# Claude Opus 5.5 tops Artificial Analysis' revised AI index with 58 points > Source: > Published: 2026-10-28 13:23:10+00:00 # Claude Opus 5.5 tops Artificial Analysis' revised AI index with 58 points **The October 27th update adds coding and scientific-work benchmarks, puts 60% of the score on private or held-out answers, and introduces a separate capability trend index.** By [Ryan Merket](https://runtimewire.com/author/ryan-merket) · Published Primary source: [x.com](https://x.com/ArtificialAnlys/status/2115265133467635877) ## Why it matters Artificial Analysis is making contamination resistance a defining feature of its leaderboard while changing the tests and weights that determine scores. Buyers get a broader comparison that includes task costs, but should treat v5 as a revised measurement system, not a directly comparable continuation of earlier rankings. Artificial Analysis says 60% of its Intelligence Index v5 now rests on private test sets or held-out answers, as the model evaluator tries to make its leaderboard harder to game. The October 27th release also adds benchmarks for coding and terminal-based scientific work, changes the index's category weights, and introduces a second measure for tracking model capability over time. The company laid out the update in its [announcement article](https://artificialanalysis.ai/articles/artificial-analysis-intelligence-index-v5) and [X thread](https://x.com/ArtificialAnlys/status/2115265133467635877).… When you purchase through links in our articles, [we may earn a small commission](https://runtimewire.com/affiliate-monetization-standards). This doesn’t affect our editorial independence.