Anthropic Just Made Jailbreak Testing a Release Requirement
Anthropic brought Claude Fable 5 back online in July 2026 with a four-category cybersecurity classifier and a proposed CJS-0 to CJS-4 scale for rating how dangerous an AI jailbreak really is. The jailbreak that triggered it worked on rival models too, which is the point: these weaknesses are a property of capable models, so the durable news is the scoring standard, not the one patch. Think of it as CVSS arriving for AI jailbreaks, a shared severity language that turns safety from anecdote into something buyers can demand. For PMs, it signals that severity-scored safety evaluation is about to move from research virtue to procurement requirement, and your release process should get ahead of it.