What is the biggest driver of AI CapEx today?

 title: 'Years to 50% Adoption of Household Technologies in USA, per Morgan Stanley'

The bulk of spending in AI large language model (LLM) development is still dominated by compute, specifically, the compute needed to train and run models[1]. Training costs remain extraordinarily high and are rising fast, often exceeding $100 million per model today[1].

Even as the cost to train models climbs, a growing share of total AI spend is shifting toward inference, the cost of running models at scale in real-time[1]. As inference becomes cheaper, AI gets used more[1]. And as AI gets used more, total infrastructure and compute demand rises, dragging costs up again[1].