HOW DEEP DO LARGE LANGUAGE MODELS INTERNALIZE SCIENTIFIC LITERATURE AND CITATION PRACTICES?
The spread of scientific knowledge depends on how researchers discover and cite prior work. Large language models (LLMs) now add a new layer to this process, but their alignment with human citation practices across domains remains unclear. Here, we compare human citations with GPT-4ogenerated reference suggestions produced from paper metadata and abstracts. Analyzing 274, 951 generated references for 10, 000 focal papers, we find that LLMs systematically reinforce the Matthew effect by favoring highly cited papers, with field-specific variation in the rate at which generated references match real papers in bibliometric databases. Generated references diverge from groundtruth reference lists by favoring more recent papers, shorter titles, and smaller author teams. Yet they remain semantically aligned with focal-paper content at levels comparable to human references, reproduce similar local citation-network structure, and reduce author self-citations. These results show that LLMs can generate content-relevant bibliographic suggestions from parametric knowledge alone, but that they also amplify dominant citation patterns. As such tools become routine in research workflows, they may reshape how scientific communities discover, prioritize, and build on prior work.