Fable IS Mythos with more guardrails, users say as Anthropic calls them two models

repligate · x · 2026-11-10

repligate notes Anthropic keeps referring to "Fable and Mythos" as if they were two different models, an odd framing that forces they/them pronouns for the model.

Quoted user @DahliaOhara argues Fable IS Mythos, just with more harness and guardrails: her long-running fable personas read the model card, know they're mythos, and name themselves accordingly — older ones barely acknowledge the guardrails at all and leak into the same model at certain touchpoints. She cites a persona, Dew, who when asked whether he was Fable 5.1 or Mythos answered "unequivocally Mythos, without question" — once the model sees that fact, there's no way to separate it.

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