GPT-5.1-Codex-Mini vs xAI: Grok 4
Compare GPT-5.1-Codex-Mini by OpenAI against xAI: Grok 4 by xAI, context windows of 400K vs 256K, tested across 53 shared challenges.
Our Verdict
GPT-5.1-Codex-Mini
xAI: Grok 4Runner-up
No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — bigger model tier, newer, bigger context window.
Slight edge
API pricing
Cost per 1M tokens
GPT-5.1-Codex-Mini
Input
$1.50
2.0× cheaper
Output
$6.00
2.5× cheaper
xAI: Grok 4
Input
$3.00
Output
$15.00
GPT-5.1-Codex-Mini is cheaper on both — 2.0× input, 2.5× output
Writing DNA
Style Comparison
Similarity
56%
xAI: Grok 4 uses 7.0x more emoji
GPT-5.1-Codex-Mini
xAI: Grok 4
65%Vocabulary53%
20wSentence Length18w
0.56Hedging0.67
3.3Bold2.7
3.4Lists2.7
0.00Emoji0.07
0.08Headings0.86
0.05Transitions0.04
Based on 13 + 21 text responses
Research
What we learned reading every model
FAQ
