The Bill Has Arrived

At Microsoft Build 2026, the company unveiled its MAI family of frontier AI models, a direct shot across the bow at Claude Code and OpenAI's developer tools. GitHub Copilot simultaneously announced a switch from flat-rate to token-based billing, with some enterprise teams reporting monthly invoices jumping from $29 to over $750. Meanwhile, an unnamed Fortune 100 client quietly accumulated a $500 million Claude API bill in a single month, and law firm Kirkland and Ellis committed half a billion dollars to build a proprietary AI platform rather than rely on off-the-shelf tools. Three action items for CEOs this week: audit every flat-rate AI contract before your next renewal, set hard token budget ceilings at the team level before bills arrive, and watch Microsoft Build announcements closely for capability shifts that could reorder your vendor stack.