AES

Anthropic researchers used a Claude model called Mythos Preview to discover new cryptanalytic attacks against the HAWK signature scheme and a weakened version of AES. The work took 60 hours and roughly $100,000 in API costs, with human researchers repeatedly intervening to stop the model from giving up.

Anthropic's Claude Mythos Preview model independently discovered a new cryptanalytic attack on a reduced version of AES-128 and improved an existing attack on the post-quantum signature scheme HAWK. Each research run cost roughly $100,000 in API fees, with human researchers largely limited to project management and verification.