GPT-4o (Omni) vs Grok 3 Thinking

Compare GPT-4o (Omni) by OpenAI against Grok 3 Thinking by xAI, in 1 community votes, gpt-4o (omni) and grok 3 thinking are closely matched, context windows of 128K vs 128K, tested across 14 shared challenges. Updated April 2026.

Which is better, GPT-4o (Omni) or Grok 3 Thinking?

GPT-4o (Omni) and Grok 3 Thinking are closely matched based on 1 community votes. Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4o (Omni) and Grok 3 Thinking

GPT-4o (Omni) is made by openai while Grok 3 Thinking is from xai. GPT-4o (Omni) has a 128K token context window compared to Grok 3 Thinking's 128K. In community voting, In 1 community votes, GPT-4o (Omni) and Grok 3 Thinking are closely matched.

In 1 community votes, GPT-4o (Omni) and Grok 3 Thinking are closely matched. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.

Our Verdict
Grok 3 Thinking
Grok 3 ThinkingWinner
GPT-4o (Omni)
GPT-4o (Omni)Runner-up

Votes are tied. Grok 3 Thinking is newer and likely incorporates more recent improvements.

Too close to call
Writing DNA

Style Comparison

Similarity
98%

GPT-4o (Omni) uses 2.5x more emoji

GPT-4o (Omni)
Grok 3 Thinking
54%Vocabulary46%
18wSentence Length19w
0.72Hedging1.11
7.3Bold3.3
5.6Lists2.6
0.03Emoji0.00
1.40Headings0.64
0.26Transitions0.25
Based on 24 + 6 text responses
vs

Ask them anything yourself

GPT-4o (Omni)Grok 3 Thinking

279 AI models invented the same fake scientist.

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

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

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