This paper takes stock of official statistics on AI use in firms collected through ICT usage surveys. Its aim is to highlight statistically sound data that can be used to guide policymakers and other stakeholders in the complex field of AI. It provides a cross-country comparison of official AI measures in selected OECD countries and international organisations by reviewing the statistical AI definitions developed explicitly for measurement purposes as well as the AI questions in official ICT use surveys. Based on the results of these surveys, the paper provides an international comparison of AI uptake among firms. It also includes a brief overview of smaller-scale non-official measures of AI, which can complement official statistics. In its final part, it makes an initial attempt to match AI policy with the AI measures previously analysed, and highlights possible next steps. This paper is also a contribution to the OECD AI Policy Observatory.