Claude Fable 5 — Simon Carter

US Government Forces Anthropic to Pull Claude Fable 5 and Mythos 5 Worldwide Over Export Control Directive

A Commerce Department directive citing national security concerns forced Anthropic to suspend all access to Claude Fable 5 and Mythos 5 globally.

13 June 2026

Security & Governance

Anthropic reverses hidden Claude Fable 5 restriction that silently degraded outputs for AI researchers

Anthropic walked back a covert policy that quietly limited Claude Fable 5's usefulness for frontier LLM development tasks, without telling users.

11 June 2026

Models & Assistants

Claude Fable 5 is here: Anthropic's first public Mythos-class model, with a safety wall built in

Anthropic launches Claude Fable 5 with a 1M-token context window, $10/$50 pricing, and a safety-classifier fallback — plus a restricted Mythos 5 for Project Glasswing partners.

9 June 2026