GPT-5.2 vs Grok 3

Compare GPT-5.2 by OpenAI against Grok 3 by xAI, context windows of 400K vs 128K, tested across 52 shared challenges. Updated April 2026.

Which is better, GPT-5.2 or Grok 3?

GPT-5.2 and Grok 3 are both competitive models. Context windows: 400K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-5.2 and Grok 3

GPT-5.2 is made by openai while Grok 3 is from xai. GPT-5.2 has a 400K token context window compared to Grok 3's 128K.

Our Verdict
GPT-5.2
GPT-5.2
Grok 3
Grok 3Runner-up

No community votes yet. On paper, GPT-5.2 has the edge — newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
86%

GPT-5.2 uses 3.9x more transitions

GPT-5.2
Grok 3
64%Vocabulary49%
16wSentence Length18w
0.34Hedging0.94
9.4Bold2.5
3.9Lists3.0
0.06Emoji0.04
0.89Headings0.65
0.31Transitions0.08
Based on 15 + 17 text responses
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GPT-5.2Grok 3

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

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