If you talk to free chatgpt, sure.
But if you launch Opus 5.5 in claude code - for some reason Opus is the smartest for me, even for "general" type of questions, when launched from Claude Code. It has harness/prompts optimized for correctness, while more "customer-grade" products, even when used with top model tend to optimize for latency. And I tend to give "context" - e.g. I have "personal wiki" + skills for lots of those things.
I don't recall i last few weeks where Opus 5.5 in CC made an obvious lie, made an unreasonable assumption, or made a mistake that smart human couldn't make. E.g. if it "failed" it failed in a way that non-genius human could fail in similar way.