User asks Claude in English, its chain of thought runs in Polish
Far_Designer2131 · reddit · 2026-09-30
A Reddit user shared a bizarre Claude moment: prompted in English, the model ran its entire chain of thought in Polish before replying in English. "Looks like my Claude is having bipolar disorder," the user joked. The screenshot sparked discussion about why models sometimes switch languages mid-reasoning.
Related event: Claude Caught Thinking in Polish When Answered in English(2 posts)→
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