GPT-5.1-Codex vs xAI: Grok 4.3
Compare GPT-5.1-Codex by OpenAI against xAI: Grok 4.3 by xAI, context windows of 400K vs 1.0M, tested across 52 shared challenges.
Our Verdict
GPT-5.1-Codex
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.
xAI: Grok 4.3 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
Input
$1.25
Output
$10.00
xAI: Grok 4.3
Input
$1.25
Output
$2.50
4.0× cheaper
Writing DNA
Style Comparison
Similarity
72%
GPT-5.1-Codex uses 2.7x more transitions
GPT-5.1-Codex
xAI: Grok 4.3
70%Vocabulary62%
17wSentence Length16w
0.39Hedging0.46
3.4Bold2.3
3.5Lists2.5
0.00Emoji0.00
0.50Headings0.34
0.38Transitions0.14
Based on 14 + 27 text responses
Research
What we learned reading every model
FAQ
