Best xAI Reasoning Models

Match · Updated July 2026

The best xAI model for reasoning is Grok 4.5 — 53.8 intelligence with extended step-by-step thinking. Grok 4.3 (37.6) and Grok 4.20 (37.0) round out the top three.

53.8Intelligence

$2.00Input /M

500KContext

Large language models with extended reasoning / thinking, ranked by intelligence. The smartest AI models for complex multi-step reasoning, math and analysis.

Frequently asked

What is the best xAI model for reasoning?

The best xAI model for reasoning is Grok 4.5 — 53.8 intelligence with extended step-by-step thinking. 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. 5 of them qualify for this ranking.

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