System card confirms Claude MyTHOS 5 and Fable 5 share the same underlying weights
repligate · x · 2026-11-10
Anthropic's system card confirms new models Claude MyTHOS 5 and Claude Fable 5 share the "same underlying model weights." MyTHOS 5 is restricted to vetted partners via Project Glasswing to defend critical global software infrastructure, while Fable 5 ships for general access with additional safeguards against cybersecurity and biology misuse — the difference is deployment-layer protections, not the model itself.
Related event: Anthropic System Card Confirms MyTHOS 5 and Fable 5 Share Weights(2 posts)→
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