Alphabet Outpaces Nebius in AI Cloud Dominance

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The global cloud AI market is expected to expand rapidly in the coming years, benefiting both Alphabet and Nebius. However, Alphabet's diversified business model, scale, and advanced AI capabilities position it as the stronger and more sustainable investment compared to the capital-intensive and execution-dependent Nebius.

Why it matters

The competition between Alphabet and Nebius in the AI cloud market is a key battleground, as both companies seek to capitalize on the surging demand for cloud-based AI services. The outcome of this rivalry will have significant implications for the broader AI infrastructure landscape and the fortunes of investors in these two tech giants.

The details

Nebius' core AI cloud business delivered exceptional results in Q4 2025, with revenue surging 830% year-over-year and 63% sequentially. However, Nebius faces execution risks due to its aggressive expansion plans, which involve investing $16-$20 billion in capex in 2026. In contrast, Alphabet is leveraging its diversified business model, advanced AI capabilities, and strong developer adoption to maintain leadership in AI cloud services and drive enterprise adoption. Alphabet's advertising revenues, which accounted for 73.2% of total revenue in 2025, remain exposed to fluctuations in advertiser spending, and the company also faces regulatory scrutiny and rising costs.

• In Q4 2025, Nebius' AI cloud revenue surged 830% year-over-year and 63% sequentially.
• In 2025, Alphabet's advertising revenues rose 11.4% year-over-year to $294.69 billion, fueled by gains in Search and YouTube ads.
• In Q4 2025, revenues from products built on Alphabet's generative AI models grew more than 400% year-over-year.