GPT-5.1 Codex Max vs Grok 3
Compare GPT-5.1 Codex Max by OpenAI against Grok 3 by xAI, tested across 52 shared challenges. Updated June 2026.
Which is better, GPT-5.1 Codex Max or Grok 3?
GPT-5.1 Codex Max and Grok 3 are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-5.1 Codex Max and Grok 3
GPT-5.1 Codex Max is made by openai while Grok 3 is from xai.
Our Verdict
GPT-5.1 Codex Max
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
48%
Grok 3 uses 3.9x more emoji
GPT-5.1 Codex Max
Grok 3
60%Vocabulary49%
16wSentence Length18w
0.36Hedging0.94
2.3Bold2.5
4.2Lists3.0
0.00Emoji0.04
0.12Headings0.65
0.03Transitions0.08
Based on 13 + 17 text responses
FAQ
