AI Weekly: 3/27–4/1 | Anthropic's Triple Shock, Arm's First-Ever Chip, Apple Opens Siri to Rivals

One-line summary: Anthropic stole every headline this week — but half the spotlight was unplanned. 1. Top Story: Anthropic's Triple Shock No company dominated the news cycle this week more than Anthropic — yet two of its three appearances were accidents. IPO Plans Revealed (3/27) Bloomberg reported that Anthropic is considering going public as early as October, potentially raising over $60 billion. The company has held preliminary talks with Goldman Sachs, JPMorgan, and Morgan Stanley. Context: Metric Number February funding round valuation $380 billion Paid subscription growth More than doubled since January 2026 Enterprise first-purchase win rate ~70% (vs. OpenAI) Daily new free users Over 1 million This isn't just an IPO — it's a signal that the AI industry's competitive axis has shifted from "whose model scores higher" to "who becomes a public company first." Anthropic and OpenAI are both preparing 2026 listings; capital markets are now pricing the AI duopoly showdown. Claude Mytho