Anthropic's 7/3 closer: Fable 5 cyber safeguards + jailbreak framework, completing the 7/1-7/3 three-part release

Anthropic's July 3, 2026 post 'More details on Fable 5's cyber safeguards and our jailbreak framework' describes what is and isn't blocked by Anthropic's cyber classifiers, and releases a first draft of its jailbreak severity framework. Layered onto the 7/1 morning 'redeploying-fable-5' (export controls lifted + redeployment + first mention of the 'industry jailbreak framework') and the 7/1 evening 'claude-fable-5-mythos-5' (Fable 5 positioned as Mythos-class + safe for general use), this completes a clean 7/1-7/3 three-part Fable 5 release: morning for access, evening for positioning, 7/3 for security details.