Claude Opus 5.5 tops Artificial Analysis Intelligence Index with a score of 58, plus a 20% price cut

Claude Opus 5.5 登顶 Artificial Analysis 智能指数，得分 58

Claude Opus 5.5 scored 58 on the Artificial Analysis Intelligence Index, the highest measured so far. It leads on 6 of 10 evaluations, including Humanity's Last Exam at 61.4% and SciCode at 66.9%, and matches GPT-6 Astra (xhigh) on Terminal-Bench 4.0 at 59.6%. On the agentic knowledge-work eval AA-Briefcase, it hit 1822 Elo—143 points above Fable 5.1—and surpassed GPT-5.6 Sol on both analytical quality and presentation. Pricing dropped to $4/$20 per 1M input/output tokens (from $5/$25), with cache reads down 60% to $0.20. Output tokens per task grew ~60% vs Opus 5, so cost per task stayed flat. Context window remains 1M tokens with image and text input.

Why it matters: Anthropic's flagship tops a major third-party benchmark with a price cut — a same-day must-write. Not a 95 because it's a benchmark result, not a model launch, but 6/10 leads, parity with GPT-6 Astra, and a 20% price drop make it a clear featured pick.