GPT-5.1-Codex-Mini vs Grok Code Fast 1
Compare GPT-5.1-Codex-Mini by OpenAI against Grok Code Fast 1 by xAI, in 3 community votes, gpt-5.1-codex-mini and grok code fast 1 are closely matched, context windows of 400K vs 256K, tested across 55 shared challenges.
Our Verdict
GPT-5.1-Codex-MiniWinner
Grok Code Fast 1Runner-up
Votes are tied. GPT-5.1-Codex-Mini is newer and likely incorporates more recent improvements.
Grok Code Fast 1 is 4.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1-Codex-Mini
Input
$1.50
Output
$6.00
Grok Code Fast 1
Input
$0.20
7.5× cheaper
Output
$1.50
4.0× cheaper
Grok Code Fast 1 is cheaper on both — 7.5× input, 4.0× output
Writing DNA
Style Comparison
Similarity
74%
Grok Code Fast 1 uses 6.0x more emoji
GPT-5.1-Codex-Mini
Grok Code Fast 1
65%Vocabulary60%
20wSentence Length17w
0.56Hedging0.97
3.3Bold2.8
3.4Lists2.5
0.00Emoji0.06
0.08Headings0.89
0.05Transitions0.11
Based on 13 + 23 text responses
Research
What we learned reading every model
FAQ
