Claude Opus 5 Ships and Notion Acquires an AI Model Lab

Two signals dominate today: Anthropic shipped Claude Opus 5 with explicit positioning around long-running agents (not just chat), and Notion quietly acquired ZeroEntropy, a startup building efficient task-specific models. Read together, they're both bets on the same thing — that the next phase of AI products runs on specialized, reliable agents rather than general-purpose chat.