GPT-5 Codex vs Grok 3
Compare GPT-5 Codex by OpenAI against Grok 3 by xAI, tested across 49 shared challenges. Updated May 2026.
Which is better, GPT-5 Codex or Grok 3?
GPT-5 Codex and Grok 3 are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-5 Codex and Grok 3
GPT-5 Codex is made by openai while Grok 3 is from xai.
Our Verdict
GPT-5 Codex
Grok 3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
Writing DNA
Style Comparison
Similarity
53%
GPT-5 Codex uses 3.7x more emoji
GPT-5 Codex
Grok 3
64%Vocabulary49%
17wSentence Length18w
0.38Hedging0.94
2.3Bold2.5
3.5Lists3.0
0.15Emoji0.04
0.49Headings0.65
0.05Transitions0.08
Based on 13 + 17 text responses
FAQ
