Anthropic announced Duet, a consumer AI agent in preview with a wait list for Pro and Max subscribers, on October 21, 2026. Reporting since has established that it runs on Opus 5.5, checks connected accounts every few hours, and asks approval before sending, paying, signing or deleting. Anthropic also says Duet may misread threads, miscalibrate urgency, and handle personal errands worse than rival agents, which sharpens the question of what the preview is actually for. When the wait list clears remains open.