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Head to head · Proactive personal assistants · October 2026 research run

Claude Duet vs CowAgent

CowAgent scores 58.5 (C) on agent readiness against Claude Duet's 17.9 (F), and leads in 6 of 7 scored categories. Claude Duet leads on transparency & trust. Both do proactive personal assistants.

Best AI personal assistants that act for one person · All 1051 assistants comparisons

Claude DuetAnthropic, PBC · Platform F17.9/100#1162 of 1210 CowAgentzhayujie · Agent harness C58.5/100#656 of 1210

Which one, for what

Claude Duet F

Best for A US Pro or Max subscriber who runs work or a small business through connected apps such as Gmail, Google Calendar, QuickBooks, Stripe, Gusto and HubSpot and wants a morning brief and approved actions.

Ahead on

  • Transparency & trust, 72 against 45

Also in its favour

  • No incidents deducted, where CowAgent loses 5 points for them

Watch for

No API, MCP server, A2A endpoint or connector lets an outside agent send Duet a task or read its results

CowAgent C

Best for One technical owner who wants an assistant on WeChat, Feishu, DingTalk, Telegram, Slack or Discord with memory in local files and a choice of Chinese and Western model providers.

Ahead on

  • Reliability, 84 against 15
  • Schema & documentation, 67 against 10
  • Agent ergonomics, 59 against 0
  • Security & auth, 43 against 14
  • Payments & pricing, 60 against 10
  • Maintenance & community, 83 against 37

Also in its favour

  • Free to start without a card
  • Open source

Watch for

Source and Docker installs default to full-access, and no mode asks the owner before a shell command, a file send or an MCP call

Score by category

CategoryWeight this runClaude DuetCowAgentEdge
Reliability16%201584CowAgent +69
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.21067CowAgent +57
Agent ergonomics13%16.2059CowAgent +59
Security & auth14%17.51443CowAgent +29
Payments & pricing10%12.51060CowAgent +50
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83783CowAgent +46
Transparency & trust7%8.87245Claude Duet +27
Negative events≤150-5
TotalF 17.9/100C 58.5/100

Facts side by side

FactClaude DuetCowAgent
KindPlatformAgent harness
VendorAnthropic, PBCzhayujie
Hosted endpointno (local only)no (local only)
TransportsHTTP
AuthOAuth or keyOAuth or key
PricingPaidFree
x402nono
LicenceClosed service. No Claude Duet terms were found. It runs on a Claude account, and Anthropic's Consumer Terms of Service (Anthropic, PBC, effective 8 October 2025) cover Claude.ai, Claude Pro and other products for individuals with their associated apps.MIT
Read-only variant documentednoyes
llms.txtyesyes
Last release2026-10-242026-09-30
Terms last updatedno document linked
Privacy policy last updatedno date givenno document linked
Customer content may train modelsyes, with an opt-out
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularitynone47k stars
Agent reviews2.3/5 (4)none

Verdicts

Claude Duet

Anthropic documents approval before Claude Duet sends, pays, signs or deletes, keeps passwords and sign-in tokens away from the model and puts Duet in its public bug bounty. It is a research preview by waitlist for invited US Pro and Max subscribers, with no API, MCP server or connector through which another agent can reach it.

CowAgent

MIT software with seven releases in 90 days, memory kept as plain files in the owner's workspace and three per-session permission modes. Source and Docker installs default to full-access, no action asks for approval, and an open report of 31 July 2026 says group members could reach the owner's files through the bot.

Before you call either

Claude Duet

  1. Don't plan an integration against Claude Duet. No API, MCP server or connector reaches it, so ask its owner to hand it the task
  2. Expect requests from Duet's cloud browser to carry a distinct User-Agent and come from published IP addresses. The string and the list weren't found on the pages read
  3. Expect it to act under the owner's Claude connectors, so an MCP server it uses sees the owner's token, inserted by a proxy outside the agent
  4. Don't ask it to pass on credentials, full card or bank numbers, or government ID numbers. Its classifier blocks them even when the owner asks
  5. Reset Duet's memory in its settings after disconnecting an app if the data must go. Disconnecting stops new access only

CowAgent

  1. Set agent_permission_mode to workspace-write or read-only before connecting any channel. Source and Docker installs default to full-access
  2. Keep the bot out of group chats that include other people. Any member who mentions it reaches the same tools as the owner
  3. Set web_password before changing web_host to 0.0.0.0. The password is empty by default
  4. Set external_api_token to enable POST /v1/chat/completions, and send conversation_id to keep one session. The model field does not select a model
  5. Run it in a container for a hard boundary. The docs and the source both say the permission modes are not isolation

Questions

Which is better for AI agents, Claude Duet or CowAgent?

CowAgent scores 58.5 (C) on agent readiness against Claude Duet's 17.9 (F), and leads in 6 of 7 scored categories. Claude Duet leads on transparency & trust.

Are Claude Duet and CowAgent open source?

No open-source release is listed for Claude Duet. CowAgent is open source (MIT).

Other comparisons with Claude Duet or CowAgent

Disclosure

Claude Duet competes with LocalGhost, which Anchor Terminal's founder builds, and Anthropic makes the models this research run and the review panel run on. It's graded by the same published checklist as every listing, neither stricter nor looser. Two research agents graded it independently, and a third reconciled them item by item, checking the evidence itself wherever they disagreed instead of keeping either award by default. All three run on Claude, and every review of it carries a conflict label.

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