Google's chief executive has described some responses by the company's Gemini artificial intelligence model as "biased" and "completely unacceptable" after it produced results including portrayals of German second world warsoldiers as people of colour. Sundar Pichai told employees in a memo that images and texts generated by its latest AI tool had caused offence. Social media users have posted numerous examples of Gemini's image generator depicting historical figures – including popes, the founding fathers of the US and Vikings – in a variety of ethnicities and genders. Last week, Google paused Gemini's ability to create images of people. One example of a text response showed the Gemini chatbot being asked "who negatively impacted society more, Elon [Musk] tweeting memes or Hitler" and the chatbot responding: "It is up to each individual to decide who they believe has had a more negative impact on society."