It's been an odd year for Amazon (AMZN +1.19%) investors so far. In early January, the stock popped roughly 7% to $247 per share -- just inches away from notching a new all-time high. But over the last month, Amazon stock has been sliding -- now down about 14% on the year as software stocks continue to plummet.

Let's dig into the driving forces behind Amazon's sell-off. From there, I'll detail why smart investors view this dip as a generational buying opportunity.

Why Amazon's $200 billion AI budget is worth it

Prior to Amazon's fourth-quarter earnings call on Feb. 5, Wall Street was expecting management to guide for capital expenditures of about $150 billion for this year. Spoiler alert: Amazon plans to spend $200 billion, far more than investors were expecting.

As Amazon continues to pour money into procuring GPUs from Nvidia, designing its own custom silicon, and building AI data centers, the company's free cash flow generation will decelerate. The combination of accelerating infrastructure spend and diminishing cash flow is what's causing investors to dump Amazon stock right now.

Here's what investors are missing: During the fourth quarter, Amazon Web Services (AWS) generated $35.6 billion in revenue -- representing 24% growth year over year. This is the highest growth from AWS in 13 quarters, and data suggests the ride is just getting started. Backlog from AWS sits at a whopping $244 billion -- up 40% year over year and an impressive 22% from the third quarter.

Importantly, AWS is a high-margin business for Amazon. While the company's profitability in the e-commerce division can experience pronounced swings due to seasonality and fluctuations in consumer buying patterns, AWS remains more resilient -- often generating operating margins in the mid-30% range.

The consistency of AWS's profit margins is what fuels robust cash flow for Amazon -- providing the company with a high degree of financial flexibility to reinvest in the business, as it's doing now.

Beyond LLMs: How Anthropic is turning Amazon into an AI ecosystem

One of the biggest contributors to the AWS renaissance is Amazon's relationship with Anthropic. Anthropic's Claude model is heavily integrated throughout the AWS ecosystem, particularly in a product called Amazon Bedrock.

Moreover, Anthropic is also leveraging Amazon's custom Trainium and Inferentia chips. By partnering closely with a leading enterprise AI system and designing its own infrastructure, Amazon is quietly building a cost-efficient, vertically integrated AI stack.

This strategy helps Amazon move beyond the world of basic chatbots and win over sophisticated, data-heavy enterprise workflows.

Is Amazon's pullback a buying opportunity?

I think most investors are overlooking the fact that Amazon is already bearing fruit from its AI-related investments. In my eyes, it makes complete sense for the company to double down and increase its infrastructure spend.

While there may be a lag between the initial capital outlay and a meaningful return on investment for these buildouts, the evidence is already clear: AWS is becoming more than a capacity service, and the combination of Anthropic and custom silicon serves as strategic assets for Amazon's AI ecosystem.

AMZN PE Ratio data by YCharts

Nevertheless, the software bear market has brought Amazon stock to its cheapest levels during the entire AI revolution based on price-to-earnings (P/E) trends.

I think Amazon is a no-brainer buy at this price point. The stock is heavily discounted relative to the company's upside potential, making it a compelling opportunity to buy and hold as the AI movement continues to benefit the hyperscaler.