Claude Opus 5.5: The System Card
Zvi (Don't Worry About the Vase) TheZvi ● Covered by 3 sources
Claude Opus 5.5’s system card lays out updated classifier and evaluation results, including claims about its cyber strength and evidence on alignment-risk and R&D capabilities. METR’s preliminary AI R&D estimate is about 1.5X overall acceleration from AI, with roughly a 30% chance of 2X. Anthropic says it will adjust how it tests biology by dropping “helpful-only” versions and otherwise relies on largely the same oversight/safeguards while deploying Opus 5.5 to the public with cyber controls.
Why it matters
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, while … Continue reading →
