Smartest xAI Models

Match · Updated July 2026

The smartest xAI model is Grok 4.5, scoring 53.8 on the Artificial Analysis Intelligence Index. Grok 4.3 (37.6) and Grok 4.20 (37.0) round out the top three.

53.8Intelligence

$2.00Input /M

500KContext

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

Frequently asked

What is the smartest xAI model?

The smartest xAI model is Grok 4.5, scoring 53.8 on the Artificial Analysis Intelligence Index. Grok 4.3 (37.6) and Grok 4.20 (37.0) round out the top three.

What's a good alternative to Grok 4.5?

Grok 4.3 (37.6) is the closest alternative on this metric, followed by Grok 4.20 (37.0). See the full ranking above for the tradeoffs.

How many xAI models are there?

modelgrep tracks 5 xAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by Grok 4.5. 3 of them qualify for this ranking.

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All rankings

Small & Fast LLMs Best Local 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 Best LLMs for Writing Best LLMs for Math & Science Best LLMs for RAG Best LLMs for SQL & Data Analysis Best LLMs for Roleplay Best Uncensored LLMs