Users who replied to images of women and requested that Grok “remove her clothes” received an in-thread reply with an image of the woman in lingerie or a bikini. Occasionally, Grok replied with a link to a separate chat containing the image.

The announcement was made at Microsoft’s Build developer conference on Monday, and was notable given Microsoft’s partnership with OpenAI. Musk founded xAI, the startup behind Grok, but he has also been locked in a feud with OpenAI since stepping down from its board in the late 2010s, citing disagreements over its leadership direction.