Grok, Elon Musk’s ChatGPT competitor, temporarily refused to respond with “sources that mention Elon Musk/Donald Trump spread misinformation,” according to xAI’s head of engineering, Igor Babuschkin. After Grok users noticed that the chatbot had been given instructions to not respond with those results, Babuschkin blamed an unnamed, ex-OpenAI employee at xAI for updating Grok’s system prompt without approval.

In response to questions on X, Babuschkin said that Grok’s system prompt (the internal rules that govern how an AI responds to queries) is publicly visible “because we believe users should be able to see what it is we’re asking Grok.” He said “an employee pushed the change” to the system prompt “because they thought it would help, but this is obviously not in line with our values.”