GPT-5 vs Grok 3 Thinking

Compare GPT-5 by OpenAI against Grok 3 Thinking by xAI, in 4 community votes, grok 3 thinking wins 75% of head-to-head duels, context windows of 400K vs 128K, tested across 14 shared challenges. Updated April 2026.

Which is better, GPT-5 or Grok 3 Thinking?

Grok 3 Thinking is the better choice overall, winning 75% of 4 blind community votes on Rival. Context windows: 400K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-5 and Grok 3 Thinking

GPT-5 is made by openai while Grok 3 Thinking is from xai. GPT-5 has a 400K token context window compared to Grok 3 Thinking's 128K. In community voting, In 4 community votes, Grok 3 Thinking wins 75% of head-to-head duels.

In 4 community votes, Grok 3 Thinking wins 75% of head-to-head duels. Grok 3 Thinking has the edge overall, but performance varies by task type. Based on blind community voting from the Rival open dataset of 4+ human preference judgments for this pair.

Reasoning: GPT-5 and Grok 3 Thinking are tied
Our Verdict
Grok 3 Thinking
Grok 3 ThinkingWinner
GPT-5
GPT-5Runner-up

Pick Grok 3 Thinking. In 4 blind votes, Grok 3 Thinking wins 75% of the time. That's not luck.

Clear winner
Writing DNA

Style Comparison

Similarity
98%

Grok 3 Thinking uses 17.7x more bold

GPT-5
Grok 3 Thinking
65%Vocabulary46%
13wSentence Length19w
0.20Hedging1.11
0.2Bold3.3
4.6Lists2.6
0.00Emoji0.00
0.16Headings0.64
0.03Transitions0.25
Based on 16 + 6 text responses
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GPT-5Grok 3 Thinking

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