What's remarkable on Grok's part is when it spends five minutes churning through a few thousand lines of code (not the whole codebase, just the relevant files) and correctly arrives at the correct root cause of a complex bug in one shot.
Grok as a model may or may not be uniquely amazing per se, but the service's eagerness to throw compute at problems that genuinely demand it is a superpower that makes at least makes it uniquely amazing in practice. By comparison, even Gemini 3 often returns lazy/shallow/wrong responses (and I say that as a regular user of Gemini).