Cheers erupted from the teams lining the sides of the field. The Files of Kicks had just scored an equalizing goal, propelling their team into contention for the final game. It was April 30, 4:30 p.m.

Last month Perplexity announced the confusingly named “Computer,” its cloud-based agent tool for completing tasks using a harness that makes use of multiple different AI models. This week, the company ...