U.S. AI company Anthropic reported that it has blocked multiple attempts to use its AI models, including the chatbot Claude, for research that could aid in the development of biological weapons. The report cited cases of misuse over the past eight months, including one where scientists sought help to modify the Chikungunya virus to make it more harmful, with the work potentially intended for military research institutions. Jacob Klein, Head of Threat Intelligence at Anthropic, stated that the company takes a cautious approach to research intentions. Andrew Weber of the Strategic Risk Council called for restricting access to AI models. Donald Trump dismissed concerns that AI could lead to human extinction, emphasizing the importance of the U.S. leading the AI race.