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From:
Simon Willison’s Weblog
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System Card: Claude Opus 4 & Claude Sonnet 4
https://simonwillison.net/2025/May/25/claude-4-system-card/
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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 …
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