Comment by jacquesm

No. I've had pretty much every model I've worked with (list too long to recite) spit out the odd Chinese, Korean, Thai or other Asian chunk of letters from time to time. ChatGPT in various incarnations has suddenly switched to Chinese in mid-output and remained that way until told to switch back. The only one I haven't really seen this from as far as I can recall is Gemini, but then again, I haven't used it as much because it was performing quite poor for what I was doing.