Researchers show that training on “junk data” can lead to LLM “brain rot”

Ars TechnicaThursday, October 23, 2025 at 9:20:48 PM
NegativeTechnology
Researchers show that training on “junk data” can lead to LLM “brain rot”
Recent research highlights a concerning trend in the training of large language models (LLMs), revealing that those trained on 'junk data'—like short and superficial tweets—tend to perform poorly on important benchmarks. This matters because it raises questions about the quality of data used in AI training and its implications for the reliability of AI outputs, potentially affecting various applications that rely on these models.
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