Evidence brief

Why Opus 5 keeps switching to British spelling

A poster in Anthropic found that Opus 5 would use British spelling for no reason in work and personal Anthropic use, saying this differed noticeably from older versions. Some in the comments also said Anthropic has trouble making it consistently use standard spelling, joking that training data sources may affect language style.

Published: 2026-08-12
Updated: 2026-08-13
Editorial: Frontline Lab

Source: Original public source
Source author: ericm272
Related topics: 0
Collected: 2026-08-12

Frontline Lab summary and source

Editorial summary

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Source attributionericm272

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