Amazon (NASDAQ:AMZN) just gave security teams a fresh reason to watch its cloud business. On August 11, two specialized cybersecurity models from OpenAI, Daybreak Red and Daybreak Blue, went live on Amazon Bedrock for eligible customers, and AWS’s own security teams are already using them to find and fix vulnerabilities faster. It’s the latest step in a partnership that keeps expanding, and it lands just as investors are debating whether Amazon’s spending spree will pay off.
Bull Case: AWS Is Quietly Becoming An AI Machine
The Daybreak launch caps months of buildout. Earlier on April 28, Amazon and OpenAI announced a major expansion of their partnership, bringing OpenAI models, the Codex coding agent, and Bedrock Managed Agents to AWS in limited preview, wrapped in the enterprise controls big customers already use, including IAM access management, AWS PrivateLink, and CloudTrail logging. By July 9, GPT-5.6 Sol, Terra, and Luna reached general availability on Bedrock, with Terra priced at half the cost of GPT-5.5 and a 90% discount on cached inputs. Codex already has more than 4 million weekly users, and now it runs inside the AWS environments those customers already operate at scale.
The financial results back up the momentum. AWS revenue grew 37% year-over-year last quarter, the fifth straight quarter of acceleration and the fastest pace in 18 quarters, even though the business has doubled in size over that stretch. Amazon’s AI services and its custom chip lineup, Trainium, Inferentia, and Graviton, each crossed a $25 billion annualized run rate and are both growing at triple-digit rates. Behind that sits $496 billion in contracted revenue, including deals to supply OpenAI with 2 gigawatts of Trainium capacity and Anthropic with up to 5 gigawatts of Trainium and Graviton over a 10-year agreement. Retail is contributing too, with advertising revenue up 26% year over year and online store sales up 15%.
Bear Case: Building That Much Infrastructure Isn’t Free
Amazon now plans to spend $220 billion on capex this year, up from a $200 billion estimate just one quarter earlier and well above the $132 billion it spent in 2025. Part of that increase traces to memory chip prices, which have spiked amid a shortage. The spending has pushed free cash flow to negative $7.6 billion over the trailing 12 months, a sharp reversal from the positive $18.2 billion generated a year earlier, and long-term debt has climbed 96% to nearly $129 billion.
That kind of spending increase leaves less room for error if it doesn’t convert into earnings growth. The bigger risk isn’t that Amazon or its AI partners can’t pay their bills; it’s that hyperscalers collectively build more data center capacity than the market needs, which would pressure pricing industry-wide. Amazon does have some flexibility here, since server orders typically carry a lead time of just a few months and a payback period under three years. Jeff Bezos also sold more than $4 billion worth of shares, a transaction reportedly planned eight months, though the timing still rattled some investors.
Wall Street’s Mixed Signals
Hedge fund ownership dropped from 381 funds to 353 in the most recent quarter, a pullback suggesting some institutional holders trimmed their positions. Short interest, by contrast, sits at just 1% of the float, showing little organized skepticism toward the stock. As of August 12, Amazon trades at 23.70 times forward earnings, a multiple that assumes real profit growth ahead. Put those signals together, and the picture is mixed: funds pulling back even as short sellers stay away and the market keeps paying a premium.
Where This Leaves Amazon Investors
Amazon’s cloud business is accelerating at a pace it hasn’t shown in years, and the OpenAI partnership adds another lever as enterprises adopt AI tools. That growth is coming at a cost, with capital spending pushing free cash flow sharply negative and debt climbing quickly. The newer AI and chip segments becoming real revenue contributors is the clearest sign the investment is starting to pay off.
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