On September 14, Alphabet rose 3.04% in regular trading, trading at $348.86/share, with turnover of $63.29 billion. The rally was driven by a dual catalyst: compelling AI infrastructure economics disclosed by Google Cloud leadership and market speculation around a potential breakthrough at Google DeepMind.

On the news front, Google Cloud CEO Thomas Kurian revealed at the Goldman Sachs Communicopia + Technology Conference that Google Cloud's average AI server investment payback period is under two years, with its proprietary chip payback period at just half that of GPU-based solutions. Kurian further stated that Google's in-house AI accelerator business is more than twice the scale of the second-largest hyperscale data center operator. The company claims cost-performance advantages of 2.7x in AI training, 80% in AI inference, and 30% in CPU workloads, underpinned by five-year infrastructure contracts.

Meanwhile, market speculation emerged that Google DeepMind may be approaching recursive self-improvement — a critical AI milestone — further boosting sentiment. Separately, Berkshire Hathaway's large-scale investment in Alphabet on long-term AI conviction provided additional backdrop support. Google Cloud also announced general availability of Dataflow batch job pause/resume functionality and new support for NVIDIA RTX Pro 6000 Blackwell GPUs, expanding its AI hardware ecosystem.

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