Google spent $51bn in one quarter while AI Mode earned less per search

Alphabet spent $51.3bn on capital investment in the third quarter, helping push free cash flow to negative $9.1bn from negative $5.9bn in the previous quarter. The company now expects as much as $205bn of full-year capital expenditure and has disclosed more than $1tn of future commitments, according to the Financial Times. Its shares fell more than 10% after hours.

The results were not a demand collapse. Revenue rose 25% to $127.6bn, while Google Cloud revenue more than doubled to $30.7bn. Search and related advertising still grew 12% to roughly $63.4bn. The tension is that those gains missed expectations at the same time the infrastructure bill accelerated. Net income fell 25% to $26.2bn, though an $8.7bn paper loss on equity investments explains an important part of that decline.

Management acknowledged the transition inside search. AI Mode queries are longer and many are incremental, but the format currently monetizes at a lower rate than traditional search. Google is expanding ads in AI Overviews and AI Mode, including multi-turn ads, and argues that better user experience should come before full monetization. That may be strategically sound; it also means the company is spending more compute per interaction while earning less advertising revenue per interaction during the migration.

Cloud growth offers a second route to a return: Google's TPUs and data centers sell the same AI demand that creates its own capital burden. But cloud revenue is not equivalent to free cash flow, and today's build-out also creates future depreciation, power and financing costs. The more revealing comparison is Microsoft, which generated $18.6bn of free cash flow despite $45.2bn of capital spending and received a positive market reaction.

Google's problem is therefore not whether AI produces usage. It is whether the company can convert longer, computationally expensive answers into enough high-margin revenue before the new infrastructure and commitments overwhelm the cash generated by the old search model. This quarter is the clearest evidence yet that the transition has reached the financial statements rather than remaining a product narrative.