GPT-5.1 Codex Max vs xAI: Grok 4.3
Compare GPT-5.1 Codex Max by OpenAI against xAI: Grok 4.3 by xAI, tested across 52 shared challenges.
Our Verdict
GPT-5.1 Codex Max
xAI: Grok 4.3
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
API pricing
Cost per 1M tokens
GPT-5.1 Codex Max
Input
—
Output
—
xAI: Grok 4.3
Input
$1.25
Output
$2.50
Writing DNA
Style Comparison
Similarity
72%
xAI: Grok 4.3 uses 5.4x more transitions
GPT-5.1 Codex Max
xAI: Grok 4.3
60%Vocabulary62%
16wSentence Length16w
0.36Hedging0.46
2.3Bold2.3
4.2Lists2.5
0.00Emoji0.00
0.12Headings0.34
0.03Transitions0.14
Based on 13 + 27 text responses
Research
What we learned reading every model
FAQ
