Anthropic describes Claude Duet as a new app where Claude acts proactively: it brings important matters to your attention, completes requested tasks, keeps working while you step away, and checks with you before acting on your behalf (Claude’s announcement). Anthropic says it is built around Claude Opus 5.5 and carries over your Claude account’s memory, skills, and connected apps. The early research preview is waitlist-only for Pro and Max subscribers in the US. The supplied announcement says it can still misjudge what needs attention; Anthropic says it will share more about its safety approach soon.