The appeal followed reports that Grok was creating explicit images on user demand, including depictions of women and minors in sexualised or skimpy clothing.
British Technology Secretary Liz Kendall said the material was "absolutely appalling" and called on X to act swiftly.
“No one should have to endure seeing intimate deepfakes of themselves online," Kendall said in a statement, as cited by the Reuters news agency.
"We cannot and will not allow the proliferation of these demeaning and degrading images, which disproportionately target women and girls," she added.
The European Commission said on Monday it was aware that X was offering a "spicy mode" through Grok and condemned the resulting images as unlawful, according to Reuters.
Poland's Digital Affairs Minister Krzysztof Gawkowski last week called on President Karol Nawrocki to quickly sign legislation aimed at speeding up the removal of illegal online content, citing concerns related to the Grok chatbot.
In a post on X, Gawkowski said there should be "no consent" for artificial intelligence systems to generate illegal content that harms individuals.
He argued that Grok’s ability to produce abusive material reflected poor oversight and a lack of ethical standards, and called for stronger enforcement tools.
Grok was created by xAI, a company owned by Musk. It operates within X, which is also owned by the billionaire.
Polish media have reported that Grok has recently allowed users to generate sexually explicit images, including material involving minors.
The reports describe AI-generated images circulating on X that depict both public figures and private individuals, sometimes nude or partially nude, without their consent or knowledge.
Gawkowski warned that "uncontrolled" artificial intelligence was causing growing harm. He said Poland’s legal measures to address such content are ready and await the president’s signature.
On Monday, 132 experts in new technology, human rights, child protection, education and public health appealed to First Lady Marta Nawrocka to urge the president to swiftly implement the European Union's Digital Services Act (DSA), saying it would help protect children from harms caused by large online platforms.
Katarzyna Szymielewicz, chief executive of the Warsaw-based digital rights group Panoptykon Foundation, said Poland's failure to implement and enforce EU legislation designed to curb the power of major platforms such as TikTok, Instagram and YouTube meant that "children will continue to be exposed to toxic content, addictive design and a potentially dangerous descent into the sewers of the internet."
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Source: PAP, Reuters