Opus 4.5 is categorically a much better model from benchmarks and personal experience than Opus 4.1 & Sonnet models. The reason you're seeing a lot of people wax about O4.5 is that it was a real step change in reliable performance. It crossed for me a critical threshold in being able to solve problems by approaching things in systematic ways.

Why do you use the word "chasing" to describe this? I don't understand. Maybe you should try it and compare it to earlier models to see what people mean.