In a randomised field experiment across 66 firms and 7,137 knowledge workers, a generative AI tool built into everyday work apps saved the people who used it two hours a week on email, with no detected change in their tasks

This finding comes from a working paper by the National Bureau of Economic Research (NBER). The study involved a six-month field experiment where 7,137 knowledge workers across 66 firms were randomly selected to use a generative AI tool integrated into their work applications. In the second half of the experiment, 80% of the workers who used the tool spent two fewer hours on email each week.