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AII-1001-95391
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GPT-4 More Persuasive Than Humans When Given Personal Data, Study Finds

Researchers found that GPT-4 was 64.4% more persuasive than human debaters when given access to opponents' demographic information including age, job, and political leanings. Without personal data, the AI performed no better than humans, but the study raises concerns about potential misuse of AI for manipulation at scale.

19 May 2025 Β· OpenAI Β· Fraud, scams and manipulation
19 May 2025
AII-1001-953918 sources ↓
Quick facts
Category
Fraud, scams and manipulation
Country
Switzerland
Source
Nature
Date
19 May 2025
Drafted by
Raidu Incident Detection

What happened

Researchers at EPFL in Switzerland, Princeton University, and the Fondazione Bruno Kessler in Italy conducted a study pairing 900 study participants with either a human debate partner or OpenAI's GPT-4. In some cases, the debate participants had access to their counterparts' basic demographic information including gender, age, education, employment, ethnicity, and political affiliation.

The study, published in Nature Human Behaviour, found that GPT-4 was 64.4% more persuasive than human opponents when given personal information about them. Without the personal data, the AI's performance was indistinguishable from human debaters.

When GPT-4 was allowed to personalize its arguments using demographic data, it boosted the odds of changing someone's mind by 81.2% compared to human-human debates. Human debaters did not become more persuasive when given access to the same personal information.

Reported impact

Researchers noted that LLMs have previously been criticized for generating and diffusing hate speech, misinformation, and propaganda, and that at scale, LLMs with users' personal information could be harnessed for malicious purposes.

Experts have widely expressed concerns about the risk of LLMs being used to manipulate online conversations and pollute the information ecosystem by spreading misinformation, exacerbating political polarization, reinforcing echo chambers and persuading individuals to adopt new beliefs.

Index analysis

The study demonstrates that the technology's persuasiveness depends on access to personal demographic data, raising questions about how such information could be exploited in real-world applications.

Researchers warned that LLMs with access to users' personal information could be harnessed to create networks of automated accounts able to strategically nudge public opinion in targeted directions.

Classification

Category
Fraud, scams and manipulation
Industry
Media, social platforms and marketing
Country
Switzerland
Harm status
Potential harm
Intent
Unknown
Timing
Unknown
Harm types
Public interest, Psychological
Harmed
General public
Failure modes
Manipulation or dark pattern
AI systems
GPT-4

Sources and evidence

This record was researched and written by the Index, based on the following original reporting.

Nature
AI is more persuasive than people in online debates
19 May 2025
MIT Technology Review
AI can do a better job of persuading people than we do
19 May 2025
The Guardian
AI can be more persuasive than humans in debates, scientists find
19 May 2025
Washington Post
AI is more persuasive than a human in a debate, study finds
19 May 2025
nature.com
GPT-4 More Persuasive Than Humans When Given Personal Data, Study Finds
Gizmodo
AI Gets a Lot Better at Debating When It Knows Who You Are, Study Finds
19 May 2025
TheRegister.com
LLMs can beat humans in debates - if they get personal info
19 May 2025
nzherald.co.nz
GPT-4 More Persuasive Than Humans When Given Personal Data, Study Finds