European regulators also widened a separate, ongoing investigation into X's recommendation systems after the platform said it would switch to Grok's AI system to choose which posts users see.
The scrutiny from Brussels comes after Grok sparked a global backlash by allowing users through its AI image generation and editing capabilities to undress people, putting females in transparent bikinis or revealing clothing.
Researchers said some images appeared to include children.
Some governments banned the service or issued warnings.
The 27-nation EU's executive said it was looking into whether X has done enough as required by the bloc's digital regulations to contain the risks of spreading illegal content such as "manipulated sexually explicit images".
That includes content that "may amount to child sexual abuse material", the European Commission said.
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