System Card: Claude Opus 4 & Claude Sonnet 4. Direct link to a PDF on Anthropic's CDN because they don't appear to have a landing page anywhere for this document. Anthropic's system cards are always worth a look, and this one for the new Opus 4 and Sonnet 4 has some particularly spicy notes. It's also 120 pages long - nearly three times the length of the system card for Claude 3.7 Sonnet! If you're looking for some enjoyable hard science fiction and miss Person of Interest this document absolute...