Claude Becomes Copilot’s Default

Microsoft is steering Visual Studio Code and GitHub Copilot to prefer Anthropic’s Claude 4/Sonnet 4 over OpenAI’s GPT‑5, per internal guidance, and will use Anthropic models in Microsoft 365 features. At the same time, it is scaling its own MAI‑1 models beyond the 15,000 H100s used for the preview. — A hyperscaler’s vendor shift in flagship tools signals a best‑of‑breed, multi‑model era that weakens single‑lab dominance and will influence AI procurement, standards, and competition.