Why is Claude preferred by lots of professionals compared to GPT?

I'm seeing a lot of posts where Claude Opus solves a previously unsolved problem in mathematics or where Opus finds a vulnerability that hadn't been discovered before in a popular application, or similar breakthroughs. It seems professionals tend to prefer Opus for this. Terence Tao, for example, uses it. Donald Knuth recently published this where he mentioned Opus was instrumental in solving an open problem he himself was working on. And agents usually use Claude too.