Smartest xAI Models

Quick answer · Updated June 2026

The smartest xAI model is Grok 4.3, scoring 53.2 on the Artificial Analysis Intelligence Index. Grok 4.20 (29.7) is next.

53.2Intelligence

155 t/sSpeed

$1.25Input /M

1MContext

The most capable AI models ranked by the Artificial Analysis Intelligence Index — a composite of reasoning, knowledge, math and science benchmarks. These are the highest-scoring large language models available today.

1X
grok-4.3
ReasoningToolsJSON+1$1.25/M · 155 t/s · 670ms ttft
53.2
Intelligence
2X
grok-4.20
ReasoningToolsJSON+1$1.25/M · 76 t/s · 691ms ttft
29.7
Intelligence

Frequently asked

What is the smartest xAI model?

The smartest xAI model is Grok 4.3, scoring 53.2 on the Artificial Analysis Intelligence Index. Grok 4.20 (29.7) is next.

What's a good alternative to Grok 4.3?

Grok 4.20 (29.7) is the closest alternative on this metric. See the full ranking above for the tradeoffs.

How many xAI models are there?

modelgrep tracks 4 xAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by Grok 4.3. 2 of them qualify for this ranking.

More xAI rankings

xAI: Best LLMs for Coding xAI: Best LLMs for Design & Frontend xAI: Fastest LLMs xAI: Lowest-Latency LLMs xAI: Cheapest LLMs xAI: Best Free LLMs xAI: Best Reasoning LLMs xAI: Best Vision LLMs xAI: Best LLMs for Agents xAI: Best Open-Source LLMs xAI: Longest-Context LLMs

All rankings

Small & Fast LLMs Best LLMs for Coding Best LLMs for Design & Frontend Fastest LLMs Lowest-Latency LLMs Cheapest LLMs Best Free LLMs Best Reasoning LLMs Best Vision LLMs Best LLMs for Agents Best Open-Source LLMs Longest-Context LLMs