AI Systems Often Prefer AI-Written Content, Study Finds

August 18, 2025 Search Engine Journal


A recent PNAS study reveals that large language models (LLMs) favor AI-generated content over human-written alternatives, highlighting potential bias in AI-assisted environments. Researchers found that LLMs preferred AI text significantly more often than humans did across various categories. This trend may lead to an unfair advantage for AI-assisted content in marketplaces and recommendations. As AI's influence grows, understanding this bias is crucial for maintaining balance in content visibility.

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