AI-Powered Browsers Are Broadly Accurate News Summarizers That Reduce Political Bias and Negative Affect
For researchers and policymakers concerned with AI's impact on democratic discourse, this paper provides the first large-scale evidence that AI-powered browsers act as editorial intermediaries that systematically reshape news content.
This study audits browser-based AI summarizers (Google Chrome, Microsoft Edge, Perplexity Comet) on 13,777 articles from 15 U.S. news outlets, finding they are broadly accurate and consistently reduce political bias, negative affect, and personal tone while increasing clarity.
Web browsers now provide AI-generated news summaries for millions of users. Despite their popularity and influence, we lack a systematic understanding of how these systems transform news before people read it. Through a large-scale audit, we investigate the factual accuracy of browser-based AI summarizers and how they alter the political bias, negative affect, and journalistic writing quality of news. Drawing on 13,777 articles from 15 U.S. news outlets, we evaluate their 41,331 summaries generated by three leading AI-powered browsers: Google Chrome (Gemini), Microsoft Edge (Copilot), and Perplexity Comet. We find that browser-based AI summarizers are broadly accurate. Furthermore, they consistently transform news by attenuating ideological bias, partisan stances, negativity, anger, and fear, while increasing clarity and reducing personal tone. With some variations, these patterns hold across browsers, outlet ideologies, and topics. Our findings identify AI-powered browsers as a new class of editorial intermediaries that systematically reshape news, with implications for democratic discourse and AI governance.