OpenAI launches Rosalind Biodefense, a gated life-sciences model free to governments for pandemic preparedness with partners at Lawrence Livermore and CEPI. Microsoft Build 2026 opens Tuesday with Windows positioning as an AI agent platform and a multi-model Copilot stack that formally adds Anthropic. Meanwhile, a 624-point Hacker News thread argues domain expertise — not technical skill — is the durable moat in the agent era.