Amazon is showing both sides of the AI buildout.
AWS is accelerating. In Q2 2026, AWS revenue rose 37% year over year to $42.2 billion. That puts the business at a $169 billion annualized revenue run-rate.
The cash flow picture looks different.
Amazon’s trailing twelve-month operating cash flow rose 33% to $161.4 billion. Free cash flow still moved from an inflow of $18.2 billion in the trailing twelve months ended Q2 2025 to an outflow of $7.6 billion in the trailing twelve months ended Q2 2026.
The reason is capex.
Amazon said free cash flow decreased primarily because purchases of property and equipment, net of proceeds from sales and incentives, rose by $66.1 billion year over year. The company said that increase primarily reflects investments in artificial intelligence.
That is the AI tradeoff in one earnings release.
Revenue is scaling. Infrastructure spending is scaling too.
For investors, Amazon’s numbers are a useful reminder that AI demand does not show up only as cloud revenue. It also shows up as data centers, servers, chips, networking equipment, power capacity, and long-lived infrastructure that has to be paid for before it earns a full return.
AWS is still a huge profit engine. Segment operating income rose 64% year over year to $16.6 billion in Q2. The business is growing faster than it has in years.
But the capital intensity of AI is changing the cash-flow profile.
The research question is whether this spending produces enough durable demand to justify the size of the buildout. If AI workloads keep growing, Amazon may be front-loading infrastructure for a larger AWS revenue base. If demand becomes more uneven, investors will spend more time questioning returns on AI capex.
For now, Amazon’s Q2 report says the same thing as several other AI infrastructure charts: the buildout is real, and it is expensive.