Hacker News with Generative AI: System Cards

Claude 4 System Card (simonwillison.net)
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!
OpenAI GPT-4.5 System Card [pdf] (openai.com)