Just means it's better at one specific task than the others, which has always been the case. For each of Sonnet, GPT and Gemini I can readily name a task they are individually the best at. At the same time the consensus that Sonnet 3.5 is overall the currently strongest model remains correct, and that's what most people care about. Additionally most people do tasks that all of the models perform similarly at, or they can't be bothered to optimize every task by using the best model for that one task. Which makes sense since not a single cloud provider has all three of them. Now this one will likely be AWS-exclusive too.
Benchmarks are way too easy to game. There's no shortage of models that "beat GPT-4" according to some benchmark or another, that are obviously nowhere even close when you try them on novel tasks.