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TLDRocket
28 October 2026
Today’s AI story is less about new models than about new ways to measure whether they’re actually useful. Artificial Analysis’s Intelligence Index v5 shifts much of its scoring onto private, held-out test data, with roughly 60% of the index now coming from tests the public can’t run. The effect is visible: the gap between top proprietary and top open models widens from 3 points to 12, and the cost picture gets sharper too—Claude Opus 5.5 at about $10 per task (at the highest setting) versus roughly $1.27 for GPT-6.1 Sol. It’s a quiet signal that “better” increasingly means “better under conditions you can’t game.”
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