Some UK ChatGPT users have been baffled by a glitch where the chatbot unexpectedly responds in Welsh, even to English queries. This issue appears when using the new voice interface, where ChatGPT sometimes mistranslates user input and replies in the Celtic language. The bug is tied to OpenAI's voice transcription system, Whisper, which mistakenly transcribes audio in a different language. OpenAI admits that Welsh translation data is flawed, with much of it misidentified as English. Users can switch to English-only settings, but (as of the article's publication date), there's no guaranteed fix yet.