Grok 3 vs GPT-5

Compare Grok 3 by xAI against GPT-5 by OpenAI, in 9 community votes, gpt-5 wins 86% of head-to-head duels, context windows of 128K vs 400K, tested across 46 shared challenges. Updated April 2026.

Which is better, Grok 3 or GPT-5?

GPT-5 is the better choice overall, winning 86% of 9 blind community votes on Rival. Context windows: 128K vs 400K tokens. Compare their real outputs side by side below.

Key Differences Between Grok 3 and GPT-5

Grok 3 is made by xai while GPT-5 is from openai. Grok 3 has a 128K token context window compared to GPT-5's 400K. In community voting, In 9 community votes, GPT-5 wins 86% of head-to-head duels.

In 9 community votes, GPT-5 wins 86% of head-to-head duels. GPT-5 leads in Reasoning. Based on blind community voting from the Rival open dataset of 9+ human preference judgments for this pair.

Reasoning: GPT-5 wins 100% of votes
Analysis: Grok 3 and GPT-5 are tied
Our Verdict
GPT-5
GPT-5Winner
Grok 3
Grok 3Runner-up

Pick GPT-5. In 9 blind votes, GPT-5 wins 86% of the time. That's not luck.

GPT-5 particularly excels in Reasoning.

Clear winner
Writing DNA

Style Comparison

Similarity
97%

Grok 3 uses 3.9x more emoji

Grok 3
GPT-5
49%Vocabulary65%
18wSentence Length13w
0.94Hedging0.20
2.5Bold0.2
3.0Lists4.6
0.04Emoji0.00
0.65Headings0.16
0.08Transitions0.03
Based on 17 + 16 text responses
vs

Ask them anything yourself

Grok 3GPT-5

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

Common questions