Also: Anthropic's proposal for the AI industry to collectively slow down.

Welcome to the AI Safety Newsletter by the Center for AI Safety. We discuss developments in AI and AI safety. No technical background required.

In this edition, we look at Anthropic's release of its latest model, Fable 5, and the US government's subsequent order to restrict it. We also discuss Anthropic's recent call for the “option to slow or temporarily pause frontier AI development.”

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The US Government Restricts Fable Days After its Release

On June 9, Anthropic released Claude Fable 5 to the public. The model is significantly more capable than previous releases; it is the highest-scoring model on the benchmark Humanity's Last Exam, achieving 53.3% compared with Claude Opus 4.8's score of 45.7%. Anthropic described Fable as having similar capabilities to Claude Mythos Preview—a model announced in April that the company deemed too good at finding cyber vulnerabilities to be safe for general release. Anthropic also made Mythos 5, a version of Fable without strict bio or cyber safeguards, available to a small number of trusted organizations.

Fable 5, Anthropic's “Mythos-class” model with [...]

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Outline:

(00:40) The US Government Restricts Fable Days After its Release

(04:16) Anthropic Calls for Option to Slow AI Development

(06:50) In Other News

(06:54) Government

(07:43) Industry

(08:19) Civil Society

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First published:
June 17th, 2026

Source:
https://newsletter.safe.ai/p/aisn-75-anthropic-releases-fable

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Want more? Check out our ML Safety Newsletter for technical safety research.

Narrated by TYPE III AUDIO.

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Images from the article:

Fable 5, Anthropic’s “Mythos-class” model with safeguards, was available for a few days before the US government ordered access restrictions due to national security concerns. Source __T3A_LINK_IN_POST__.Anthropic’s post described how future AI agents might be able to “close the loop” and build their successors without human involvement. Source __T3A_LINK_IN_POST__.

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