Anthropic said on Friday that the US government has allowed it to release its powerful Claude Mythos 5 artifical intelligence (AI) model to some “trusted” US organisations, partially reversing an order two weeks ago to suspend access over national security risks. More than 100 companies and institutions will now have access to Mythos 5, including many Fortune 500 companies, a source familiar with the new directive said, declining to be identified due to the sensitivity of the matter. Concern that powerful AI systems could be misused by military intelligence users in China, Russia or other countries of concern has prompted US President Donald Trump’s administration to take an aggressive approach to oversight of releases of Anthropic’s and rival OpenAI’s frontier models.