A multi-framework stress test of Big Tech's AI spending ranks Microsoft and Amazon as the clear leaders, with Alphabet in third, Meta fourth, and Oracle last, a hierarchy consistent across spending plans, funding methods, balance-sheet strength, and verifiable returns. The analysis arrives as hyperscaler stocks rally following strong quarterly results: AWS revenue surged 37% to $42.2 billion, while operating income soared 63% to $16.6 billion. Azure revenue climbed 43% in its recently ended fiscal fourth quarter, and Microsoft holds a 27% stake in OpenAI. Alphabet is gaining market share rapidly, and Amazon is experiencing accelerating momentum, with both its custom chip and AI businesses reaching $25 billion revenue run rates. Microsoft funds its build from cash flow, carries the cleanest balance sheet, and discloses real AI numbers, while Amazon borrows more but backs it with a mighty cash engine and a $25 billion chip business on named contracts. Meta offers the best proof of AI-driven revenue generation but carries a thinner cash cushion and rising debt. The three leaders combine established franchises, diversified revenue, and the financial firepower to sustain massive AI infrastructure investments while continuing to grow profits. Microsoft sits on the industry's largest cloud computing backlog at $678 billion.