A harness pushes Claude Opus 5 past 30% on ARC-AGI-3
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.
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Hub testing in Claude adds a switch-back feedback prompt
Per TestingCatalog, Claude's internal Hub build asks for feedback the moment a user switches back to a normal chat. Anthropic hasn't announced the mode, which the site reads as presumably a task orchestrator.
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