xAI has 18 models on The Model Index, from Grok-1 (Nov 2023) to Grok 4.7 (21 Sep 2026). Its strongest is Grok 4.7, with an estimated index score of ~178 (GPT-4 = 100). 2 have open weights.
Index score is fitted from independent evaluations and scaled so GPT-4 = 100; a striped bar is an estimate for a model not yet independently tested. Prices are list prices per million tokens.
Dates come from each lab's own announcement, linked where one exists.