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A comment on Claude Fable 5.2 and Mythos 5.2.

Re:Claude Fable 5.2 and Mythos 5.2 by aurareturn on Monday November 09, 2026 @02:10PM (#50430155)
Is this the Model 4 internal name?

Reference: https://x.com/METR_Evals/status/2118412205662314935

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Re:Claude Fable 5.2 and Mythos 5.2 by bluebands on Monday November 09, 2026 @02:27PM (#50430473)
Probably not, not enough time to red-team
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Re:Claude Fable 5.2 and Mythos 5.2 by dwohnitmok on Monday November 09, 2026 @03:54PM (#50431978)
No this is only Model 3. See page 39 of the system card and onwards: https://assets.claude.com/27d60918d218125e7504bc7354c4b4626e...

Pretty crazy that Anthropic already has another model waiting in the wings that is significantly better than this.

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