Online encyclopedias are central to contemporary information infrastructures and have become focal points of debates over ideological bias. Wikipedia, in particular, has long been accused of left-leaning bias, while Grokipedia, an AI-generated encyclopedia launched by xAI, has been framed as a right-leaning alternative. This paper presents a comparative analysis of Wikipedia and Grokipedia on well-established politically contested topics. Specifically, we examine differences in semantic framing, political orientation, and content prioritization. We find that semantic similarity between the two platforms decays across article sections and diverges more strongly on controversial topics than on randomly sampled ones. Additionally, we show that both encyclopedias predominantly exhibit left-leaning framings, although Grokipedia exhibits a more bimodal distribution with increased prominence of right-leaning content. The experimental code is publicly available.

翻译：在线百科全书是当代信息基础设施的核心，并已成为意识形态偏见争论的焦点。特别是维基百科，长期以来被指责存在左倾偏见，而由xAI推出的AI生成百科全书Grokipedia则被塑造成右倾的替代品。本文对维基百科和Grokipedia在公认的政治争议话题上进行了比较分析。具体而言，我们考察了语义框架、政治倾向和内容优先级方面的差异。我们发现，两个平台之间的语义相似性随着文章章节的推进而衰减，且在争议话题上的分歧比随机抽样话题更为显著。此外，研究表明两部百科全书主要呈现左倾框架，但Grokipedia表现出更明显的双峰分布，其右倾内容的显著性有所增强。实验代码已公开提供。