GPT-5 Pro vs Grok 3 Thinking

Compare GPT-5 Pro by OpenAI against Grok 3 Thinking by xAI, in 1 community votes, gpt-5 pro wins 100% of head-to-head duels, context windows of 400K vs 128K, tested across 10 shared challenges. Updated April 2026.

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

GPT-5 Pro is the better choice overall, winning 100% of 1 blind community votes on Rival. Context windows: 400K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-5 Pro and Grok 3 Thinking

GPT-5 Pro is made by openai while Grok 3 Thinking is from xai. GPT-5 Pro has a 400K token context window compared to Grok 3 Thinking's 128K. In community voting, In 1 community votes, GPT-5 Pro wins 100% of head-to-head duels.

In 1 community votes, GPT-5 Pro wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.

Our Verdict
GPT-5 Pro
GPT-5 ProWinner
Grok 3 Thinking
Grok 3 ThinkingRunner-up

Pick GPT-5 Pro. In 1 blind votes, GPT-5 Pro wins 100% of the time. That's not luck.

Clear winner
Writing DNA

Style Comparison

Similarity
98%

Grok 3 Thinking uses 334.3x more bold

GPT-5 Pro
Grok 3 Thinking
65%Vocabulary46%
15wSentence Length19w
0.32Hedging1.11
0.0Bold3.3
2.9Lists2.6
0.00Emoji0.00
0.00Headings0.64
0.01Transitions0.25
Based on 11 + 6 text responses
vs

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GPT-5 ProGrok 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
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