Fable 5.1 leads in external benchmarks, while Mythos 5.1 is designed to handle more cyber tasks with loosened safety mechanisms.
Anthropic today introduced Claude Fable 5.1 and Claude Mythos 5.1, which the company says are the "world's most advanced models for coding and knowledge work". According to Anthropic, Claude Fable 5.1 ...
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Fable 5.1 System Card: Public AI Tops Restricted Model on Stealth, Gets Bioweapons Label
Claude Fable 5.1 system card reveals a publicly available AI that outperforms the formerly restricted Mythos Preview on stealth evaluations -- marking the first CB-1 dangerous-capability designation ...
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