GPT-5.1 vs Grok 3
Compare GPT-5.1 by OpenAI against Grok 3 by xAI, context windows of 400K vs 128K, tested across 51 shared challenges. Updated June 2026.
Which is better, GPT-5.1 or Grok 3?
GPT-5.1 and Grok 3 are both competitive models. Context windows: 400K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.1 and Grok 3
GPT-5.1 is made by openai while Grok 3 is from xai. GPT-5.1 has a 400K token context window compared to Grok 3's 128K.
Our Verdict
GPT-5.1
Grok 3Runner-up
No community votes yet. On paper, GPT-5.1 has the edge — newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1
Input
$1.25
Output
$10.00
Grok 3
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
33%
Grok 3 uses 3.9x more emoji
GPT-5.1
Grok 3
62%Vocabulary49%
19wSentence Length18w
0.29Hedging0.94
3.5Bold2.5
7.2Lists3.0
0.00Emoji0.04
0.61Headings0.65
0.03Transitions0.08
Based on 14 + 17 text responses
Research
What we learned reading every model
FAQ
