McKinsey: What does AI really cost? The cost of running agents under usage-based pricing

By McKinsey & Company · Wed, 21 Oct 2026 16:13:00 +0000.

McKinsey has published an explainer video (part of its McKinsey Explainers series) titled «What does AI really cost?», focused on how to measure and maximize the value of AI. The email argues that as generative AI moves from pilots into everyday work, answering the question of what it really costs has become harder.

The starting point the email highlights is a shift in pricing model: according to McKinsey, in 2026 AI providers have moved to consumption-based pricing, so companies now pay for every request a model handles. The email warns that with more agents than ever, and increasingly complex ones, those requests can add up quickly.

In the video, McKinsey experts Lari Hämäläinen, Wasim Lala and Kaavini Takkar explain why AI bills keep rising and what it takes to run an AI agent. They illustrate this with examples from their client work.

The specific example cited in the email is a bank whose projected AI spending jumped from $3 million a year to more than $25 million once employees were given access to every tool and model without any guardrails. The implicit lesson is that governance of access and consumption is key to containing costs.

The email also invites readers to explore the McKinsey Explainers series for other complex questions, and notes that readers can submit their own questions to [email protected].

As industry context, the move to consumption-based pricing means the cost of agentic systems depends on the number of model calls, so agent design and usage limits directly affect the bill. The email, however, only provides these figures in summary form and refers readers to the video for details; it includes no further figures or methodology.