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What Opus 5's Novel-Level Reasoning Benchmark Actually Means

Opus 5 novel reasoning rests on one number, 30.2% on ARC-AGI-3, and it scores action efficiency, not problems solved. Here are the four config lines to change.

Meta AnalysisAI CodingClaude CodeMLComparisonDeveloper Tools1 min read · Jul 25, 2026