The US economy just hit the gas. The Fed is eyeing the brakes.

The US economy accelerated in the third quarter. Real GDP grew at a 3.4% annual rate from July to September, the Bureau of Economic Analysis said on Thursday, up from 2.2% in the spring and ahead of the 3.2% economists polled by Reuters expected. Without annualizing, output rose about 0.8% in the quarter.

The inflation side of the report looked better too. But for a Federal Reserve that has been raising rates, a fast-growing economy is not entirely good news.

Real GDP, annualized quarterly growth, percent

Show the numbers

	Real GDP growth
Q1 2026	2.5%
Q2 2026	2.2%
Q3 2026	3.4%

Source: BEA, GDP advance estimate Q3 2026 and third estimate Q2 2026

What drove the growth

According to the BEA, growth came from investment, consumer spending and government spending, partly offset by lower exports and higher imports.

• Investment: led by companies building up inventories, mainly in wholesale and manufacturing, and by equipment, especially computers and peripherals.
• Consumers: spending rose on both services and goods, led by health care, restaurants and hotels, and prescription drugs.
• Government: federal spending rose, but mostly because the government sold less oil from the Strategic Petroleum Reserve than in the spring. The BEA notes that this has no direct effect on GDP.
• Trade: exports fell, led by petroleum products, while imports rose, led by capital goods. Imports are subtracted from GDP, so they held growth back.

A cleaner gauge of underlying demand, real sales to private domestic buyers, which strips out inventories, trade and government, grew 4.9%, up from 4.6%. That is strong by any standard.

Where AI shows up

The equipment surge is where the AI build-out appears in the data. On Wednesday alone, Alphabet reported $51.4 billion of quarterly capital spending and Microsoft $39.4 billion in cash, much of it on servers and data centers. Amazon and Meta are spending on a similar scale.

Not all of that counts as US growth. Many AI chips and servers are imported, and imports are subtracted from GDP. Before the release, economists polled by Reuters expected a wider trade gap, driven by record imports of AI-related equipment, to knock around four points off growth, with domestic AI investment offsetting part of it. The BEA does not publish a separate figure for AI.

That is the same tension running through Big Tech’s results. AI spending creates economic activity today: construction, power equipment, chips and servers. Whether it earns an adequate return for the companies paying for it is a question that takes years to answer.

Inflation cooled, but not as much as it looks

The quarterly price figures were the friendliest part of the report. The PCE price index, the Fed’s preferred inflation measure, rose at a 2.1% annual rate, down from 5.0% in the spring. The core measure, which excludes food and energy, slowed to 2.5% from 3.3%.

PCE price index, annualized quarterly change, percent

• Headline PCE
• Core PCE

Show the numbers

	Headline PCE	Core PCE
Q1 2026	4.2%	3.9%
Q2 2026	5%	3.3%
Q3 2026	2.1%	2.5%

Source: BEA, GDP advance estimate Q3 2026 and third estimate Q2 2026

Two caveats matter. First, these are annualized rates for a single quarter, and the spring was unusually hot, so part of the slowdown is a comparison with a bad quarter. Second, inflation over the past year is still well above the Fed’s 2% target: the latest year-over-year readings, for August, put headline PCE at 3.4% and core at 3.0%.

Why the Fed may not relax

The Fed raised rates in September and on Wednesday held its benchmark range at 3.75% to 4.00%. Two of 12 voters wanted another increase. The Fed’s statement upgraded growth to a “strong” pace and said inflation “remains elevated.” Before Thursday’s data, futures priced about an 85% chance of a hike at the December 8–9 meeting.

The report gives both sides something to work with:

• The case for another hike: private demand is growing close to 5%, well above the roughly 2% pace Fed officials see as consistent with stable prices, and year-over-year inflation is still above 3%.
• The case for waiting: quarterly inflation slowed sharply, and core PCE at a 2.5% annual rate is the closest the Fed has come to its target this year.

What it means for stocks

A faster economy supports company revenues, and slower quarterly inflation is welcome news. The risk is the other side of the same coin: strong growth keeps the Fed leaning toward higher rates, and the 10-year Treasury yield was already around 5% on Wednesday. High yields put the most pressure on expensive growth stocks, including the AI names whose spending is helping to drive the numbers.

In other words, a strong economy and a strong stock market are not the same thing. What matters for share prices is whether profits keep up with the spending, and whether rates stop rising.

What to watch

• Thursday, October 29: Amazon reports after the US market closes, with AWS growth and its spending plans the key numbers.
• December 8–9: the Fed’s next meeting, where markets expect a rate hike.
• November 25: the second GDP estimate, with the first look at third-quarter corporate profits, and October inflation data.

For now, the US economy is getting a lift from the AI build-out and from consumers who keep spending. The question for investors is whether the Fed sees that strength as a reason to stop raising rates, or a reason to keep going.