In the season 4 renewal announcement, Erin Underhill, president of Universal Television, said, "Thanks to [Fellowes] and the phenomenally talented cast and crew, each season of The Gilded Age delivers stories rich in drama and history, stellar performances and stunning production value."

HBO confirmed on July 28, 2025, that there would be a Season 4 (only days before the finale for season 3), which generated excitement about what was expected next. HBO announced, "the series is one of television's most irresistible dramas," and commended Fellowes' insight into the art of marrying historical storytelling with contemporary relevance.

The penultimate episode of the third season of The Gilded Age ended not with the clang of a champagne glass, but with a bang (quite literally) when the Russell family patriarch found himself on the receiving end of a gun moments before the credits rolled.