This is interesting from an AI research perspective but next to irrelevant in practice. When a brute force crack against AES128 or AES256 takes somewhere between 10^20 to 10^50 years (do the math!), then a factor of 200 to 1000 makes no difference.
Discovering cryptographic weaknesses with ClaudeAnthropic researchers find weaknesses in cryptographic algorithms with Claude Mythos Previewwww.anthropic.com