Anthropic opens Fable 5 jailbreak reporting and details cyber classifier boundaries
Anthropic published the operational boundaries for Fable 5's cyber classifiers, including categories intended to block destructive, exploit-development and high-uplift vulnerability work while allowing defensive activity. It also opened a HackerOne channel for researchers to submit Fable 5 cyber jailbreaks; the accompanying severity framework remained a draft and is not scored as implemented governance.
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Why it moved the index
Magnitude 32 reflects a concrete disclosure and reporting channel that strengthens monitoring and response around misuse of a frontier cyber-capable model, while recognizing that the proposed severity standard was not yet adopted. Confidence 95 reflects a detailed dated primary source describing deployed classifier behavior and the live HackerOne program.
Assessment history
- R1Away 32 · confidence 95
New operational safeguard event, distinct from the June 30 redeployment: Anthropic documented classifier boundaries and opened a dedicated Fable 5 jailbreak-reporting channel.
12 Aug 2026