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US Cites China-Access Fears Over Mythos; Anthropic Halts Model

  • Foundation Models
  • Policy & Regulation
  • Security

In June 2026, the US Commerce Department issued an export-control directive limiting access to Anthropic's frontier models "Claude Mythos" and "Claude Fable 5" to US citizens, prompting Anthropic to suspend both models entirely. The move is reportedly tied to suspicions that a China-linked group accessed Mythos.

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