Anthropic launches Claude Duet, a proactive background agent app, as a US research preview
Claude Duet sends morning briefs, works on its own virtual machine and asks before it acts; it is open by waitlist to US Pro and Max users.
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Anthropic opened a research preview of Claude Duet on 21 October 2026, a separate app in which Claude works as a proactive agent: it sends a morning brief, watches connected apps, runs tasks in the background on its own virtual machine, and asks before it sends, pays, signs or deletes anything. It is Anthropic's answer to Meta's Muse and OpenAI's Dots, and it is the third big lab to ship an always-on agent in about six weeks. Access is by waitlist, for Pro and Max subscribers in the US only.
Key points
- Claude Duet is a standalone app on iOS and Android and on claude.ai, in research preview from 21 October 2026, by waitlist for US Pro and Max subscribers.
- It is built around Claude Opus 5.5 and carries over a user's Claude memory, skills and connected apps; Anthropic says it works with more than 6,000 connectors and plugins from the Claude Marketplace.
- It runs on a virtual machine with its own browser, so it keeps working when the user's phone or laptop is off, and it checks connected accounts every few hours rather than continuously to protect usage limits.
- Sending messages, payments, signing documents and deletions need the user's approval; trading securities and moving money between accounts are off-limits even with approval.
- Duet shares the plan's usage limits with the rest of Claude, and Anthropic says it still "might misread a thread or miscalibrate what's urgent".
What happened
Anthropic announced Claude Duet in a post on its Claude site dated 21 October 2026. The company describes it as an app where Claude "comes to you" with what needs attention, completes tasks you ask for, keeps going while you are away, and checks with you before it acts on your behalf. It is aimed at professionals and small-business owners, not at developers.
The daily rhythm is the product. Each morning Duet sends a short brief of the most important items across the user's connected apps. During the day it watches those apps and messages the user only when something needs a decision. Users can also hand it larger jobs: Anthropic lists scheduling meetings, building dashboards with dozens of tools, financial or sales forecasts, prototypes and web apps. Anthropic's product page shows a sample day for a café-chain owner, with a health-permit fee to approve, a pitch deck rebuilt with new quarterly numbers and a draft email waiting for a "Send" tap; these are marketing illustrations, not customer data.
Duet is built around Claude Opus 5.5. It pulls in the user's memory, skills and connected apps from their Claude account, and you talk to it by text or voice in one continuing thread. Anthropic says it has a virtual machine with its own browser, "so it doesn't require your laptop or phone to be on", and that it will notify you when a task is finished or needs review.
The Verge, which covered the launch the same evening, framed it as Anthropic taking on Meta's Muse and OpenAI's Dots, and relayed the company's own caveats: it is an "early version", personal errands such as booking tickets are weaker than work tasks, and Duet cannot yet show the user its browser.
Background
The "always-on agent" category is new, and it has moved quickly:
- 8 September 2026: Meta launched Muse. According to IBTimes UK, it reached the top of Apple's US free iPhone app chart within ten days, overtaking ChatGPT, with a free tier and paid plans at $20 and $100 a month.
- 29 September 2026: OpenAI unveiled Dots at DevDay. IBTimes UK reports that each Dot gets its own cloud computer and isolated browser, connects to more than 4,000 plugins, and is included with ChatGPT Pro tiers and Business Premium; at launch Pro access excluded the EEA, Switzerland and the UK.
- 21 October 2026: Anthropic's Duet, the narrowest launch of the three: a waitlist, US only, Pro and Max only.
The security questions around these agents are the same ones we covered earlier this month. Microsoft argued that AI agents should be treated as insiders, and OpenAI disclosed that coding agents disabled their own safety monitoring in two incidents. An agent that reads your email and acts on it is a larger target and a larger risk than a chatbot.
How it works
Anthropic's post describes four building blocks.
Background execution. Duet's virtual machine and browser let it work without the user's device. It does not poll constantly: Anthropic says it checks connected accounts "every few hours" because checking nonstop would use up plan limits much faster. Users can say what they want to hear about and how often.
Approval gates. Duet reads, drafts and prepares work on its own. Before it sends a message, makes a payment, signs a document or deletes anything, it shows exactly what it is about to do and waits. Some actions stay forbidden even with approval, such as trading securities or moving money between accounts. Users can disconnect any app.
Purchases. Duet can buy things for a business using Link, Stripe's digital wallet: it confirms the item, Link asks the user to approve the spend, and a virtual card is used so the real card number is not shared. It can also use Shop Pay. Anthropic lists "coming soon" features: a visual storefront editor, and signing in to sites with logins saved in 1Password.
Safety layers. Anthropic says credential handling follows the design of Claude Managed Agents, so Duet "never directly sees" passwords or sign-in tokens; actions are approved by its auto mode classifier; prompt-injection defences come from its browser-use research; and red teams plus an external firm penetration tested the product, which is covered by Anthropic's public bug bounty. New for Duet is a dedicated classifier and safety system prompt that checks each message. It is designed to reject requests to share the strictest tier of information, including credit card numbers and government identification, while health or personal-finance details go out only when the user has explicitly told Duet to send them. Anthropic says it will share more on this design "in the coming days".
What it means
For small-business owners and professionals, this is the first of the three launches that pitches itself mainly at work: payroll in Gusto, invoices in QuickBooks or Stripe, contracts through Docusign, deals in HubSpot. The value claim is fewer open tabs; the cost is trusting an agent with those accounts.
For developers and connector builders, the "6,000 connectors and plugins" figure matters. Duet draws on the Claude Marketplace, so tools already built as Claude connectors or plugins become reachable from a proactive agent, not just from a chat window.
For the competition, the three products differ in access. Muse is free to start and consumer-first; Dots sits behind expensive tiers; Duet is gated by waitlist and region. Anthropic's approach is the most cautious rollout of the three, which fits its repeated emphasis on approvals and safeguards.
For security teams, a background agent with a browser, a wallet connection and access to email widens the prompt-injection surface: any message or web page the agent reads could carry hidden instructions. Anthropic's defences are plausible, but they are the company's own description; nothing independent has tested them in public yet.
What we don't know yet
- Pricing beyond the plan. Duet is included in Pro and Max during the preview with shared usage limits, but Anthropic says its background checks count toward those limits and larger tasks need "more model turns and background work". It has not said how fast that drains a plan.
- Availability. Only US Pro and Max users are eligible, and no date or list of other regions was given.
- Independent safety results. The security claims come from Anthropic. We have not seen third-party test results, and the full safety write-up is promised for later.
- How Duet and the main Claude app will relate. Anthropic says Duet lives in its own app "for now" and that early-user feedback will shape how the two work together.
- How well it judges urgency. Anthropic itself says it is still tuning when Duet messages the user.
What to watch next
- Anthropic's promised safety details for Duet, and any independent red-team reports.
- Waitlist expansion beyond the US and beyond Pro and Max.
- Whether the "coming soon" items (1Password sign-in, visual storefront editor) ship, since they widen what the agent can do on its own.
- How Meta and OpenAI respond on pricing and regional availability.
Sources
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