Well done for being a good sport, but I'm willing to bet that tomorrow's shape will not resemble a unicorn and you'll have to figure out how that works with your assumption that the model is improving.

I think we're going to need to wait a few more years, at least, to see any improvement. I expect to see 4 new models a year, before GPT-5 arrives. I'll just keep using the latest model and we can all reconvene in 1, 2, 5, 10 years.

It got to a unicorn quite easily when the output was set to Tikz as I’ve done here:

https://bobjansen.net/drawing-with-chatgpt/

That looks nothing like a unicorn, but the three triangles at the top right in the third picture look like the mask of some evil manga villain alien robot.