[klipt]

I assume ChatGPT can spell the UK way if carefully prompted. Its training corpus surely includes both spellings.

[pixl97]

Yes, it appears so

>Write a short story about springtime in England. Use British English spellings when doing so.

GPT-4 went off and wrote me a book, and I don't actually know that many Brit vs US spellings, but I do see things like

...fragrant blooms and preparing colourful bouquets for the villagers....