Anthropic Fable won't answer prompts about cybersecurity or cryptography (falling back to Opus instead) but they will send engineers to the NSA to help them with offensive operations.
"Anthropic is helping the US National Security Agency deploy its powerful Mythos AI model for offensive cyber operations [... Anthropic] had installed about half a dozen staff within the NSA as so-called forward-deployed engineers to guide the use of the technology and customise models for specific applications“
https://www.ft.com/content/d02d91b3-2636-454e-9442-dc7e69f51815?syn-25a6b1a6=1