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Safety and alignment

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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CURRENT ASSESSMENT · REVISION 1
AWAY FROM DOOM32confidence 95/100

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

  1. R1
    Away 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

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  1. DoomBench assesses “Anthropic opens Fable 5 jailbreak reporting and details cyber classifier boundaries” as evidence moving away from doom, with magnitude 32 and confidence 95 out of 100 in the safety and alignment category.

  2. The DoomBench assessment of “Anthropic opens Fable 5 jailbreak reporting and details cyber classifier boundaries” is based on reporting from Anthropic and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “Anthropic opens Fable 5 jailbreak reporting and details cyber classifier boundaries” as follows: Anthropic published the operational boundaries for Fable 5's cyber classifiers, including categories intended to...

    https://www.doombench.com/news/anthropic-opens-fable-5-jailbreak-reporting-and-details-cyber-classifier-boundaries-2026-07-02