Claude Duet: Anthropic’s Agent Runs on Opus 5.5

Anthropic has opened a research preview of Claude Duet, a new proactive AI agent that messages users, works inside connected apps, and keeps running tasks after they close the app. The move, reported by The Verge on October 21, 2026, puts Anthropic squarely into the fight for a new category of AI product: the “always-on” personal agent that Meta, OpenAI and Google have all raced to ship since late summer.