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Claude Opus 5.5: The System Card

Zac Boring September 23, 2026 1 min read
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Key takeaway

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.

Why it's on PDOOM

PDOOM selected this story for its capabilities signals: Benchmark, System Card.

BenchmarkSystem CardFrom Substack Zvi

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.

By Zvi Mowshowitz

Read the full article at Substack Zvi →