Claude Fable 5.2 and Mythos 5.2

Re:Claude Fable 5.2 and Mythos 5.2 by jeremyjh on Monday November 09, 2026 @03:28PM (#50431545)

Also, the frontier labs are probably always internally using a model more advanced than what has been publicly released.

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Re:Claude Fable 5.2 and Mythos 5.2 by vlyan on Monday November 09, 2026 @04:04PM (#50432108)

because they hate money? google is the only frontier lab that isn't hundreds of billions in the red.

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Re:Claude Fable 5.2 and Mythos 5.2 by jeremyjh on Monday November 09, 2026 @04:08PM (#50432164)

Because they do months of testing. Also, if they have models that are really good at AI research, I’d not expect full versions to ever be released, precisely because of their love of money.

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Re:Claude Fable 5.2 and Mythos 5.2 by thomasmurph on Monday November 09, 2026 @04:08PM (#50432168)

Inference on the research models they have is likely more expensive than the released ones.

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Re:Claude Fable 5.2 and Mythos 5.2 by user43928 on Monday November 09, 2026 @04:18PM (#50432312)

From the model card:

  Model                AECI   95% CI (global)
  Claude Opus 5.5    174.78   170.33-180.29
  Claude Mythos 5.2  177.12   172.42-182.94
  Internal model     178.78   173.75-185.18

Considering the IPO is planned in a week, I doubt they are holding much back.

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