We present a comparative analysis of Wikipedia and Grokipedia to examine how generative mediation alters content selection, textual rewriting, narrative structure, and evaluative framing in encyclopedic content. We model page inclusion in Grokipedia as a function of Wikipedia page popularity, density of reference, and recent editorial activity. Inclusion is non-uniform: pages with higher visibility and greater editorial conflict in Wikipedia are more likely to appear in Grokipedia. For included pages, we distinguish between verbatim reproduction and generative rewriting. Rewriting is more frequent for pages with higher reference density and recent controversy, while highly popular pages are more often reproduced without modification. We compare editing activity across the two platforms and estimate page complexity using a fitness-complexity framework to assess whether generative mediation alters patterns of editorial participation. To assess narrative organization, we construct actor-relation networks from article texts using abstract meaning representation. Across multiple topical domains, including U.S. politics, geopolitics, and conspiracy-related narratives, narrative structure remains largely consistent between the two sources. Analysis of lead sections shows broadly correlated framing, with localized shifts in laudatory and conflict-oriented language for some topics in Grokipedia. Overall, generative systems preserve the main structural organization of encyclopedic content, while affecting how content is selected, rewritten, and framed.

翻译：本文对维基百科与Grokipedia展开比较分析，旨在探究生成式媒介如何改变百科全书内容的内容选取、文本重写、叙事结构与评价框架。我们将Grokipedia的页面收录行为建模为维基百科页面流行度、参考文献密度及近期编辑活动的函数。收录呈现非均匀性：在维基百科中可见度更高、编辑冲突更剧烈的页面更可能出现在Grokipedia中。针对已收录页面，我们区分了逐字复制与生成式重写两种模式。参考文献密度高且近期存在争议的页面更频繁被重写，而极高流行度的页面则更常未经修改直接复制。我们比较了两个平台的编辑活动，并采用适应度-复杂度框架估算页面复杂度，以评估生成式媒介是否改变了编辑参与模式。为考察叙事组织方式，我们基于抽象语义表示从文章文本构建了行动者-关系网络。在美国政治、地缘政治及阴谋论叙事等多个主题领域中，两个来源的叙事结构基本保持一致。对导语章节的分析显示二者框架总体相关，但Grokipedia在某些主题的褒扬性与冲突导向语言上存在局部偏移。总体而言，生成式系统保留了百科全书内容的主要结构组织，同时影响了内容的选取、重写与框架构建方式。