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Claude Fable 5 and Mythos 5 [Linkpost]

LessWrong · Jun 9, 2026, 5:19 PM · Also reported by 4 other sources

LESSWRONGLWLogin Claude Fable 5 and Mythos 5 [Linkpost] — Less Wrong Frontpage8Claude Fable 5 and Mythos 5 [Linkpost]by fluxxrider9th Jun 20261 min read18This is a linkpost for https://www.anthropic.com/news/claude-fable-5-mythos-5

1Comments1Frontpage8New Comment Submit 1 comment, sorted by top scoring Click to highlight new comments since: Today at 5:45 PM[-]zw520m40

I wonder how this restriction will play out for ML researchers. I use Claude a lot for data science, I am not sure how specific these safeguards are, but I think they could plausibly trigger on a lot of data science/model training research.

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Hacker News Claude Mythos 5 / Fable 5 Hacker News System Card: Claude Fable 5 and Claude Mythos 5 [pdf] The Verge Anthropic releases its first Mythos-class model Claude Fable TechCrunch AI Anthropic’s Claude Fable is a version of Mythos the public can access today

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