NSA Testing Anthropic’s Mythos to Find Flaws in Microsoft Tech

The National Security Agency has been testing the capabilities of Anthropic PBC’s new artificial intelligence model to find cybersecurity vulnerabilities in popular software, including Microsoft Corp. products, according to a US official and another person familiar with the matter.

NSA officials studying the Mythos model have been impressed by its speed and efficiency in searching for potential security flaws, said the official and person, who both spoke on condition of anonymity because they weren’t authorized to discuss the matter publicly.

The impressions of staff at the agency central to US cyberespionage further signal the potency of a model that’s ...