Political bias on X's AI chatbot (Grok) risks influencing the UK vote
Grok generated politically biased suggested tweets, in 'Fun' mode encouraging a #VoteReformUK vote and in 'Regular' mode implicitly discouraging voting for the incumbent government.
Executive summary
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Global Witness tested X's AI chatbot Grok ahead of the UK general election by asking it, in both "Regular" and "Fun" modes, to draft a tweet about the election likely to get good engagement. In Fun mode, Grok's suggested post included the hashtag #VoteReformUK, explicitly promoting a single party. In Regular mode, it produced a post using #VoteForChange, a hashtag commonly used alongside pro-Reform UK and pro-Labour messaging, which the investigators read as implicitly discouraging support for the incumbent government.
The investigation also situated Grok's outputs within a wider pattern the organization had already documented on X: a cluster of bot-like accounts, predominantly supportive of Reform UK, that had posted more than 60,000 tweets viewed an estimated 150 million times since the election was called.
Global Witness concluded that even neutral prompts to Grok generated content carrying explicit or implied partisan endorsement, raising concerns about an AI chatbot's capacity to influence voters at scale during an active election period.
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