Per the author's write-up, an agent harness built with Strands took Claude Opus 5 to 99.95% on ARC-AGI-3, against 30% for the model on its own, and that Strands figure isn't corroborated in indexed sources. The 30% baseline holds up, and NVIDIA reports 100% for Claude Opus 5 wrapped in its own AVO harness.
anthropic
A harness pushes Claude Opus 5 past 30% on ARC-AGI-3
Claude News
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