I would think GPT4 probably could have done this.

The first React tutorial I ever did was making a hacker news clone.

It is incredibly well represented in the training data. I am just surprised how many people here obviously must barely use the models to be either overly impressed by this or think it is fake.

Gemini can do WAY more than this.

I can believe. But such texts are not patches to a crufty legacy codebase, they are fun to craft by hand! :)