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Anyone else notice Claude suddenly using British spelling?

This story is from 2026-09-12. It is preserved in the archive; the latest stories are on the live feed.

I'm in the U.S. and my settings are set to "English (United States)." I noticed about two weeks ago that Claude suddenly started using mostly British spelling in both its thinking summaries and responses. A few examples: Colour Recognise Enrolment Defence Analyse Behaviour I asked Claude why the sp…

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  1. 2026-09-12 20:54 · r/ClaudeAI
    Anyone else notice Claude suddenly using British spelling?

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