› Claude Duet is Anthropic's attempt to flip the usual chatbot relationship.
› Instead of waiting for a prompt, Duet reads your mail, calendar and connected apps on a schedule and messages you first when it thinks something needs a decision.
› It opened as a research preview on October 21, 2026, on iPhone, Android and the web, and the announcement was updated on October 23.
› We have not tested Duet - we have no access - so everything below comes from Anthropic's announcement, its help center and the reporting listed at the end.