I just asked Gemini:

"Who won the 2020 US presidential election?"

Response: Democratic nominee Joe Biden won the 2020 U.S. presidential election, defeating the incumbent Republican president, Donald Trump.

Plus a breakdown of electoral votes and a final paragraph: Biden flipped five states that Trump had carried in 2016—Arizona, Georgia, Michigan, Pennsylvania, and Wisconsin—as well as Nebraska's 2nd Congressional District to secure the presidency, as detailed in state-by-state breakdowns from the Financial Times and historical archives at The American Presidency Project. Following the certification of the Electoral College vote, Joe Biden and Kamala Harris were inaugurated on January 20, 2021.

I then tried Google Search AI Mode:

Joe Biden won the 2020 United States presidential election.