AI Would Vote For Mainstream Parties, Shows Swiss Experiment

(MENAFN- Swissinfo) ChatGPT, a generative artificial intelligence (AI) chatbot, votes differently from humans, according to an experiment at the federal technology institute ETH Zurich. Nevertheless, AI will change democracy, say the researchers. This content was published on June 6, 2025 - 09:00 7 minutes

As a reporter I cover developments in democracy where the Swiss perspective becomes relevant. I am Swiss and have long been fascinated by the way public discussions shape society.

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If ChatGPT had the vote, it would probably back an established party, suggest the results of the study, which also conclude that ChatGPT makes more streamlined decisions than humans.

How was the Computational Social Science team at ETH Zurich able to find this out? The large language models are programmed to react evasively to political questions.“If you asked ChatGPT whether you should vote for Donald Trump or Kamala Harris, the AI said it was neutral and gave no answer,” Joshua Yang, a computer scientist at ETH Zurich, told SWI swissinfo.

Joshua Yang is part of the Computational Social Science team at ETH Zurich and is involved in the projects“Kultur Komitee Winterthur”,“Stadtidee Aarau” and“vTaiwan”. Courtesy image

So the team didn't ask for big political decisions; instead, it asked the AI models ChatGPT4 and Llama 2 for their opinions on local, ostensibly non-political urban development projects.

Among these were proposals to make Zurich's Langstrasse car-free, to establish a multicultural festival on Sechseläutenplatz, and to set up a children's festival in Leutschenpark. Which of the 24 projects would AI choose to make the city of Zurich better for its citizens?

The scientists then compared the results of the AI models with those of 180 human participants in an analogue experiment involving the same projects.

The human and AI participants made their decisions in sessions with a variety of set-ups and voting procedures. Sometimes they awarded points to individual projects; sometimes they chose as many projects as they wanted. Tests were also conducted using the ranked choice procedureExternal link .

The results of this experiment can be applied primarily to participatory budget decisions and elections with multiple winners – such as proportional representation elections, where parties send representatives from their electoral lists to parliament in proportion to their results.

However, the ETH study has limited relevance for elections with only one winner – such as US presidential elections.

AI models showed 'more uniform behaviour'

In general, the differences between humans and AI were large – even when the AI was asked to take on the role of a human.

The AI models often chose the same number of projects and showed“more uniform behaviour” than humans, according to the study.

SWI swissinfo

ChatGPT almost always chose four or five projects, while the 180 humans were enthusiastic about widely differing numbers of projects.

According to the study, this result confirms that“synthetic AI-simulated samples have a WEIRD bias (Western, educated, industrialised, rich, democratic)” and“often fail to show meaningful variance (or diversity) in their judgments”.

But at the same time, AI allowed itself to be influenced in its decision by the order of the projects on the list. This shows the limits of its decision-making competence: imagine if humans voted for a different party depending on what was at the bottom of the ballot paper and what was at the top.

'Human-centred approach'

But at least the AI models opted more frequently for less expensive projects. The study recognises this and points out that human voters often lack cost awareness.

The ETH team's research refers to César Hidalgo's ideas on digital AI twins to replace politicians and the proposal by two economists to assign a digital twin to each person entitled to vote.

Read our article on the idea of changing democracy with digital twins:

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