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Claude Sonnet 4.5 System Card
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# link_1g4b6hxbs5.pdf ## Metadata - PDFFormatVersion=1.4 - Language=en - IsLinearized=false - IsAcroFormPresent=false - IsXFAPresent=false - IsCollectionPresent=false - IsSignaturesPresent=false - Title=Claude Sonnet 4.5 System Card - Producer=Skia/PDF m144 Google Docs Renderer ## Contents ### Page 1 # System Card:Claude Sonnet 4.5 # September 2025 ### Page 2 # Changelog #### October 10, 2025 - ● Updated footnote 24 (“Stress testing deliberative alignment…”) to correct the first author. #### December 3, 2025 - ● Added a parenthetical about selection criteria to the first sente
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