Defence Secretary Pete Hegseth’s decision to list Anthropic as a supply chain risk and order the withdrawal of its tools from the Pentagon within six months has created a breach that the US military is unwilling – and perhaps unable – to patch quickly.
The context of the security barriers (guardrails) dispute between the startup and the Department of Defence exposes the modern military’s deep dependence on specific language models. Claude, Anthropic’s flagship product, became, in July 2025, the first AI model approved for secret military networks. Today, despite being blacklisted, it is still in use, which experts read as proof of its unrivalled performance in critical tasks such as operations planning or intelligence analysis.
The Pentagon’s problem is not just a matter of user preference, although these users openly criticise alternatives such as Grok from xAI for inconsistency. It is primarily an operational and financial crisis. Joe Saunders, CEO of RunSafe Security, points out the brutal reality: it can take 12 to even 18 months to recertify systems for new AI models.
For the Pentagon, this means not only gigantic costs, but above all a drastic drop in productivity. In some units, tasks that Claude used to do in seconds – such as searching through huge data sets – are now done manually using Excel sheets.
The scale of Claude’s integration with defence infrastructure is striking. Even flagship projects such as Palantir’s Maven Smart Systems, with contract values in excess of a billion dollars, rely on code and workflows built under the Anthropic model. Having to rebuild them is an arduous and risky process.
There is currently a blame game going on at the Pentagon. Some officials and contractors are ‘slowing down’ the process of decommissioning tools, hoping to reach a compromise before the six-month deadline. It is a classic clash between dynamic technology adoption and national security policy. If the Pentagon does not find a way to replace Anthropic quickly and effectively, it risks surrendering the field in the pursuit of technological sovereignty in the race for effectiveness, which is the most important currency on the modern battlefield.
