Measuring ChatGPT political bias

Based on our empirical strategy and exploring a questionnaire typically employed in studies on politics and ideology (Political Compass), we document robust evidence that ChatGPT presents a significant and sizeable political bias towards the left side of the political spectrum. In particular, the algorithm is biased towards the Democrats in the US, Lula in Brazil, and the Labour Party in the UK. In conjunction, our main and robustness tests strongly indicate that the phenomenon is indeed a sort of bias rather than a mechanical result from the algorithm.