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Claude

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Anthropic Claude OpenAI Claude Opus 5.5 Claude Sonnet 5 Claude Opus 5

Friday, 4 September 2026

Claude Fable 5.1 and Mythos 5.1: The System Card

Zvi (Don't Worry About the Vase) 1 month ago 48 ● 6 sources

Claude Fable 5.1 and Mythos 5.1 system cards describe how Anthropic’s updated models change safety, cyber, alignment, and welfare results compared with prior releases. The bio benchmark LatchBio Bioinformatics improved from 72.5% to 77.6%, while alignment risk is reported as “low” rather than “very low” in the accompanying risk update. Overall, the update is presented as incremental with stronger cyber/classifier defenses and some modest capability gains, while retaining similar conclusions about CB-2 and autonomy risk.

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AI Safety Anthropic Claude Model Evaluation

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