Claude Opus 5.5 Tops AI Index at 58, Cuts Price 20% to Match GPT-6 Astra
brandon_galang · x · 2026-09-23
Artificial Analysis benchmarks Claude Opus 5.5: it takes the top spot on the Intelligence Index with a score of 58—the highest ever measured by several points—matching GPT-6 Astra on Terminal-Bench 4.0 and AutomationBench-AA while extending Anthropic's lead in agentic knowledge work. Pricing drops 20% to $4/$20 per 1M input/output tokens (from $5/$25), with cache reads cut from $0.50 to $0.20. The poster notes this is Anthropic's first model on the price-performance pareto frontier.
Related event: Anthropic Launches Claude Opus 5.5: Stronger, 40% Cheaper, Tops AA Index(259 posts)→
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