Anthropic opened Claude Duet as a research preview on October 21, 2026. It runs on Claude Opus 5.5 and works on its own computer in the cloud, so it keeps going after you close the app. Anthropic says it built Duet "for professionals and small business owners with more on their plates than they can track." For now it is a waitlist for Pro and Max subscribers in the US.
Duet gets its reach from the apps you connect. Anthropic puts the number of connectors and plugins at more than 6,000, and the list includes the tools a small business already pays for: QuickBooks, Stripe, Gusto, HubSpot, Docusign and Shopify. Microsoft 365 is not on the list yet, and Duet can't make phone calls or text other people.
| Job | What Duet does | What waits for you |
|---|---|---|
| Unpaid invoices | Finds them in QuickBooks and drafts the reminders | Sending them |
| Payroll | Fills in Gusto with the week's hours and bonuses | Checking and running it |
| Contracts | Gets the Docusign agreement ready | The signature |
| Reports | Builds a dashboard or financial model in the Make tab | Deciding what it means |
| Supplies | Shows an approval card, then pays with Link or Shop Pay using a one-time card | The approval |
We can't try Duet yet, so picture Anthropic's own examples in one business. At 7 a.m. the morning brief lands. QuickBooks shows three unpaid catering invoices, and the reminders are already drafted. Next comes payroll: Duet fills in Gusto with this week's hours and bonuses and lays it out for the owner to check.
A wedding wants catering, so the Docusign contract is ready and waiting for the owner's tap. Then the big ask: build one page that shows whether the business is healthy. Duet pulls sales, payroll and unpaid invoices into a single dashboard. And when the to-go boxes run low, it can order more, but only after an approval card, and it pays with a one-time card for that purchase.
One real restaurant owner Anthropic quoted, with about 110 employees, summed up the appeal: he doesn't need to open a hundred tabs.
Duet asks before it sends, pays, signs or deletes. Two things are off-limits even if you say yes: trading securities and moving money between accounts. It also checks your connected accounts every few hours, and that background work counts toward your usage limits, so an agent that never stops can eat into the Claude time you wanted for yourself.
Where KiS lands: yes for the prep work, because drafting, filling in and building carry little risk. But keep every send, payment and signature behind your own tap, and check the source of its numbers first.
1. Keep approvals on. No reminder, payment or contract goes out without your yes.
2. Check its work. Open the numbers it pulled from QuickBooks or Gusto and spot-check one before you approve.
3. Start with one job. Give it invoice reminders for a week, watch your usage, then add payroll.
Let Duet do the prep, and keep the money behind your own tap. Keep it simple.
An agent that can touch your books is only as safe as the rules you give it and as useful as what it knows about your business. Decide both on purpose before the waitlist email arrives. If you want Claude to understand your clients, prices and the way you work before you hand it real jobs, start with why AI needs a second brain to be useful.
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