Citadel Securities reports a potential shift in AI adoption as high compute and inference costs lead to a bifurcation between frontier and "everyday" AI usage. Data from the Silicon Data LLM Expenditure Index shows a recent decline, which may reflect a market transition toward cheaper, more efficient models due to rising sensitivity to the "all-in cost" of AI tokens. The analysis notes that major players like Amazon and Microsoft have already adjusted their offerings, such as removing token leaderboards or cancelling specific subscriptions, in response to these cost constraints.