  Wikipedia is one of the most popular websites in the world, serving as a
major source of information and learning resource for millions of users
worldwide. While motivations for its usage vary, prior research suggests
shallow information gathering -- looking up facts and information or answering
questions -- dominates over more in-depth usage. On the 22nd of November 2022,
ChatGPT was released to the public and has quickly become a popular source of
information, serving as an effective question-answering and knowledge gathering
resource. Early indications have suggested that it may be drawing users away
from traditional question answering services such as Stack Overflow, raising
the question of how it may have impacted Wikipedia. In this paper, we explore
Wikipedia user metrics across four areas: page views, unique visitor numbers,
edit counts and editor numbers within twelve language instances of Wikipedia.
We perform pairwise comparisons of these metrics before and after the release
of ChatGPT and implement a panel regression model to observe and quantify
longer-term trends. We find no evidence of a fall in engagement across any of
the four metrics, instead observing that page views and visitor numbers
increased in the period following ChatGPT's launch. However, we observe a lower
increase in languages where ChatGPT was available than in languages where it
was not, which may suggest ChatGPT's availability limited growth in those
languages. Our results contribute to the understanding of how emerging
generative AI tools are disrupting the Web ecosystem.
