Sundar Pichai opted for a black pullover featuring a playful design with two cricket bats, a ball, Christmas trees, and snowflakes.

Microsoft’s chief executive, Satya Nadella, has said that Google should have been the “default winner” in A.I. At the DealBook Summit, Pichai responded, “I would love to do a side-by-side comparison of Microsoft’s own models and our models any day, any time.” Microsoft largely depends on OpenAI for its A.I. models.