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Cybersecurity researchers aren’t happy about the guardrails on Anthropic’s Fable

TechCrunch AI · Jun 10, 2026, 3:41 PM · Also reported by 4 other sources

Key takeaways

  • Anthropic released its latest model Fable on Tuesday, billing it as a public and limited version of its powerful and much-hyped cybersecurity model Mythos.
  • But not everyone is happy with the restrictions, and a number of cybersecurity researchers and professionals have aired complaints online.
  • “[Fable] rejects any request that could be tangentially cyber related.

Why this matters: a development in AI with implications for how people work, create, and decide.

Anthropic released its latest model Fable on Tuesday, billing it as a public and limited version of its powerful and much-hyped cybersecurity model Mythos.

But not everyone is happy with the restrictions, and a number of cybersecurity researchers and professionals have aired complaints online.

“[Fable] rejects any request that could be tangentially cyber related. Even innocuous tasks like reading a blog post,” said Valentina “Chompie” Palmiotti, a well-known security researcher who works at IBM X-Force.

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