How fast is AI revenue growing relative to investment?
Core argument: The authors' proprietary model estimates monthly AI revenue rose from $772 million in January 2024 to $13.8 billion in December 2025, roughly an eighteen-fold increase in two years, with hyperscalers as the main engine.
According to our proprietary model, monthly AI revenue grew from $772 million in January 2024 to $13.8 billion by December 2025, roughly an eighteen-fold increase in two years. The hyperscalers are the main engine. Our revenue model estimates that AI now accounts for 23% of Google Cloud’s business, 10% of Azure’s (the biggest of which is from OpenAI) and 5% for AWS’s as of the latest quarter. The ratio of investment to revenue – what we call Industry Strain – has dropped from 6.1x to 4.7x in five months. If Industry Strain remains high for sustained periods of time, it means that companies are not recouping their investments, and they are building speculatively. For context, the telecoms bubble peaked at an Industry Strain of just over 4x. In the case of generative AI, strain is still at historically high levels. On our dashboard, it sits in the amber zone. But the trajectory matters: if it holds, the ratio drops below our 3x threshold by Q2 this year. It would signal that revenues are beginning to “carry” the installed base and that the balance sheets and external financing can stop doing the heavy lifting. The question for us has moved from “Are we in a bubble?” to whether there is enough compute to withstand the agent stampede.



