Anthropic’s two 5.1 configurations share model weights but not safeguards. Fable 5.1 is the broadly available option with effort and cache controls; Mythos 5.1 is reserved for vetted organizations and trusted research programs.
Improve English fluency with personalized lessons
Custom AI character and companion with chat and voice
Email marketing with AI-assisted content and audience tools
AI-assisted video editor for short-form and social content
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