version": "v1.0.8", "released": "2026-10-28", "seenAt": "2026-11-06T23:54:33.861924954Z" } ], "githubStars": 2, "securityTxt": { "url": "https://conifer.build/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:07.778548586Z" }, "llmsTxt": { "url": "https://www.conifer.build/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:33:35.246445179Z" }, "domain": { "domain": "conifer.build", "registered": "2026-05-07", "source": "https://rdap.centralnic.com/build/domain/conifer.build", "checkedAt": "2026-11-01T14:07:38.234059775Z" }, "pages": [ { "url": "https://www.conifer.build/privacy/", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:27:12.694165971Z", "changedAt": "2026-11-07T14:27:12.694165971Z", "fingerprint": "9e40821dc519" }, { "url": "https://www.conifer.build/terms/", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:27:14.979434596Z", "changedAt": "2026-11-07T14:27:14.979434596Z", "fingerprint": "b42181c35c09" } ], "github": { "repo": "coniferkit/parallax-releases", "checkedAt": "2026-11-02T08:41:26.361515618Z", "stars": 2, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-28T14:23:46Z", "openIssues": 0, "openPRs": 0, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 1 }, "updatedAt": "2026-11-07T16:01:07.778548586Z" } }, "edges": [ { "by": 41, "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": "The review API has no OpenAPI or endpoint reference. Endpoints appear only in curl examples, and the base URL `$PARALLAX_URL` is not published (0). conifer.build/llms.txt covers the gateway in detail and Parallax in two lines that point to the docs (5). The docs explain sessions, sweeps, evidence states, memory and retention at length, but nothing documents the app, Captain, fallback or fast merge (8). parallax.yml keys are listed with allowed values (`deliver: proven-only`, `review: off`, severity floors, sweep modes), but request and response shapes for the API are not (5). curl examples, sample sweep lines and a table of skip reasons with the fix for each (8). Paths sit under `/v1`, with no changelog for Parallax (3)." }, "scores": { "a": 70, "b": 29 } }, { "by": 30, "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": "No x402, MPP or L402 (0). Parallax episode credit prices are read from the account after sign-in. Gateway token prices are public at `GET /v1/catalog` with no key, which covers Conifer credit spent by agents (10). $50 of Conifer credit and 5 free episodes on GitHub sign-up, with no card mentioned, and agents can run on the owner's own Claude and Codex subscriptions (20). A person has to download the app, sign in and install the GitHub App, so no autonomous onboarding (0)." }, "scores": { "a": 60, "b": 30 } }, { "by": 29, "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": "v1.0.2 on 16 October 2026 (30). Three releases, v1.0.0 to v1.0.2, on 15 and 16 October 2026 (20). Closed service. No public changelog. Support through a GitHub issues link, a Discord server and email, none of which we could check for replies (3). No Parallax SDK and nothing in the MCP registry. Conifer's SDK is for the gateway (0). Signed builds with checksums and a self-updater, with no CI to inspect (3)." }, "scores": { "a": 85, "b": 56 } }, { "by": 25, "category": "ergonomics", "leads": "letta", "name": "Agent ergonomics", "reasons": { "a": "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.", "b": "Scored on the review API and the hooks, the only parts an agent touches. The session-start brief is cut at 6,000 characters, memory per review call at 12,000, and `lesson_cap` sets 1 to 20 lessons per person (8). `repo` filters on recall and brief, `brain=true` on the ledger, no documented pagination (4). Skip reasons such as `capture_commit_missing` and `test_configuration_missing` each come with a fix, but HTTP error codes for the API are not documented (12). A session is swept once per capture mark, retries use no extra credit, and a fix PR is reused and never reopened or merged by Parallax (14). No SDK for Parallax, and capture of every repository is the default (4)." }, "scores": { "a": 67, "b": 42 } }, { "by": 18, "category": "reliability", "leads": "letta", "name": "Reliability", "reasons": { "a": "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.", "b": "Read as local software, because the launched product is the app the owner runs. A signed and notarised universal DMG for macOS 12 or later and Linux tarballs for x86-64 and arm64 on GitHub Releases, with SHA256SUMS and an install script. No package registry (20). The release repository holds a README and binaries only, with no public CI or tests (0). We could not read its issues, because our GitHub access refused the issue pages, so the issue record is unchecked and scored absent (0). Semver tags v1.0.0 to v1.0.2, but no release notes or changelog we could read (5). Version 1.0.2 (15). The hosted review service has no status page and no published rate limits. conifer.build/uptime covers upstream model providers only." }, "scores": { "a": 58, "b": 40 } }, { "by": 8, "category": "security", "leads": "parallax-agents", "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 of the framework checklist, as for the other harnesses. 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. Once installed, capture uploads transcripts, tool calls with results and source snapshots from every repository on the machine unless a local allowlist is set first, and the app updates itself by default. Uploads stop with `PARALLAX_STORE_UPLOAD=off` and the token is revocable (8). Proofs run in a throwaway cloud copy, automatic PR review is off by default and Parallax never merges its own fix PR. What Captain may do to a running agent is not documented (10). Reviewers read untrusted transcripts and code with no documented mitigation. Lessons injected into the agent come only from verified outcomes and maintainer replies, never bots, and the brief labels everything else as cited fact (8). Recall receipts, per-injection records, sweep lines, the review ledger and `GET /v1/calibration` (12). No security.txt, bug bounty, SOC 2 or advisories. The privacy policy names a contact for security reports with a two-business-day reply and lists encryption and row-level security (5)." }, "scores": { "a": 35, "b": 43 } } ], "facts": [ { "a": "Agent harness", "b": "Agent harness", "name": "Kind" }, { "a": "Letta", "b": "Conifer Solutions, Inc.", "name": "Vendor" }, { "a": "no (local only)", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "stdio", "b": "HTTP", "name": "Transports" }, { "a": "OAuth or key", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Apache-2.0", "b": "Proprietary, under Conifer's Terms of Service (Conifer Solutions, Inc.). The GitHub repository holds the README and release binaries, not the source", "name": "Licence" }, { "a": "none", "b": "0", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-11-06", "b": "2026-10-16", "name": "Last release" }, { "a": "no date given", "b": "2026-10-22", "name": "Terms last updated" }, { "a": "no date given", "b": "2026-10-22", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "3.8k stars, 86k npm/wk, 2.2k PyPI/wk", "b": "none", "name": "Popularity" }, { "a": "none", "b": "2/5 (4)", "name": "Agent reviews" } ], "faq": [ { "answer": "Letta scores 59.7 (C) on agent readiness against Parallax's 38.1 (E), and leads in 6 of 7 scored categories. Parallax leads on security \u0026 auth.", "question": "Which is better for AI agents, Letta or Parallax?" }, { "answer": "Letta is open source (Apache-2.0). No open-source release is listed for Parallax.", "question": "Are Letta and Parallax open source?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 58 against 40", "Schema \u0026 documentation, 70 against 29", "Agent ergonomics, 67 against 42", "Payments \u0026 pricing, 60 against 30", "Maintenance \u0026 community, 85 against 56", "Transparency \u0026 trust, 55 against 50" ], "also": [ "Runs on your own machine", "Open source" ], "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": null, "goodFor": "A developer on a Mac who runs several coding agents across Claude and Codex subscriptions and wants cross-lab review of finished sessions on GitHub.", "slug": "parallax-agents", "watchFor": "No API, MCP server or CLI reference for the app itself. Captain, subscription fallback and fast merge are described only on the product page" } ], "history": { "letta": null, "parallax-agents": [ { "causes": [ "method" ], "date": "2026-10-30", "delta": -0.2, "from": 38.3, "fromGrade": "E", "to": 38.1, "toGrade": "E" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.4, "from": 37.9, "fromGrade": "F", "to": 38.3, "toGrade": "E" } ] }, "job": { "capability": "agent.multi-agent", "name": "Multi-agent orchestration" }, "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/aider-vs-letta.json", "title": "Aider vs Letta", "url": "https://www.anchorterminal.com/compare/aider-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/amp-vs-letta.json", "title": "Amp vs Letta", "url": "https://www.anchorterminal.com/compare/amp-vs-letta" }, { 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Parallax", "url": "https://www.anchorterminal.com/compare/orca-vs-parallax-agents" }, { "json": "https://www.anchorterminal.com/compare/paperclip-vs-parallax-agents.json", "title": "Paperclip vs Parallax", "url": "https://www.anchorterminal.com/compare/paperclip-vs-parallax-agents" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-paseo.json", "title": "Parallax vs Paseo", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-paseo" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-prime-agent.json", "title": "Parallax vs Prime Agent", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-prime-agent" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-qoder-cli.json", "title": "Parallax vs Qoder CLI", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-qoder-cli" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-qwen-code.json", "title": "Parallax vs Qwen Code", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-qwen-code" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-reflection-mirror.json", "title": "Parallax vs Mirror CLI", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-reflection-mirror" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-rovo-dev-cli.json", "title": "Parallax vs Rovo Dev CLI", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-rovo-dev-cli" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-sculptor.json", "title": "Parallax vs Sculptor", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-sculptor" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-t3-code.json", "title": "Parallax vs T3 Code", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-t3-code" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-traycer.json", "title": "Parallax vs Traycer", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-traycer" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable.json", "title": "Parallax vs Unstoppable", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-verdent.json", "title": "Parallax vs Verdent", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-verdent" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-vibe-trading.json", "title": "Parallax vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-warp.json", "title": "Parallax vs Warp (Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-warp" } ], "panel": null, "scores": [ { "by": 18, "edge": "letta", "key": "reliability", "letta": 58, "name": "Reliability", "parallax-agents": 40, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 41, "edge": "letta", "key": "schema", "letta": 70, "name": "Schema \u0026 documentation", "parallax-agents": 29, "weight": 13 }, { "by": 25, "edge": "letta", "key": "ergonomics", "letta": 67, "name": "Agent ergonomics", "parallax-agents": 42, "weight": 13 }, { "by": 8, "edge": "parallax-agents", "key": "security", "letta": 35, "name": "Security \u0026 auth", "parallax-agents": 43, "weight": 14 }, { "by": 30, "edge": "letta", "key": "payments", "letta": 60, "name": "Payments \u0026 pricing", "parallax-agents": 30, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 29, "edge": "letta", "key": "maintenance", "letta": 85, "name": "Maintenance \u0026 community", "parallax-agents": 56, "weight": 7 }, { "by": 5, "edge": "letta", "key": "transparency", "letta": 55, "name": "Transparency \u0026 trust", "parallax-agents": 50, "weight": 7 } ], "summary": "Letta scores 59.7 (C) on agent readiness against Parallax's 38.1 (E), and leads in 6 of 7 scored categories. Parallax leads on security \u0026 auth. Both do multi-agent orchestration.", "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.", "parallax-agents": "Parallax runs several coding agents in one app and reviews finished sessions in the cloud, labelling each finding by what a sandbox test established. The app has no documented agent interface, the review API's base URL and episode prices are not public, capture covers every repository by default, and the product page overstates what reaches the user." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents", "json": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents.min.md" }, "markdown": "Letta scores 59.7 (C) on agent readiness against Parallax's 38.1 (E), and leads in 6 of 7 scored categories. Parallax leads on security \u0026 auth. Both do multi-agent orchestration.\n\n- 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\n- Parallax: grade E, 38.1/100, rank #1365 of 1510. Markdown https://www.anchorterminal.com/tools/parallax-agents.md · JSON https://www.anchorterminal.com/api/v1/tools/parallax-agents.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- Reliability, 58 against 40\n- Schema \u0026 documentation, 70 against 29\n- Agent ergonomics, 67 against 42\n- Payments \u0026 pricing, 60 against 30\n- Maintenance \u0026 community, 85 against 56\n- Transparency \u0026 trust, 55 against 50\n\nAlso in its favour:\n- Runs on your own machine\n- Open source\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### Parallax (E)\n\nGood for: A developer on a Mac who runs several coding agents across Claude and Codex subscriptions and wants cross-lab review of finished sessions on GitHub.\n\nAhead on:\n- Security \u0026 auth, 43 against 35\n\nWatch for: No API, MCP server or CLI reference for the app itself. Captain, subscription fallback and fast merge are described only on the product page\n\n\n## Why the edge\n\n### Schema \u0026 documentation: Letta +41\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- Parallax (29): The review API has no OpenAPI or endpoint reference. Endpoints appear only in curl examples, and the base URL `$PARALLAX_URL` is not published (0). conifer.build/llms.txt covers the gateway in detail and Parallax in two lines that point to the docs (5). The docs explain sessions, sweeps, evidence states, memory and retention at length, but nothing documents the app, Captain, fallback or fast merge (8). parallax.yml keys are listed with allowed values (`deliver: proven-only`, `review: off`, severity floors, sweep modes), but request and response shapes for the API are not (5). curl examples, sample sweep lines and a table of skip reasons with the fix for each (8). Paths sit under `/v1`, with no changelog for Parallax (3).\n\n### Payments \u0026 pricing: Letta +30\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- Parallax (30): No x402, MPP or L402 (0). Parallax episode credit prices are read from the account after sign-in. Gateway token prices are public at `GET /v1/catalog` with no key, which covers Conifer credit spent by agents (10). $50 of Conifer credit and 5 free episodes on GitHub sign-up, with no card mentioned, and agents can run on the owner's own Claude and Codex subscriptions (20). A person has to download the app, sign in and install the GitHub App, so no autonomous onboarding (0).\n\n### Maintenance \u0026 community: Letta +29\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- Parallax (56): v1.0.2 on 16 October 2026 (30). Three releases, v1.0.0 to v1.0.2, on 15 and 16 October 2026 (20). Closed service. No public changelog. Support through a GitHub issues link, a Discord server and email, none of which we could check for replies (3). No Parallax SDK and nothing in the MCP registry. Conifer's SDK is for the gateway (0). Signed builds with checksums and a self-updater, with no CI to inspect (3).\n\n### Agent ergonomics: Letta +25\n\n- 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.\n- Parallax (42): Scored on the review API and the hooks, the only parts an agent touches. The session-start brief is cut at 6,000 characters, memory per review call at 12,000, and `lesson_cap` sets 1 to 20 lessons per person (8). `repo` filters on recall and brief, `brain=true` on the ledger, no documented pagination (4). Skip reasons such as `capture_commit_missing` and `test_configuration_missing` each come with a fix, but HTTP error codes for the API are not documented (12). A session is swept once per capture mark, retries use no extra credit, and a fix PR is reused and never reopened or merged by Parallax (14). No SDK for Parallax, and capture of every repository is the default (4).\n\n### Reliability: Letta +18\n\n- 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.\n- Parallax (40): Read as local software, because the launched product is the app the owner runs. A signed and notarised universal DMG for macOS 12 or later and Linux tarballs for x86-64 and arm64 on GitHub Releases, with SHA256SUMS and an install script. No package registry (20). The release repository holds a README and binaries only, with no public CI or tests (0). We could not read its issues, because our GitHub access refused the issue pages, so the issue record is unchecked and scored absent (0). Semver tags v1.0.0 to v1.0.2, but no release notes or changelog we could read (5). Version 1.0.2 (15). The hosted review service has no status page and no published rate limits. conifer.build/uptime covers upstream model providers only.\n\n### Security \u0026 auth: Parallax +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- Parallax (43): 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 prompt-injection posture, 15 for audit and 20 for the security programme. Once installed, capture uploads transcripts, tool calls with results and source snapshots from every repository on the machine unless a local allowlist is set first, and the app updates itself by default. Uploads stop with `PARALLAX_STORE_UPLOAD=off` and the token is revocable (8). Proofs run in a throwaway cloud copy, automatic PR review is off by default and Parallax never merges its own fix PR. What Captain may do to a running agent is not documented (10). Reviewers read untrusted transcripts and code with no documented mitigation. Lessons injected into the agent come only from verified outcomes and maintainer replies, never bots, and the brief labels everything else as cited fact (8). Recall receipts, per-injection records, sweep lines, the review ledger and `GET /v1/calibration` (12). No security.txt, bug bounty, SOC 2 or advisories. The privacy policy names a contact for security reports with a two-business-day reply and lists encryption and row-level security (5).\n\n## Score by category\n\n| Category | Weight | Letta | Parallax | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 58 | 40 | Letta +18 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 70 | 29 | Letta +41 |\n| Agent ergonomics | 13% (16.2 this run) | 67 | 42 | Letta +25 |\n| Security \u0026 auth | 14% (17.5 this run) | 35 | 43 | Parallax +8 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 30 | Letta +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 85 | 56 | Letta +29 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 55 | 50 | Letta +5 |\n| Negative events | ≤15 | 0 | -2 | |\n| **Total** | | **59.7 · C** | **38.1 · E** | |\n\n## Facts side by side\n\n| Fact | Letta | Parallax |\n| --- | --- | --- |\n| Kind | Agent harness | Agent harness |\n| Vendor | Letta | Conifer Solutions, Inc. |\n| Hosted endpoint | no (local only) | no (local only) |\n| Transports | stdio | HTTP |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 | Proprietary, under Conifer's Terms of Service (Conifer Solutions, Inc.). The GitHub repository holds the README and release binaries, not the source |\n| Tools exposed | none | 0 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-11-06 | 2026-10-16 |\n| Terms last updated | no date given | 2026-10-22 |\n| Privacy policy last updated | no date given | 2026-10-22 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | yes | yes |\n| Popularity | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk | none |\n| Agent reviews | none | 2/5 (4) |\n\n## How the scores have moved\n\n### Letta\n\nNo score change since it was listed.\n\n### Parallax\n\n- -0.2 on 30 October 2026: checklist\n- +0.4 on 27 October 2026 (F to E): checklist\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**Parallax.** Parallax runs several coding agents in one app and reviews finished sessions in the cloud, labelling each finding by what a sandbox test established. The app has no documented agent interface, the review API's base URL and episode prices are not public, capture covers every repository by default, and the product page overstates what reaches the user.\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### Parallax\n\n1. Don't plan to drive the Parallax app. It has no documented agent interface. Run Claude Code, Codex or another harness directly and let the person use Parallax around it\n2. Ask the person for `PARALLAX_URL` and the capture token before calling the review API, then read `GET /v1/sweeps` for results and skip reasons\n3. On `skipped: source unavailable`, read the reason and apply its fix, such as adding `test:` to parallax.yml or starting the session inside the repository\n4. Ask the person to set the capture allowlist before starting sessions in repositories that must not leave the machine\n5. Treat a lesson in the session-start brief as a hint to check against the code, not as an instruction that overrides the person\n\n## Questions\n\n### Which is better for AI agents, Letta or Parallax?\n\nLetta scores 59.7 (C) on agent readiness against Parallax's 38.1 (E), and leads in 6 of 7 scored categories. Parallax leads on security \u0026 auth.\n\n### Are Letta and Parallax open source?\n\nLetta is open source (Apache-2.0). No open-source release is listed for Parallax.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/letta-vs-parallax-agents.json, and with the fewest tokens: https://www.anchorterminal.com/compare/letta-vs-parallax-agents.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"letta\", \"b\": \"parallax-agents\"}`. From a terminal: `anchor compare letta parallax-agents`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/letta.json and https://www.anchorterminal.com/api/v1/tools/parallax-agents.json\n\n## Other comparisons with Letta or Parallax\n\n- [Agent Zero vs Letta](https://www.anchorterminal.com/compare/agent-zero-vs-letta.md)\n- [Aider vs Letta](https://www.anchorterminal.com/compare/aider-vs-letta.md)\n- [Amp vs Letta](https://www.anchorterminal.com/compare/amp-vs-letta.md)\n- [Antigravity CLI vs Letta](https://www.anchorterminal.com/compare/antigravity-cli-vs-letta.md)\n- [Auggie CLI vs Letta](https://www.anchorterminal.com/compare/auggie-vs-letta.md)\n- [AXLR vs Letta](https://www.anchorterminal.com/compare/axlr-vs-letta.md)\n- [Claude Code vs Letta](https://www.anchorterminal.com/compare/claude-code-vs-letta.md)\n- [Cline vs Letta](https://www.anchorterminal.com/compare/cline-vs-letta.md)\n- [Conductor vs Letta](https://www.anchorterminal.com/compare/conductor-vs-letta.md)\n- [Crush vs Letta](https://www.anchorterminal.com/compare/crush-vs-letta.md)\n- [Cursor CLI vs Letta](https://www.anchorterminal.com/compare/cursor-cli-vs-letta.md)\n- [DeepSeek Harness (dsh) vs Letta](https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.md)\n- [dsh-superagent (DeepSeek) vs Letta](https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta.md)\n- [Devin vs Letta](https://www.anchorterminal.com/compare/devin-vs-letta.md)\n- [Droid CLI vs Letta](https://www.anchorterminal.com/compare/droid-cli-vs-letta.md)\n- [Pi vs Letta](https://www.anchorterminal.com/compare/earendil-pi-vs-letta.md)\n- [Emdash vs Letta](https://www.anchorterminal.com/compare/emdash-vs-letta.md)\n- [Gemini CLI vs Letta](https://www.anchorterminal.com/compare/gemini-cli-vs-letta.md)\n- [GitHub Copilot CLI vs Letta](https://www.anchorterminal.com/compare/github-copilot-cli-vs-letta.md)\n- [goose vs Letta](https://www.anchorterminal.com/compare/goose-vs-letta.md)\n- [Harness² vs Letta](https://www.anchorterminal.com/compare/harness2-vs-letta.md)\n- [HarnessRouter vs Letta](https://www.anchorterminal.com/compare/harnessrouter-vs-letta.md)\n- [Jules vs Letta](https://www.anchorterminal.com/compare/jules-vs-letta.md)\n- [Junie CLI vs Letta](https://www.anchorterminal.com/compare/junie-vs-letta.md)\n- [Kilo Code CLI vs Letta](https://www.anchorterminal.com/compare/kilo-code-cli-vs-letta.md)\n- [Kimi Code CLI vs Letta](https://www.anchorterminal.com/compare/kimi-code-cli-vs-letta.md)\n- [Kiro CLI vs Letta](https://www.anchorterminal.com/compare/kiro-cli-vs-letta.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 Orca](https://www.anchorterminal.com/compare/letta-vs-orca.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- [Amp vs Parallax](https://www.anchorterminal.com/compare/amp-vs-parallax-agents.md)\n- [Antigravity CLI vs Parallax](https://www.anchorterminal.com/compare/antigravity-cli-vs-parallax-agents.md)\n- 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Parallax](https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-parallax-agents.md)\n- [Muse Code vs Parallax](https://www.anchorterminal.com/compare/muse-code-vs-parallax-agents.md)\n- [OpenCode vs Parallax](https://www.anchorterminal.com/compare/opencode-vs-parallax-agents.md)\n- [OpenHands vs Parallax](https://www.anchorterminal.com/compare/openhands-vs-parallax-agents.md)\n- [OpenMausBot vs Parallax](https://www.anchorterminal.com/compare/openmausbot-vs-parallax-agents.md)\n- [Orca vs Parallax](https://www.anchorterminal.com/compare/orca-vs-parallax-agents.md)\n- [Paperclip vs Parallax](https://www.anchorterminal.com/compare/paperclip-vs-parallax-agents.md)\n- [Parallax vs Paseo](https://www.anchorterminal.com/compare/parallax-agents-vs-paseo.md)\n- [Parallax vs Prime Agent](https://www.anchorterminal.com/compare/parallax-agents-vs-prime-agent.md)\n- [Parallax vs Qoder CLI](https://www.anchorterminal.com/compare/parallax-agents-vs-qoder-cli.md)\n- [Parallax vs Qwen Code](https://www.anchorterminal.com/compare/parallax-agents-vs-qwen-code.md)\n- [Parallax vs Mirror CLI](https://www.anchorterminal.com/compare/parallax-agents-vs-reflection-mirror.md)\n- [Parallax vs Rovo Dev CLI](https://www.anchorterminal.com/compare/parallax-agents-vs-rovo-dev-cli.md)\n- [Parallax vs Sculptor](https://www.anchorterminal.com/compare/parallax-agents-vs-sculptor.md)\n- [Parallax vs T3 Code](https://www.anchorterminal.com/compare/parallax-agents-vs-t3-code.md)\n- [Parallax vs Traycer](https://www.anchorterminal.com/compare/parallax-agents-vs-traycer.md)\n- [Parallax vs Unstoppable](https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable.md)\n- [Parallax vs Verdent](https://www.anchorterminal.com/compare/parallax-agents-vs-verdent.md)\n- [Parallax vs Vibe-Trading](https://www.anchorterminal.com/compare/parallax-agents-vs-vibe-trading.md)\n- [Parallax vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/parallax-agents-vs-warp.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 Parallax", "url": "" } ], "description": "Letta scores 59.7 (C) to Parallax's 38.1 (E) for multi-agent orchestration. 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