Neutrality is difficult to achieve and, in politics, subjective. Traditional
media typically adopt an editorial line that can be used by their potential
readers as an indicator of the media bias. Several platforms currently rate
news outlets according to their political bias. The editorial line and the
ratings help readers in gathering a balanced view of news. But in the advent of
instruction-following language models, tasks such as writing a newspaper
article can be delegated to computers. Without imposing a biased persona, where
would an AI-based news outlet lie within the bias ratings? In this work, we use
the ratings of authentic news outlets to create a multilingual corpus of news
with coarse stance annotations (Left and Right) along with automatically
extracted topic annotations. We show that classifiers trained on this data are
able to identify the editorial line of most unseen newspapers in English,
German, Spanish and Catalan. We then apply the classifiers to 101
newspaper-like articles written by ChatGPT and Bard in the 4 languages at
different time periods. We observe that, similarly to traditional newspapers,
ChatGPT editorial line evolves with time and, being a data-driven system, the
stance of the generated articles differs among languages.

使用真实新闻机构的评级，我们创建了一份多语言新闻语料库，其中包括粗略的立场注释（左翼和右翼）以及自动提取的主题注释。我们展示了使用这些数据训练的分类器能够识别英语、德语、西班牙语和加泰罗尼亚语中大部分未见过的报纸的编辑立场。我们随后将这些分类器应用于 ChatGPT 和 Bard 在四种语言中撰写的 101 篇类似报纸文章，并观察到，类似传统报纸，ChatGPT 的编辑立场会随着时间而演变，并且作为一个数据驱动的系统，生成的文章在不同语言中的立场也有所不同。