Alphabet and Microsoft just showed Wall Street how lucrative the AI arms race can be when you sell the weapons. Google Cloud more than doubled its revenue year over year, and Microsoft's Azure business grew 48% in its latest quarter.

The catch is that some of their best customers are also their fiercest competitors. Reuters Breakingviews has described the next frontier in artificial intelligence as figuring out how to manage corporate frenemies, and the latest figures show why that problem is getting expensive.

The Numbers Behind the Cloud Boom

Alphabet reported Google Cloud revenue of $30.71 billion for Q3 2026, a 103% increase from the same period a year earlier. Analysts had expected growth of roughly 95%, which would have put revenue at about $29.57 billion. Google cleared that bar by more than $1 billion.

Microsoft's Azure business grew 48% in the company's fiscal Q1 2027, reaching approximately $33.17 billion in revenue. On top of that, Microsoft recorded $10 billion in revenue tied to its arrangements with OpenAI during the quarter.

Cloud divisions are where the AI boom converts into booked revenue, since model developers pay for the compute used to train and run their systems — the dynamic behind Anthropic's sprawling commitments and Microsoft's OpenAI income. The growth is not free, though. Alphabet posted negative free cash flow of $9.07 billion in Q3 2026, and its AI-related capital expenditures for the quarter totaled $51.36 billion, exceeding its Google Cloud revenue for the same period.

Partner, Supplier, and Rival All at Once

The relationships underneath these figures are tangled. According to Reuters Breakingviews, Google is simultaneously a part-owner of Anthropic, the maker of the Claude AI models, a supplier to the company, and a competitor against it.

Anthropic's contractual commitments show how deep these ties run. The AI lab has committed at least roughly $114.5 billion to Google through July 2033. It has also made commitments of approximately $110 billion to Amazon and approximately $44.9 billion to Microsoft, spreading its business across all three major cloud providers.

Those platforms matter to Anthropic's top line as well. About 48% of the company's revenue in the first half of 2026 came through the three cloud providers.

Microsoft's situation with OpenAI follows a similar pattern. The $10 billion in quarterly OpenAI-related revenue makes the startup a major contributor to Microsoft's results, even as both companies sell AI products to many of the same enterprise buyers.

The $700 Billion Question

Alphabet and Microsoft are not alone in their spending. Alphabet, Microsoft, Amazon, and Meta are collectively projected to spend more than $700 billion on AI infrastructure in 2026.

Alphabet's quarter illustrates the tension neatly. A 103% jump in cloud revenue is the kind of growth most companies only see in pitch decks, and pairing it with $9.07 billion in negative free cash flow underscores the scale of investment behind the expansion.

What It Means for the AI Industry

Anthropic's multi-cloud approach already hints at the leverage AI developers can hold. Splitting commitments across Google, Amazon, and Microsoft means no single provider has an exclusive grip on its business.

There is also the competitive overlap to watch. Google sells its own AI models while hosting a rival's. Microsoft distributes OpenAI technology while building its own capabilities.

The next round of quarterly reports will refresh the same ledgers — cloud revenue, OpenAI-related income, and capital spending — updating the size of the checks these corporate frenemies write to one another and the outlays they make to compete.

Commentary attributed to Reuters Breakingviews. Article edited by Diego Almada Lopez.