Silent AI vendor changes,
week ending 2026-06-14.

I. Statement of Facts

1. ¶ 1.1 new receipt this week. 1 item this week, none rated critical. Top story: Claude (Anthropic) - Claude Fable 5 hard-refuses cybersecurity, bio/chem, and 'distillation' prompts - silently routing them to the older Opus 4.8.

II. Exhibits entered into the record(1 item)

1. Exhibit A·Re: Claude (Anthropic)MISDEMEANOR

   Nerf Score18/100
   ¶ 1.

   Claude Fable 5 hard-refuses cybersecurity, bio/chem, and 'distillation' prompts - silently routing them to the older Opus 4.8

   Anthropic launched Claude Fable 5 on June 9, 2026 - a new 'Mythos-class' flagship 'made safe for general use' at $10/M input and $50/M output. The catch for security and science users: when Fable 5 detects a request in three domains - offensive/exploitation cybersecurity, most biology and chemistry, and prompts that try to 'distill' Claude's capabilities - it does not answer; the request is automatically handled by the older Claude Opus 4.8 instead. Anthropic says >95% of sessions hit no fallback and users are told when it happens. The unrestricted version, Claude Mythos 5, is gated to authorized cybersecurity partners and selected biology researchers only.

   Citations[1] Anthropic - Claude Fable 5 and Mythos 5 announcement (Jun 9 2026) ↗
   DispositionSee full record →

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