Claude Opus 5: The System Card

A real newsletter email from Zvi Mowshowitz. Captured July 25, 2026.

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About this email

Captured July 25, 2026Newsletter

An in-depth analysis and system card review of Claude Opus 5, covering capabilities, safety, cyber performance, and alignment.

A clean Substack newsletter layout featuring author bio at the top, extensive analytical text interspersed with data charts and graphs, and a prominent paywall upgrade button near the bottom.

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