Anthropic apologizes for invisible Claude Fable guardrails

Published 11 June 2026 · tech

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

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 addressed some of those risks by launching Fable with safeguards that prevent it from responding to certain "high-r … Read the full story at The Verge.

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