2026-06-11
TechCrunch
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Cybersecurity researchers complain that Claude Fable 5's guardrails are too restrictive, rejecting “innocuous tasks” like reading blog posts or reviewing code
Researchers say that the new LLM basically blocks anything related to cybersecurity, including code reviews and prompts asking for help writing secure code.
2026-06-10
The Verge
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Sources: Microsoft is restricting employees from using Claude Fable 5 because of Anthropic's new 30-day data retention requirements
then it launched a public version called Fable 5 that it warns ‘comes with risks’Sinisa Markovic /Help Net Security:Anthropic's Claude Fable 5 is out for public use, with safeguards for high-risk requ...
TechCrunch
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Cybersecurity researchers complain that Claude Fable's guardrails are too strict, rejecting “innocuous tasks” like reading blog posts or performing code reviews
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.
2026-06-09
Wired
98 related
Anthropic debuts Claude Fable 5, a “safe” Mythos-class model it says can't be used for cyberattacks, to the public, and Claude Mythos 5 to trusted organizations
Anthropic is releasing Claude Mythos 5 to trusted organizations and Claude Fable 5 to the public, a version it says can't be used for cyberattacks.
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