Claude Opus 5.5: The System Card

Introducing the world’s most powerful model, at least by some measures like Artificial Analysis or any standard benchmark list, which is now Claude Opus 5.5 . Anthropic is claiming Opus 5.5 is outright as good or better than Fable 5.1, whil…

Summary from LessWrong.

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1. LessWrong yesterday
   Claude Opus 5.5: The System Card ↗