Idk why, maybe sonnet 4.5 is better than other models, but it couldn't find a bug which Opus 4.1 did

Anthropic says the sonnet 4.5 is the smartest model out there outperforming opus 4.1 . I switched to newer model thinking well it should be better. However yesterday when using it sonnet has wasted my time unable finding a bug (4-5 prompts), while opus 4.1 found it with one prompt. it was a simple bug where I had to remove '_' from the string inside.

the opus 4.1 seems to be more attentive to details than sonnet . it seems sonnet is more logical, the way it writes code, what approaches uses.