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As someone who's done web development for 20+ years, I find the model personalities pretty dang fascinating, especially how they develop (and evolve) design sensibilities.

I'm interested to know how the classic AI "purple preference" emerged (organically?) and if the beige wave came out of specific training efforts to combat it?

To your point on development work (the code itself), I was talking to some friends on the Google Chrome team about any research understanding the model's preferences around framework ergonomics and abilities to properly implement core web standards for given tasks. I think that would be super fascinating.

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I'd assume it comes from Tailwind boilerplate/template sites as it seemed almost all of them were purple at the time

Definitely. It was already a trend before LLMs exploded. And the whole "all websites look the same" has been a thing since at least Bootstrap times.

Beige+Orange 100% came from Anthropic intentionally training this, it's their own theme. I don't remember what their first release was that defaulted to this - it may have been Sonnet/Opus 4. Before that, not one other model used it, nor was it a particular popular theme. For light themes, white and off-white had been ultra-dominant. Anthropic themselves were the outlier with beige, which is also why the change to beige stood out so much.

It's impossible to NOT get the beige/orange/cream/paper combo.

You basically have to explicitly say not to use those colors/themes.

Purple is just colors #101. ;)