Claude Mythos cut HAWK's key strength in half in 60 hours and improved attacks on reduced AES by 200-800x. No production systems are affected. Each discovery cost ~$100K.

Anthropic researchers find weaknesses in cryptographic algorithms with Claude Mythos Preview

Claude Mythos cut HAWK's key strength in half in 60 hours and improved attacks on reduced AES by 200-800x. No production systems are affected. Each discovery cost ~$100K.