Mercedes dominated the 2020 season by winning 13 out of 17 races, including 11 victories for world champion Lewis Hamilton.
Red Bull finished a distant second with two wins for Max Verstappen, but caught up in 2021 which led to the most dramatic title showdown in recent memory.
Red Bull won all but one race in 2023, as Verstappen romped home to his third consecutive world title. Meanwhile, the team switched its development focus to 2024 in the summer, which has led to pessimism from rival teams that it can be caught next year.
When asked why he thinks anyone can catch Red Bull next year, Horner replied: "We saw that in 2020 with Mercedes. If you remember, that was their most dominant year ever and yet, we were able to beat them in ’21.
"There is a subtle rule change but I think that nothing stands still. We’ve seen competitors coming closer at different venues and I’m sure concepts will converge.
“Stable regulations always concertina. I don’t think we’ll ever be able to repeat the season that we’ve had, but hopefully, we can take the lessons from RB19 and apply them to [RB]20 and come up with a car that we can defend these titles with."
Source: Autosport