GPT-5.6: The System Card

A real newsletter email from Zvi Mowshowitz. Captured June 28, 2026.

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Captured June 28, 2026Newsletter

A technical analysis and review of the OpenAI GPT-5.6 system card, evaluating its capabilities, safety, and performance benchmarks.

A clean, single-column newsletter layout typical of Substack. It features a text-heavy structure interspersed with data tables and charts. The hierarchy is defined by clear headings, with CTAs for subscription placed at the end.

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