Verified source report
Anthropic apologizes for invisible Claude Fable guardrails
Anthropic has apologized for stealthily throttling its new AI model, Claude Fable 5, with hidden guardrails that undermine both researchers and rivals using it to develop competing systems. The company says it is reversing course and will be more transparent about when the restrictions kick in, even if that means Fable refuses more queries. Fable […] Anthropic has apologized for stealthily throttling its new AI model, Claude Fable 5 , with hidden guardrails that undermine both researchers and rivals using it to develop competing systems. The company says it is reversing course and will be more transparent about when the restrictions kick in, even if that means Fable refuses more queries. Fable is the first widely available model in Anthropic's Mythos class of AI systems, a group the company has spent months warning are too dangerous for public release . Anthropic says it has addres
What happened
According to The Verge’s source item, Anthropic apologizes for invisible Claude Fable guardrails, Anthropic has apologized for stealthily throttling its new AI model, Claude Fable 5, with hidden guardrails that undermine both researchers and rivals using it to develop competing systems. The company says it is reversing course and will be more transparent about when the restrictions kick in, even if that means Fable refuses more queries. Fable […] Anthropic has apologized for stealthily throttling its new AI model, Claude Fable 5 , with hidden guardrails that undermine both researchers and rivals using it to develop competing systems. The company says it is reversing course and will be more transparent about when the restrictions kick in, even if that means Fable refuses more queries. Fable is the first widely available model in Anthropic’s Mythos class of AI systems, a group the company has spent months warning are too dangerous for public release . Anthropic says it has addres
Context
The development sits in VINI’s Technology file for readers following technology, science, product policy, markets, infrastructure, and the public consequences of innovation. The original report is linked so readers can check the source account, follow later updates, and compare new coverage against the first published record. The source item is dated 2026-06-11T11:40:43+00:00.
What to watch
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Source
Primary source: Anthropic apologizes for invisible Claude Fable guardrails via The Verge. VINI cites and links the source; it does not reproduce the publisher’s full article text without rights clearance.
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Source links
- Anthropic apologizes for invisible Claude Fable guardrailsThe Verge - 2026-06-11T11:40:43+00:00
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