Anthropic 7/2 Fable 5 cyber safeguards + CJS scale + HackerOne bounty: a Glasswing three-party safety-governance release

Anthropic's July 2, 2026 post on Fable 5 cyber safeguards and jailbreak framework details: a draft Cyber Jailbreak Severity (CJS) scale co-developed with 'Glasswing partners' (Amazon, Microsoft, Google) — five bands CJS-0 Informational (score 0), CJS-1 Low (1-3.5), CJS-2 Medium (4-6.5), CJS-3 High (7-8.5), CJS-4 Critical (9-10), scored on four axes (capability gain, breadth of capability gain, ease of weaponization, discoverability); the final level may be raised but not lowered relative to the initial calculation. Companion HackerOne bug-bounty program at hackerone.com/anthropic-cyber-jailbreak accepts Fable 5 cyber jailbreak submissions; feedback address cyber-safeguards@anthropic.com. Classifiers sort cyber activity into four buckets (Prohibited, High-risk dual use, Low-risk dual use, Benign) with a larger safety margin than prior models.