Intelligence Index

Artificial Analysis has launched Intelligence Index v5, featuring 2 new benchmarks and 3 upgrades, including new coding and science benchmarks. For the first time, the majority of the Index is built on private datasets. Claude Opus 5.5 (max) leads at 58.

Artificial Analysis released version 4.2 of its Intelligence Index after its original scoring showed GPT-6 Astra barely improving on its predecessor, contradicting Epoch AI's ranking of Astra as the top model out of 267 tested. The update adds two benchmarks, drops the saturated GPQA-Diamond, and increases private test weighting to 40 percent.

xAI's Grok 4.20 scores 48 on Artificial Analysis' Intelligence Index—6 points ahead of Grok 4 but trailing Gemini 3.1 Pro Preview and GPT-5.4 at 57. The model distinguishes itself with a 78% non-hallucination rate on the AA Omniscience test, the highest recorded across any model tested.