Try a bigger code base or more complex stuff and you will easily see that the solution, speed and amount of problems Opus5.5 solves vs older models is relevant.
This works fine with Opus 5.5. But it also works fine with GPT 6.1 Sol, Kimi K3 and MiMo 2.6 Pro.
It doesn't work equally well with Sonnet 5.5, interestingly.