Anthropic vowed to challenge the Pentagon in court over its blacklisting of the company for refusing to lift all safeguards on the military's use of its model, Claude — adding it's "deeply saddened" by the escalating dispute.Why it matters: The frontier AI company is doing what few other companies have done since Trump's second term began — directly and publicly challenging the administration.President Trump and Defense Secretary Pete Hegseth threatened earlier Friday to cut off Anthropic from...