GPT-4.5 vs Grok 3 Thinking

Compare GPT-4.5 by OpenAI against Grok 3 Thinking by xAI, in 10 community votes, gpt-4.5 wins 83% of head-to-head duels, context windows of 128K vs 128K, tested across 13 shared challenges. Updated April 2026.

Which is better, GPT-4.5 or Grok 3 Thinking?

GPT-4.5 is the better choice overall, winning 83% of 10 blind community votes on Rival. Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4.5 and Grok 3 Thinking

GPT-4.5 is made by openai while Grok 3 Thinking is from xai. GPT-4.5 has a 128K token context window compared to Grok 3 Thinking's 128K. In community voting, In 10 community votes, GPT-4.5 wins 83% of head-to-head duels.

In 10 community votes, GPT-4.5 wins 83% of head-to-head duels. GPT-4.5 leads in Web Design, Image Generation. Based on blind community voting from the Rival open dataset of 10+ human preference judgments for this pair.

Web Design: GPT-4.5 wins 100% of votes
Image Generation: GPT-4.5 wins 100% of votes
Our Verdict
GPT-4.5
GPT-4.5Winner
Grok 3 Thinking
Grok 3 ThinkingRunner-up

Pick GPT-4.5. In 10 blind votes, GPT-4.5 wins 83% of the time. That's not luck.

GPT-4.5 particularly excels in Web Design, Image Generation.

Clear winner
Writing DNA

Style Comparison

Similarity
100%

GPT-4.5 uses 2.5x more lists

GPT-4.5
Grok 3 Thinking
63%Vocabulary46%
16wSentence Length19w
0.57Hedging1.11
4.7Bold3.3
6.4Lists2.6
0.00Emoji0.00
1.30Headings0.64
0.54Transitions0.25
Based on 11 + 6 text responses
vs

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GPT-4.5Grok 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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