On October 21, 2026, Anthropic opened a research preview of Claude Duet. Their own announcement describes it as a new app where Claude works as a proactive agent: it comes to you with what needs your attention, completes tasks you ask of it, keeps working when you step away, and checks with you before it acts.
It runs on Claude Opus 5.5, and it uses the memory, skills and connected apps your Claude account already has. So if Claude already knows your clients and your tone, Duet starts with that.
| Question | Answer |
|---|---|
| Who can get it? | A waitlist for Pro and Max subscribers in the US. Team and Enterprise plans are not included yet. |
| Where does it run? | Its own app on iPhone and Android, and on claude.ai. |
| What does it watch? | Your email and calendar, plus the apps you connect. It handles scheduling and invoicing tasks. |
| Does it act on its own? | It starts the work on its own, then asks for your approval before major actions. |
| Does it cost extra? | Its background work counts toward your plan's usage limits. |
Most AI waits for you. You type, it answers, and nothing happens until you come back. Duet works the other way round. It reads what is coming in, decides what matters, and gets started before you ask.
That is a big shift for a small business. The assistant is no longer a tool you pick up. It is closer to a helper who is already at the desk when you arrive.
We can't try it yet, so here is what a day could look like. Picture a solo bookkeeper. Overnight her inbox fills up. One client wants to move tomorrow's meeting, and another is still waiting on an invoice.
Duet flags those two and lets the newsletters wait. It checks her calendar, finds a free slot on Thursday, and drafts a reply offering it. Then it pulls the client's name, hours and rate and builds a draft invoice. It doesn't send it. It just gets it ready.
While she is out meeting a client, Duet keeps working through its list. Then her phone buzzes: the new meeting time and the invoice are ready. Approve or edit. Nothing goes out until she taps yes.
Two things to watch. First, all that background work counts toward your usage limits. An assistant that never stops can use up your limit before you sit down to use Claude yourself.
Second, it touches money and customer email. One wrong invoice, or a reply to the wrong client, costs more than the time it saved. And so far the reports don't spell out exactly what counts as a "major action" that needs your approval.
Where KiS lands: yes for drafting and scheduling, but keep approval on for anything that sends money or messages to customers, because one wrong invoice costs more than the time Duet saves.
1. Keep approval on for anything that sends. Invoices, payments and any email to a client wait for your yes.
2. Start small. Give it drafts and scheduling for a week. Read what it writes, and only then trust it with more.
3. Watch your usage. Check your limits after the first few days, so the background work doesn't leave you stuck halfway through your own task.
Let it draft and schedule, and keep your own yes on the money. Keep it simple.
An agent that works while you're away is only as good as what it knows about your business and the limits you give it. Set those on purpose. If you want your AI to understand your clients, prices and tone before you hand it real work, start with why AI needs a second brain to be useful.
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