Azure grew 43% last quarter, closing a fiscal year in which it passed $100b of revenue at 41% growth.1 Google Cloud grew 82%.
Eighteen months ago the three grew within a few points of each other.2 The smallest now compounds at nearly twice Azure’s rate & almost three times AWS’s.
Google is spending to win the race. Alphabet’s $44.9b of quarterly capex runs at nearly twice Google Cloud’s $24.8b of revenue, & cloud operating margin still expanded from 20.7% to 35.6% as operating income tripled.2
That margin is the point. Google owns the model & designs the chip, so it keeps the economics a reseller pays away. This aggression is informed by superior economics.
In contrast, Microsoft must adopt a different strategy. Maia 200 & Cobalt are real if nascent, but Google sells TPUs as systems while Microsoft still deploys mostly merchant silicon, renting Nvidia’s roadmap at Nvidia’s margin.3
Two things follow. A thinner margin structure buys less capacity per dollar of revenue, & the exposure behind its backlog argues for restraint even where it could afford to spend.
Microsoft will still spend more than $50b next quarter, & the $35.8b on the chart is only cash, nearer $41b once finance leases count. Roughly two-thirds goes to CPUs & GPUs rather than land & concrete.3 Hood frames that as flexibility: “if the demand environment changes, you just slow down what is, in fact, the largest component.” The likelier reading is capacity you can actually buy, funded from cash flow, without underwriting a decade of concrete.
Concentration is the other reason to hold back. Contracted backlog reached $678b, the largest of the three, but Hood disclosed that it “increased 25% when excluding OpenAI.”3 Of roughly $310b added this year, some $220b traces to one customer that has committed to buy $250b of Azure capacity.4 Nearly half Microsoft’s future book rests on one company that funds its commitments from capital markets rather than profits.
The market isn’t blind to these risks. Nvidia’s five-year credit default swaps hit a record 82 basis points on Monday, doubling from 40 at the start of the month, after reports it would guarantee $250b of OpenAI datacenter leases.5
The bear case: hedge during uncertainty.
Nadella sells a stack where “every model is substitutable,” a virtue you emphasize when you do not own the frontier. Reselling it leaves Microsoft paying someone else’s margin on every incremental workload.
The elephant in the room is actually a circle of elephants. Nvidia is guaranteeing OpenAI’s datacenter leases & financing its chip purchases, so the same borrowed dollar shows up as contracted backlog on more than one balance sheet.5 S&P downgraded Oracle to one notch above junk for the same reason, naming OpenAI a central credit risk against roughly half of its $638b book.
Google presses because it owns the stack & the ROI is juicy. Microsoft hedges because it resells both layers & half its forward book depends on one borrower.
The three clouds are all accelerating, the circularity is increasing, spreads are widening, & Amazon reports tomorrow.6
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Microsoft FY26 Q4 earnings press release: Azure & other cloud services revenue up 43%, commercial RPO up 84% to $678b, total revenue of $90.0b up 18%, Intelligent Cloud revenue of $39.3b up 32%, & Azure surpassing $100b of annual revenue for the first time. The 41% full-year Azure growth rate is from Satya Nadella’s remarks on the Q4 FY26 earnings call. ↩︎
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Alphabet Q2 2026 earnings: Google Cloud revenue of $24,768m up 82%, cloud operating income of $8.8b against $2.8b a year earlier, operating margin of 35.6% against 20.7%, & capex of $44,924m. Alphabet capex supports Search & YouTube alongside Cloud, so the ratio to cloud revenue is illustrative rather than a segment figure. AWS growth of 28% is Q1 2026 per Amazon’s Form 10-Q. ↩︎ ↩︎
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Microsoft Q4 FY26 earnings call, July 29, 2026. Amy Hood on RPO growth of 25% excluding OpenAI, sequential RPO growth from customers outside Frontier model companies, nearly 90% of full-year cloud revenue from the same group, Q1 capex guidance above $50b, roughly two-thirds of capex in short-lived assets, & demand continuing to exceed available supply. Nadella on adding 31 datacenters in the quarter & reducing deployment times for new GPUs in the largest regions by nearly 50%. Cash capex of $35.8b was about $41b including $5.6b of finance leases, funded from operating cash flow of $55.4b with free cash flow of $19.6b. Nadella on Maia 200, Cobalt, & model substitutability. ↩︎ ↩︎ ↩︎
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OpenAI contracted to purchase an incremental $250b of Azure services in the October 2025 restructuring. Microsoft demand backlog doubles to $625 billion thanks to OpenAI: roughly 45% of the January 2026 balance of $625b attributed to OpenAI. Microsoft has not disclosed an updated share of the $678b Q4 balance; the $220b is derived from the reported 84% total & 25% ex-OpenAI growth rates. ↩︎
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Nvidia’s rising CDS the talk of Wall Street amid circular financing fears: five-year CDS of 82 basis points on July 27, 2026, against 68 the prior session & 40 at the start of the month. S&P downgrades Oracle to BBB- on July 9, 2026, one notch above speculative grade, citing AI datacenter investment & naming OpenAI a central credit risk, with roughly half of Oracle’s $638b of contracted backlog attributable to OpenAI alone; Oracle’s five-year CDS reached roughly 215 basis points. Alphabet’s free cash flow turns negative: negative $5.9b in Q2 2026, its first negative quarter since the 2004 IPO. Azure Q1 growth guidance of approximately 45% per the Q4 FY26 earnings call. ↩︎ ↩︎
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Amazon Q1 2026 Form 10-Q: AWS segment sales of $37,587m, 28% growth, backlog of $364b. Amazon reports Q2 2026 results on July 30, 2026. Latest reported quarters show all three accelerating: Azure 40% to 43%, Google Cloud 63% to 82%, & AWS 24% to 28%. ↩︎