What kind of coding/tasks?
I find all of the main ones, including the Chinese ones, to be basically on par.
Enterprise programming (CRUD all the way down, not simple one though, full ERP)
Just ask Opus and Kimi to build a game about something random, like "make a Mario Kart-inspired game." Opus gives better results most of the time. That doesn't mean you can't get your particular job done with either of these models.