The artificial intelligence (AI) market exploded last year and became one of the biggest growth drivers of the Nasdaq Composite's recovery. The market faced an economic downturn the previous year, which sent countless stocks plunging. However, the Nasdaq Composite is up 44% year over year and climbing, primarily thanks to excitement over AI.

According to data from Grand View Research, the AI market is projected to have a compound annual growth rate of 37% through 2030. The industry hit nearly $200 billion last year, but this trajectory would see it achieve close to $2 trillion by the decade's end. So, despite the market's meteoric rise over the last year, new investors still have much to gain from AI.

The "Magnificent Seven" stocks of the tech world -- Apple, Alphabet (GOOG 9.96%) (GOOGL 10.22%), Amazon, Meta Platforms, Microsoft, Nvidia (NVDA 6.18%), and Tesla -- are a great place to start. These companies are investing heavily in AI and have the brand power to go far in the industry. It's not too late to invest in AI, so here are two Magnificent Seven stocks to buy and hold forever.

1. Nvidia

Nvidia's business was brought front and center last year when it snapped up an estimated 90% market share in AI graphics processing units (GPUs), the chips necessary for training and running AI models. Meanwhile, competitors like Advanced Micro Devices and Intel scrambled to catch up.

Soaring demand for AI services led to a similar demand for high-powered chips, with Nvidia perfectly positioned to supply its hardware to most of the market. As a result, earnings hit record heights over the last year.

In the fourth quarter of fiscal 2024 (ended in January), Nvidia's revenue increased by 265% year over year to $22 billion. Meanwhile, operating income jumped 983% to nearly $14 billion. The monster growth was primarily from a 409% rise in data center revenue, reflecting increased chip sales.

The chipmaker's massive success in AI has also seen its free cash flow soar 430% in 12 months to $27 billion. Comparatively, AMD's is at just over $1 billion, while Intel's is negative $14 billion.

So, despite new GPU releases from both competitors, Nvidia's head start in AI potentially pushed it further ahead with greater cash reserves to continue investing in its technology and retain its market supremacy.

After a monster growth year, some analysts are questioning whether Nvidia has much more to offer. However, the significant potential of AI and the company's powerful market position means it remains an attractive long-term play.

NVDA PE Ratio Chart

Data by YCharts.

Moreover, this chart shows Nvidia's price-to-earnings (P/E) ratio and price-to-free-cash-flow plunged 45% and 48% over the last year, meaning the company's stock is trading at its best value in months.

Alongside a solid role in AI, Nvidia is a Magnificent Seven stock that is too good to pass up.

2. Alphabet

It's impossible to deny Alphabet's top spot in tech, with brands like Android, YouTube, and Google attracting billions of users worldwide. The popularity of these products enabled Alphabet to achieve a leading 25% market share in digital advertising and become the world's sixth most valuable company by market cap.

However, all eyes have been on its expanding AI efforts over the last year. At the end of 2023, the company debuted Gemini, a large language model that looked likely to make Alphabet competitive against cloud rivals Microsoft and Amazon.

Yet the Google parent's stock was down 7% in the last month after a disappointing launch for Gemini. Alphabet recently held a presentation for the new AI model, and Gemini gave inaccurate depictions of historical figures and failed to recognize key differences between other prominent figures. The blunders forced Alphabet to take its AI image services offline for now.

Despite recent failures, Alphabet remains an attractive way to invest in AI over the long haul. Last year, the company hit $70 billion in free cash flow, more than Microsoft or Amazon. The company has the financial resources to keep investing in its business and the brand power to attract users to its services.

NVDA PE Ratio Chart

Data by YCharts

Furthermore, the table above shows that Alphabet has the lowest P/E and second-to-lowest price-to-free-cash-flow of all of the Magnificent Seven. As a result, Alphabet's stock is a bargain compared to its rivals, making it a lower-risk way to invest in AI.

In addition to a range of immensely popular brands, Alphabet is one of the best Magnificent Seven stocks to buy now and hold forever.