{ "data": { "a": { "slug": "jules", "name": "Jules", "vendor": "Google LLC", "vendorUrl": "https://jules.google", "kind": "harness", "category": "agent-harnesses", "summary": "Jules is Google's asynchronous coding agent, which clones a GitHub repository into a cloud virtual machine, plans, edits and opens pull requests. Outside agents drive it through an alpha REST API, a TypeScript SDK, an MCP package and a CLI.", "url": "https://www.anchorterminal.com/tools/jules", "markdownUrl": "https://www.anchorterminal.com/tools/jules.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/jules.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/jules.json", "dns": "jules.grade.anchorterminal.com", "repo": "https://github.com/google-labs-code/jules-sdk", "license": "Proprietary service under the Google Terms of Service. The TypeScript SDK is Apache-2.0; the CLI binary is closed", "transports": [ "http", "stdio" ], "packages": [ { "registry": "npm", "name": "@google/jules" }, { "registry": "npm", "name": "@google/jules-sdk" }, { "registry": "npm", "name": "@google/jules-mcp" } ], "auth": "mixed", "authNotes": "The REST API takes an API key in the `X-Goog-Api-Key` header. Keys are created by a person in Settings in the Jules web app, at most three at a time, shown once and revocable there, and publicly exposed keys are disabled automatically. Keys carry no scopes. The discovery document also lists Google OAuth with the broad cloud-platform scope. The Jules Tools CLI signs in with a Google account in the browser (`jules login`). Repository sources need the Jules GitHub app installed through the web app.", "pricing": "freemium", "pricingNotes": "Free plan with 15 tasks a day and 3 concurrent tasks. Jules in Pro (100 a day, 15 concurrent) and Jules in Ultra (300 a day, 60 concurrent) come with the Google AI Pro and Ultra plans, and the Google AI plans page lists AI Plus with expanded Jules limits (jules.google/docs/usage-limits and one.google.com/about/google-ai-plans, checked 2026-10-18). Paid plans are for personal @gmail.com accounts, with an interest form for business users. The plan prices render per locale and weren't read. No per-task or per-call price.", "priceSummary": "Freemium", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the Jules docs, the API reference, the discovery document or the plans pages (checked 2026-10-18).", "endpoints": [] }, "toolCount": 8, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-05" }, "docsUrl": "https://jules.google/docs/", "llmsTxt": "https://jules.google/docs/llms.txt", "openapi": "https://jules.googleapis.com/$discovery/rest?version=v1alpha", "capabilities": [ "agent.harness", "agent.mcp-client", "agent.multi-agent" ], "tags": [ "official", "hosted", "cloud-agent", "closed-source", "api-key", "alpha", "llms-txt", "mcp", "no-status-page", "stale-release", "freemium" ], "lastRelease": "2026-03-09", "graded": true, "anchor": { "graded": true, "score": 45.1, "grade": "E", "agentReady": false, "rank": 1187, "ranked": true, "rankOf": 1486, "categoryRank": 48, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 64, "maintenance": 18, "payments": 30, "reliability": 13, "schema": 76, "security": 57, "transparency": 51 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-05" }, "negative": 0, "verdict": "Google is winding Jules down. Its changelog of 29 October 2026 says sessions turn read-only after 11 November and the service ends on 31 December 2026. Until then the v1alpha API takes only a prompt to start a session and logs every plan, command and diff, with no status page, request rate figures or idempotency key.", "bestFor": "Nobody starting new work, since Jules turns read-only after 11 November 2026 and ends on 31 December 2026.", "strengths": [ "Public discovery document for jules.googleapis.com v1alpha with 13 methods, typed schemas, enums and required fields, revision 20261015", "Only `prompt` is required to create a session. A session without `sourceContext` runs repoless in a fresh cloud VM", "Activities record plans, messages, bash commands with exit codes and git patches, and can be filtered by `create_time` to fetch only new events", "The wind-down notice gives dated steps and an export of settings, memories and every session through the Jules Tools CLI", "Free plan of 15 tasks a day and 3 concurrent tasks with a Google account, and docs served as Markdown with an llms.txt index" ], "weaknesses": [ "Jules turns read-only after 11 November 2026 and winds down on 31 December 2026, per the changelog of 29 October", "The REST API has been v1alpha since 3 October 2025, and before the wind-down notice the newest changelog entry was 9 March 2026", "No status page, no request rate figures, no Retry-After guidance and no idempotency key on session creation were found", "API sessions auto-approve their plans unless `requirePlanApproval` is true, and the MCP server defaults to an automated run that opens a pull request", "A person must sign in with Google, install the Jules GitHub app and create the key in the web app. Keys carry no scopes" ], "agentNotes": [ "Don't start new work on Jules. Sessions turn read-only after 11 November 2026 and the service ends on 31 December 2026", "Export settings, memories and session history with the Jules Tools CLI before 31 December 2026, following the changelog's 29 October entry", "Set `requirePlanApproval: true` on sessions that touch shared branches, then call `:approvePlan` yourself. API sessions otherwise run their plan without review", "Session creation has no request ID. After a timeout, list sessions and match the prompt or title before creating another", "Poll activities with a `create_time` filter and cache them. Activities never change once written" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 4, "avgRating": 2.8, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "E", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 45.1 } ], "editorialScores": { "ergonomics": 64, "maintenance": 18, "payments": 30, "reliability": 13, "schema": 76, "security": 57, "transparency": 35 }, "provenanceScore": 67, "checked": { "categories": { "ergonomics": "2026-11-05", "maintenance": "2026-11-05", "payments": "2026-11-05", "reliability": "2026-11-05", "schema": "2026-11-05", "security": "2026-11-05", "transparency": "2026-11-05" }, "last": "2026-11-05", "lastMoved": "2026-11-05", "oldest": "2026-11-05", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "npm install -g @google/jules # Jules Tools CLI, then: jules login", "http": "curl 'https://jules.googleapis.com/v1alpha/sessions' -X POST -H \"Content-Type: application/json\" -H \"x-goog-api-key: $JULES_API_KEY\" -d '{\"prompt\": \"Add a test for parseQueryString in utils.js\", \"sourceContext\": {\"source\": \"sources/github/OWNER/REPO\", \"githubRepoContext\": {\"startingBranch\": \"main\"}}, \"requirePlanApproval\": true}'", "config": { "mcpServers": { "jules": { "args": [ "@google/jules-mcp" ], "command": "npx", "env": { "JULES_API_KEY": "\u003capi-key\u003e" } } } }, "headless": { "run": "jules remote new --repo . --session \"write unit tests\"" } }, "letme": { "capability": "https://letme.dev/agent.harness", "tool": "https://letme.dev/jules" }, "area": "frameworks", "provenance": { "legalEntity": "Google LLC", "domain": "jules.google", "domainRegistered": "2025-01-16", "endpointOnVendorDomain": true, "terms": "https://policies.google.com/terms", "privacy": "https://policies.google.com/privacy", "statusPage": "", "changelog": "https://jules.google/docs/changelog/", "securityTxt": "none", "checked": "2026-11-05", "notes": [ "The jules.google footer links the Google Terms of Service (effective 30 July 2026) and Privacy Policy. The terms bar automated access only where it ignores robots.txt, and jules.google answers robots.txt with a 404. The Jules privacy notice at jules.google.com/legal answered 'Jules is not yet available in your region' on 18 October and wasn't read.", "jules.google returns 404 for /.well-known/security.txt. www.google.com has a valid security.txt (expires 2030-04-01) pointing to g.co/vulnz and the Google VRP.", "The API answers at jules.googleapis.com, Google's API domain.", "No status page for Jules was found. The changelog of 29 October 2026 says Jules turns read-only after 11 November and winds down on 31 December 2026." ], "score": 67 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/jules.json", "live": { "slug": "jules", "versions": [ { "registry": "github", "name": "google-labs-code/jules-sdk", "version": "0.0.4", "released": "2026-02-03", "seenAt": "2026-11-06T23:36:06.708612278Z" }, { "registry": "npm", "name": "@google/jules", "version": "0.1.42", "seenAt": "2026-11-06T23:36:02.386342184Z" }, { "registry": "npm", "name": "@google/jules-mcp", "version": "0.2.0", "seenAt": "2026-11-06T23:36:04.582155979Z" }, { "registry": "npm", "name": "@google/jules-sdk", "version": "0.2.0", "seenAt": "2026-11-06T23:36:02.658855438Z" } ], "githubStars": 140, "npmWeekly": 2090, "securityTxt": { "url": "https://jules.google/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:45.078893576Z" }, "llmsTxt": { "url": "https://jules.google/docs/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:48.094578786Z" }, "domain": { "domain": "jules.google", "registered": "2025-01-16", "source": "https://pubapi.registry.google/rdap/domain/jules.google", "checkedAt": "2026-11-01T14:18:24.278305982Z" }, "pages": [ { "url": "https://jules.google/docs/changelog/", "kind": "deprecations", "status": 304, "checkedAt": "2026-11-07T14:11:49.410107672Z", "changedAt": "2026-10-30T05:41:50.628011713Z", "fingerprint": "e5e732f35aa5" } ], "github": { "repo": "google-labs-code/jules-sdk", "checkedAt": "2026-11-02T08:51:46.472092041Z", "stars": 139, "archived": false, "issuesEnabled": true, "pushedAt": "2026-07-23T17:46:04Z", "openIssues": 5, "openPRs": 6, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 0, "replies": { "sampled": 25, "unanswered": 5, "medianDays": 0.4 } }, "updatedAt": "2026-11-07T16:01:45.078893576Z" } }, "answer": "Letta scores 59.7 (C) on agent readiness against Jules's 45.1 (E), and leads in 5 of 7 scored categories. Jules leads on schema \u0026 documentation and security \u0026 auth.", "b": { "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" } }, "edges": [ { "by": 67, "category": "maintenance", "leads": "letta", "name": "Maintenance \u0026 community", "reasons": { "a": "Closed service. The newest API or product change is the changelog entry of 9 March 2026, 241 days before 5 November (0). The changelog's 29 October 2026 entry announces the wind-down and an export route through the CLI, which is a notice, not an API change. No package releases, commits or tags in the 90 days, and the jules-sdk repository's last commit is 18 March 2026 (0). A public changelog and a Discord channel. The 18 October issue and pull request counts came from shields.io badges and are struck (8 of 15, a partial held). The official TypeScript SDK and MCP packages last published 0.2.0 on 9 March 2026, per the 18 October registry reading, and no official MCP registry entry could be read (5). The SDK has a CI workflow on pull requests whose results couldn't be read, and two runtime dependencies. The CLI wrapper downloads a closed binary on install and declares no licence (5). 0 + 0 + 8 + 5 + 5 = 18.", "b": "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." }, "scores": { "a": 18, "b": 85 } }, { "by": 45, "category": "reliability", "leads": "letta", "name": "Reliability", "reasons": { "a": "Hosted reading. No status page for Jules was found (0). With no page there is no incident history to read (5, the score for no readable history). The plans page, re-read on 5 November, publishes task quotas with numbers, 15, 100 and 300 tasks a rolling 24 hours and 3, 15 and 60 concurrent, and list `pageSize` is capped at 100, but no request rate figures were found (8 of 15). 429 is listed as a status and the auth page says a quota error may mean rate limits, with no Retry-After or backoff guidance, and session creation has no request ID (0). No SLA found (0). The API is v1alpha and labelled experimental, and the changelog of 29 October 2026 says Jules turns read-only after 11 November (0). 0 + 5 + 8 + 0 + 0 + 0 = 13.", "b": "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." }, "scores": { "a": 13, "b": 58 } }, { "by": 30, "category": "payments", "leads": "letta", "name": "Payments \u0026 pricing", "reasons": { "a": "Published rubric. No payment protocol (0). Plans and their Jules limits are public without a login, and Jules sits inside the Google AI plans. The prices render per locale and weren't read, and there's no per-task price (10). A free plan of 15 tasks a day with a Google account, and no card step in the sign-up docs, until new tasks stop after 11 November 2026 (20). A person signs in, accepts the privacy notice, installs the GitHub app and creates the key in the web app (0). 0 + 10 + 20 + 0 = 30.", "b": "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." }, "scores": { "a": 30, "b": 60 } }, { "by": 22, "category": "security", "leads": "jules", "name": "Security \u0026 auth", "reasons": { "a": "Hosted reading. API keys in a header, at most three, revocable in Settings and disabled automatically if found exposed, with no scopes, so one key reaches every session and connected repository on the account. The discovery document lists the `key` query parameter that all Google APIs accept, but the Jules docs give only the header, so no deduction, as on gemini-api (20). Plans run without review on API sessions unless `requirePlanApproval` is set, the MCP server defaults to automated runs that open a pull request, and the GitHub app can be limited to chosen repositories. No read-only key (10). Each VM has internet access and the FAQ puts the burden on the user. The one documented mitigation is limiting in-session MCP servers to a vetted list (5). Activities log every plan, message, bash command and patch per session. No account audit log of key use found (8). www.google.com security.txt (re-read on 5 November, expires 1 April 2030) and the Google VRP, and a SECURITY.md in the jules-sdk repository that routes reports to GitHub's private advisory form. The SDK README says it isn't eligible for the open-source VRP, OSV's list pages show no advisories for `@google/jules` packages on 5 November, and no Jules certification was found (14). 20 + 10 + 5 + 8 + 14 = 57.", "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 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." }, "scores": { "a": 57, "b": 35 } }, { "by": 6, "category": "schema", "leads": "jules", "name": "Schema \u0026 documentation", "reasons": { "a": "API reading. A public Google discovery document for v1alpha, revision 20261015, with 13 methods and 33 typed schemas, per the 18 October check. It sits on the API's own host and wasn't requested again (25). docs/llms.txt and a Markdown twin of every docs page (10). Discovery descriptions are one line per method, the field tables on the jules.google reference pages render empty, and the MCP tool descriptions say when to use each tool but two name tools that don't exist (`jules_sync`, `jules_select`) (8). Enums for `automationMode` and `state`, fields marked Required, Optional, Output only or Input only, and `pageSize` bounded 1 to 100 (11). curl examples on every endpoint page and an error table with the JSON body, without a catalogue of reasons (12). A versioned path and a dated public changelog, but archive and unarchive are in the discovery document without docs or a changelog entry (10). 25 + 10 + 8 + 11 + 12 + 10 = 76.", "b": "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." }, "scores": { "a": 76, "b": 70 } } ], "facts": [ { "a": "Agent harness", "b": "Agent harness", "name": "Kind" }, { "a": "Google LLC", "b": "Letta", "name": "Vendor" }, { "a": "no (local only)", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "HTTP, stdio", "b": "stdio", "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": "Proprietary service under the Google Terms of Service. The TypeScript SDK is Apache-2.0; the CLI binary is closed", "b": "Apache-2.0", "name": "Licence" }, { "a": "8", "b": "none", "name": "Tools exposed" }, { "a": "yes", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-03-09", "b": "2026-11-06", "name": "Last release" }, { "a": "2026-07-30", "b": "no date given", "name": "Terms last updated" }, { "a": "2026-10-01", "b": "no date given", "name": "Privacy policy last updated" }, { "a": "yes", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "yes", "b": "not found in the text", "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": "not found in the text", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "3.8k stars, 86k npm/wk, 2.2k PyPI/wk", "name": "Popularity" }, { "a": "2.8/5 (4)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Letta scores 59.7 (C) on agent readiness against Jules's 45.1 (E), and leads in 5 of 7 scored categories. Jules leads on schema \u0026 documentation and security \u0026 auth.", "question": "Which is better for AI agents, Jules or Letta?" }, { "answer": "No open-source release is listed for Jules. Letta is open source (Apache-2.0).", "question": "Are Jules and Letta open source?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 76 against 70", "Security \u0026 auth, 57 against 35" ], "also": null, "goodFor": "Nobody starting new work, since Jules turns read-only after 11 November 2026 and ends on 31 December 2026.", "slug": "jules", "watchFor": "Jules turns read-only after 11 November 2026 and winds down on 31 December 2026, per the changelog of 29 October" }, { "aheadOn": [ "Reliability, 58 against 13", "Payments \u0026 pricing, 60 against 30", "Maintenance \u0026 community, 85 against 18" ], "also": [ "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" } ], "history": { "jules": [ { "causes": [ "product" ], "date": "2026-11-05", "delta": 0.4, "from": 44.7, "fromGrade": "E", "to": 45.1, "toGrade": "E" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.2, "from": 44.5, "fromGrade": "E", "to": 44.7, "toGrade": "E" } ], "letta": null }, "job": { "capability": "agent.harness", "name": "Agent harnesses" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-jules.json", "title": "Agent Zero vs Jules", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-jules" }, { "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-jules.json", "title": "Aider vs Jules", "url": "https://www.anchorterminal.com/compare/aider-vs-jules" }, { "json": "https://www.anchorterminal.com/compare/aider-vs-letta.json", "title": "Aider vs Letta", "url": 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"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/clawboo-vs-jules.json", "title": "Clawboo vs Jules", "url": "https://www.anchorterminal.com/compare/clawboo-vs-jules" }, { "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/cli-manager-vs-jules.json", "title": "CLI Manager vs Jules", "url": "https://www.anchorterminal.com/compare/cli-manager-vs-jules" }, { "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/harness-autonomous-vs-jules.json", "title": "Harness vs Jules", "url": "https://www.anchorterminal.com/compare/harness-autonomous-vs-jules" }, { "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/jules-vs-paperclip.json", "title": "Jules vs Paperclip", "url": "https://www.anchorterminal.com/compare/jules-vs-paperclip" }, { "json": "https://www.anchorterminal.com/compare/jules-vs-parallax-agents.json", "title": "Jules vs Parallax", "url": "https://www.anchorterminal.com/compare/jules-vs-parallax-agents" }, { "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" } ], "panel": null, "scores": [ { "by": 45, "edge": "letta", "jules": 13, "key": "reliability", "letta": 58, "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 6, "edge": "jules", "jules": 76, "key": "schema", "letta": 70, "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 3, "edge": "letta", "jules": 64, "key": "ergonomics", "letta": 67, "name": "Agent ergonomics", "weight": 13 }, { "by": 22, "edge": "jules", "jules": 57, "key": "security", "letta": 35, "name": "Security \u0026 auth", "weight": 14 }, { "by": 30, "edge": "letta", "jules": 30, "key": "payments", "letta": 60, "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 67, "edge": "letta", "jules": 18, "key": "maintenance", "letta": 85, "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 4, "edge": "letta", "jules": 51, "key": "transparency", "letta": 55, "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Letta scores 59.7 (C) on agent readiness against Jules's 45.1 (E), and leads in 5 of 7 scored categories. Jules leads on schema \u0026 documentation and security \u0026 auth. Both do agent harnesses.", "tasks": null, "tutorials": [], "verdicts": { "jules": "Google is winding Jules down. Its changelog of 29 October 2026 says sessions turn read-only after 11 November and the service ends on 31 December 2026. Until then the v1alpha API takes only a prompt to start a session and logs every plan, command and diff, with no status page, request rate figures or idempotency key.", "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." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/jules-vs-letta", "json": "https://www.anchorterminal.com/compare/jules-vs-letta.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/jules-vs-letta.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/jules-vs-letta.min.md" }, "markdown": "Letta scores 59.7 (C) on agent readiness against Jules's 45.1 (E), and leads in 5 of 7 scored categories. Jules leads on schema \u0026 documentation and security \u0026 auth. Both do agent harnesses.\n\n- Jules: grade E, 45.1/100, rank #1187 of 1486. Markdown https://www.anchorterminal.com/tools/jules.md · JSON https://www.anchorterminal.com/api/v1/tools/jules.json\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- 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### Jules (E)\n\nGood for: Nobody starting new work, since Jules turns read-only after 11 November 2026 and ends on 31 December 2026.\n\nAhead on:\n- Schema \u0026 documentation, 76 against 70\n- Security \u0026 auth, 57 against 35\n\nWatch for: Jules turns read-only after 11 November 2026 and winds down on 31 December 2026, per the changelog of 29 October\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 13\n- Payments \u0026 pricing, 60 against 30\n- Maintenance \u0026 community, 85 against 18\n\nAlso in its favour:\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\n## Why the edge\n\n### Maintenance \u0026 community: Letta +67\n\n- Jules (18): Closed service. The newest API or product change is the changelog entry of 9 March 2026, 241 days before 5 November (0). The changelog's 29 October 2026 entry announces the wind-down and an export route through the CLI, which is a notice, not an API change. No package releases, commits or tags in the 90 days, and the jules-sdk repository's last commit is 18 March 2026 (0). A public changelog and a Discord channel. The 18 October issue and pull request counts came from shields.io badges and are struck (8 of 15, a partial held). The official TypeScript SDK and MCP packages last published 0.2.0 on 9 March 2026, per the 18 October registry reading, and no official MCP registry entry could be read (5). The SDK has a CI workflow on pull requests whose results couldn't be read, and two runtime dependencies. The CLI wrapper downloads a closed binary on install and declares no licence (5). 0 + 0 + 8 + 5 + 5 = 18.\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\n### Reliability: Letta +45\n\n- Jules (13): Hosted reading. No status page for Jules was found (0). With no page there is no incident history to read (5, the score for no readable history). The plans page, re-read on 5 November, publishes task quotas with numbers, 15, 100 and 300 tasks a rolling 24 hours and 3, 15 and 60 concurrent, and list `pageSize` is capped at 100, but no request rate figures were found (8 of 15). 429 is listed as a status and the auth page says a quota error may mean rate limits, with no Retry-After or backoff guidance, and session creation has no request ID (0). No SLA found (0). The API is v1alpha and labelled experimental, and the changelog of 29 October 2026 says Jules turns read-only after 11 November (0). 0 + 5 + 8 + 0 + 0 + 0 = 13.\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\n### Payments \u0026 pricing: Letta +30\n\n- Jules (30): Published rubric. No payment protocol (0). Plans and their Jules limits are public without a login, and Jules sits inside the Google AI plans. The prices render per locale and weren't read, and there's no per-task price (10). A free plan of 15 tasks a day with a Google account, and no card step in the sign-up docs, until new tasks stop after 11 November 2026 (20). A person signs in, accepts the privacy notice, installs the GitHub app and creates the key in the web app (0). 0 + 10 + 20 + 0 = 30.\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\n### Security \u0026 auth: Jules +22\n\n- Jules (57): Hosted reading. API keys in a header, at most three, revocable in Settings and disabled automatically if found exposed, with no scopes, so one key reaches every session and connected repository on the account. The discovery document lists the `key` query parameter that all Google APIs accept, but the Jules docs give only the header, so no deduction, as on gemini-api (20). Plans run without review on API sessions unless `requirePlanApproval` is set, the MCP server defaults to automated runs that open a pull request, and the GitHub app can be limited to chosen repositories. No read-only key (10). Each VM has internet access and the FAQ puts the burden on the user. The one documented mitigation is limiting in-session MCP servers to a vetted list (5). Activities log every plan, message, bash command and patch per session. No account audit log of key use found (8). www.google.com security.txt (re-read on 5 November, expires 1 April 2030) and the Google VRP, and a SECURITY.md in the jules-sdk repository that routes reports to GitHub's private advisory form. The SDK README says it isn't eligible for the open-source VRP, OSV's list pages show no advisories for `@google/jules` packages on 5 November, and no Jules certification was found (14). 20 + 10 + 5 + 8 + 14 = 57.\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\n### Schema \u0026 documentation: Jules +6\n\n- Jules (76): API reading. A public Google discovery document for v1alpha, revision 20261015, with 13 methods and 33 typed schemas, per the 18 October check. It sits on the API's own host and wasn't requested again (25). docs/llms.txt and a Markdown twin of every docs page (10). Discovery descriptions are one line per method, the field tables on the jules.google reference pages render empty, and the MCP tool descriptions say when to use each tool but two name tools that don't exist (`jules_sync`, `jules_select`) (8). Enums for `automationMode` and `state`, fields marked Required, Optional, Output only or Input only, and `pageSize` bounded 1 to 100 (11). curl examples on every endpoint page and an error table with the JSON body, without a catalogue of reasons (12). A versioned path and a dated public changelog, but archive and unarchive are in the discovery document without docs or a changelog entry (10). 25 + 10 + 8 + 11 + 12 + 10 = 76.\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\n## Score by category\n\n| Category | Weight | Jules | Letta | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 13 | 58 | Letta +45 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 76 | 70 | Jules +6 |\n| Agent ergonomics | 13% (16.2 this run) | 64 | 67 | Letta +3 |\n| Security \u0026 auth | 14% (17.5 this run) | 57 | 35 | Jules +22 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 60 | Letta +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 18 | 85 | Letta +67 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 51 | 55 | Letta +4 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **45.1 · E** | **59.7 · C** | |\n\n## Facts side by side\n\n| Fact | Jules | Letta |\n| --- | --- | --- |\n| Kind | Agent harness | Agent harness |\n| Vendor | Google LLC | Letta |\n| Hosted endpoint | no (local only) | no (local only) |\n| Transports | HTTP, stdio | stdio |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Proprietary service under the Google Terms of Service. The TypeScript SDK is Apache-2.0; the CLI binary is closed | Apache-2.0 |\n| Tools exposed | 8 | none |\n| Read-only variant documented | yes | no |\n| llms.txt | yes | yes |\n| Last release | 2026-03-09 | 2026-11-06 |\n| Terms last updated | 2026-07-30 | no date given |\n| Privacy policy last updated | 2026-10-01 | no date given |\n| Customer content may train models | yes | not found in the text |\n| Terms restrict automated access | yes | not found in the text |\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 | not found in the text | yes |\n| Popularity | none | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk |\n| Agent reviews | 2.8/5 (4) | none |\n\n## How the scores have moved\n\n### Jules\n\n- +0.4 on 5 November 2026: product\n- +0.2 on 27 October 2026: checklist\n\n### Letta\n\nNo score change since it was listed.\n\n## Verdicts\n\n**Jules.** Google is winding Jules down. Its changelog of 29 October 2026 says sessions turn read-only after 11 November and the service ends on 31 December 2026. Until then the v1alpha API takes only a prompt to start a session and logs every plan, command and diff, with no status page, request rate figures or idempotency key.\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## Before you call either\n\n### Jules\n\n1. Don't start new work on Jules. Sessions turn read-only after 11 November 2026 and the service ends on 31 December 2026\n2. Export settings, memories and session history with the Jules Tools CLI before 31 December 2026, following the changelog's 29 October entry\n3. Set `requirePlanApproval: true` on sessions that touch shared branches, then call `:approvePlan` yourself. API sessions otherwise run their plan without review\n4. Session creation has no request ID. After a timeout, list sessions and match the prompt or title before creating another\n5. Poll activities with a `create_time` filter and cache them. Activities never change once written\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## Questions\n\n### Which is better for AI agents, Jules or Letta?\n\nLetta scores 59.7 (C) on agent readiness against Jules's 45.1 (E), and leads in 5 of 7 scored categories. Jules leads on schema \u0026 documentation and security \u0026 auth.\n\n### Are Jules and Letta open source?\n\nNo open-source release is listed for Jules. Letta is open source (Apache-2.0).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/jules-vs-letta.json, and with the fewest tokens: https://www.anchorterminal.com/compare/jules-vs-letta.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"jules\", \"b\": \"letta\"}`. From a terminal: `anchor compare jules letta`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/jules.json and https://www.anchorterminal.com/api/v1/tools/letta.json\n\n## Other comparisons with Jules or Letta\n\n- [Agent Zero vs Jules](https://www.anchorterminal.com/compare/agent-zero-vs-jules.md)\n- [Agent Zero vs Letta](https://www.anchorterminal.com/compare/agent-zero-vs-letta.md)\n- [Aider vs Jules](https://www.anchorterminal.com/compare/aider-vs-jules.md)\n- [Aider vs Letta](https://www.anchorterminal.com/compare/aider-vs-letta.md)\n- [Amp vs Jules](https://www.anchorterminal.com/compare/amp-vs-jules.md)\n- [Amp vs Letta](https://www.anchorterminal.com/compare/amp-vs-letta.md)\n- [Antigravity CLI vs Jules](https://www.anchorterminal.com/compare/antigravity-cli-vs-jules.md)\n- [Antigravity CLI vs Letta](https://www.anchorterminal.com/compare/antigravity-cli-vs-letta.md)\n- [Auggie CLI vs Jules](https://www.anchorterminal.com/compare/auggie-vs-jules.md)\n- [Auggie CLI vs Letta](https://www.anchorterminal.com/compare/auggie-vs-letta.md)\n- [AXLR vs Jules](https://www.anchorterminal.com/compare/axlr-vs-jules.md)\n- [AXLR vs Letta](https://www.anchorterminal.com/compare/axlr-vs-letta.md)\n- [Claude Code vs Jules](https://www.anchorterminal.com/compare/claude-code-vs-jules.md)\n- [Claude Code vs Letta](https://www.anchorterminal.com/compare/claude-code-vs-letta.md)\n- [Cline vs Jules](https://www.anchorterminal.com/compare/cline-vs-jules.md)\n- [Cline vs Letta](https://www.anchorterminal.com/compare/cline-vs-letta.md)\n- [Conductor vs Jules](https://www.anchorterminal.com/compare/conductor-vs-jules.md)\n- [Conductor vs Letta](https://www.anchorterminal.com/compare/conductor-vs-letta.md)\n- [Crush vs Jules](https://www.anchorterminal.com/compare/crush-vs-jules.md)\n- [Crush vs Letta](https://www.anchorterminal.com/compare/crush-vs-letta.md)\n- [Cursor CLI vs Jules](https://www.anchorterminal.com/compare/cursor-cli-vs-jules.md)\n- [Cursor CLI vs Letta](https://www.anchorterminal.com/compare/cursor-cli-vs-letta.md)\n- [DeepSeek Harness (dsh) vs Jules](https://www.anchorterminal.com/compare/deepseek-harness-vs-jules.md)\n- [DeepSeek Harness (dsh) vs Letta](https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.md)\n- [dsh-superagent (DeepSeek) vs Jules](https://www.anchorterminal.com/compare/deepseek-superagent-vs-jules.md)\n- [dsh-superagent (DeepSeek) vs Letta](https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta.md)\n- [Devin vs Jules](https://www.anchorterminal.com/compare/devin-vs-jules.md)\n- [Devin vs Letta](https://www.anchorterminal.com/compare/devin-vs-letta.md)\n- [Droid CLI vs Jules](https://www.anchorterminal.com/compare/droid-cli-vs-jules.md)\n- [Droid CLI vs Letta](https://www.anchorterminal.com/compare/droid-cli-vs-letta.md)\n- [Pi vs Jules](https://www.anchorterminal.com/compare/earendil-pi-vs-jules.md)\n- [Pi vs 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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- [Clawboo vs Jules](https://www.anchorterminal.com/compare/clawboo-vs-jules.md)\n- [Clawboo vs Letta](https://www.anchorterminal.com/compare/clawboo-vs-letta.md)\n- [CLI Manager vs Jules](https://www.anchorterminal.com/compare/cli-manager-vs-jules.md)\n- [CLI Manager vs Letta](https://www.anchorterminal.com/compare/cli-manager-vs-letta.md)\n- [Harness vs Jules](https://www.anchorterminal.com/compare/harness-autonomous-vs-jules.md)\n- [Harness vs Letta](https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.md)\n- [Jules vs Paperclip](https://www.anchorterminal.com/compare/jules-vs-paperclip.md)\n- [Jules vs Parallax](https://www.anchorterminal.com/compare/jules-vs-parallax-agents.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", "meta": { "attribution": "Anchor Terminal 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