GPT-5.1 Chat vs xAI: Grok 4
Compare GPT-5.1 Chat by OpenAI against xAI: Grok 4 by xAI, in 2 community votes, gpt-5.1 chat and xai: grok 4 are closely matched, context windows of 128K vs 256K, tested across 52 shared challenges.
Reasoning: GPT-5.1 Chat and xAI: Grok 4 are tied
Our Verdict
GPT-5.1 ChatWinner
xAI: Grok 4Runner-up
Votes are tied. GPT-5.1 Chat is newer and likely incorporates more recent improvements.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1 Chat
Input
$1.25
2.4× cheaper
Output
$10.00
1.5× cheaper
xAI: Grok 4
Input
$3.00
Output
$15.00
GPT-5.1 Chat is cheaper on both — 2.4× input, 1.5× output
Writing DNA
Style Comparison
Similarity
38%
xAI: Grok 4 uses 7.0x more emoji
GPT-5.1 Chat
xAI: Grok 4
73%Vocabulary53%
18wSentence Length18w
0.45Hedging0.67
1.1Bold2.7
2.4Lists2.7
0.00Emoji0.07
0.00Headings0.86
0.06Transitions0.04
Based on 15 + 21 text responses
Research
What we learned reading every model
FAQ
