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Opus 5.5 achieves 93% on ARC-AGI at fraction of prior cost
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Opus 5.5 from @AnthropicAI on ARC-AGI (Verified): - ARC-AGI-2: 93.3%, $0.41/task - ARC-AGI-1: 98.5%, $0.16/task Opus 5.5 outscored Opus 5 by 2.9 percentage points on v2 and 1.0 on v1, at roughly 80% lower evaluation cost.
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