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There's a subtle but meaningful shift in investors' sentiment regarding artificial intelligence.

The simple act of spending big on AI used to be enough to get investors excited. Tech companies spent big on AI last year and are upping those commitments this year to more than $700 billion, promising that the investments will eventually pay off. And by all indications, spending will increase even more next year.

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But eventually may no longer be good enough.

The latest round of tech earnings suggests investors want to see tangible results from all that AI spending. Microsoft (NASDAQ: MSFT) and Amazon (NASDAQ: AMZN) were rewarded after showing strong growth from their cloud businesses; Palantir Technologies(NASDAQ: PLTR) stock jumped after it demonstrated booming demand for its AI software. All three saw double-digit jumps in stock price after earnings.

Meanwhile, investors were far less forgiving of Meta Platforms (NASDAQ: META), Alphabet (NASDAQ: GOOGL) (NASDAQ: GOOG), and Tesla (NASDAQ: TSLA) as questions mounted about their enormous AI investments.

The AI boom has entered the "show me" phase. And it could have major implications for which AI stocks outperform from here.

Microsoft may be the clearest example of the "show me" mentality. The "Magnificent Seven" member is one of the biggest tech companies on the planet and is aggressively building out its AI infrastructure and Microsoft Azure cloud platform. Trailing twelve-month cloud revenue in the most recent quarter topped $100 billion for the first time.

But the biggest reason for investors' enthusiastic reaction to Microsoft's quarter was that it still maintained solid free cash flow despite its AI spending. Microsoft reported $19.9 billion in free cash flow for the fourth quarter of fiscal 2026. That was down 23% from a year ago, but Microsoft is forecasting it will remain free cash flow positive for fiscal 2027.

Amazon showed positive results as well. Amazon increased its total capital expense projection this year from $200 billion to $220 billion, but the investment is already paying off -- Amazon Web Services' growth was the fastest in more than four years, and its AI business exceeded an annual run rate of $25 billion. Amazon also recorded a roughly $25 billion annual run rate in its chips business.

Palantir isn't a hyperscaler, but it's an AI company of a different flavor. The software company's massive growth shows that clients are willing to spend on AI. Its U.S. commercial business posted triple-digit growth for the fourth consecutive quarter, and Palantir is projected to achieve 134% growth in that segment for the full year.

Alphabet is the other "Big Three" hyperscaler after Amazon and Microsoft, but its earnings report was viewed with more concern. While the company saw cloud revenue jump to $24.8 billion, Alphabet also reported negative free cash flow for the first time. Coupled with the company's plans to increase capex spending from $185 billion to $200 billion, investors shrank away from the stock after earnings.

Meta and Tesla have bigger problems, in my opinion. Both companies have ambitious visions driven by their CEOs, but they appear to be a long way from achieving those goals. Meta's Mark Zuckerberg has his company spending heavily to achieve the company's vision of bringing free AI assistants and "superintelligence" to the masses. Tesla's Elon Musk is focused on Optimus robots and full self-driving (FSD) technology -- efforts that are shrinking margins and forcing the company into negative free cash flow territory.

Both Meta and Tesla could be big winners down the road with their visionary ambition, but getting there will be expensive, and judging by the companies' post-earnings stock performance, investors are skeptical about the road ahead.

Investors are showing that in this era of AI expansion, it takes more than talk and a big checkbook. They want to see results. Amazon and Microsoft's success shows that investors aren't objecting to massive AI spending. Palantir's gains prove there's a huge opportunity for software revenue from companies that can help clients use AI effectively.

The "show me" phase of the AI boom will reward companies that can demonstrate concrete growth that justifies spending and development. For investors, the best AI stocks to buy will be those that focus on growth and cash flow.

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Patrick Sanders has positions in Palantir Technologies. The Motley Fool has positions in and recommends Alphabet, Amazon, Meta Platforms, Microsoft, Palantir Technologies, and Tesla. The Motley Fool has a disclosure policy.

Has Wall Street Entered the "Show Me" Phase of AI? was originally published by The Motley Fool