GPT-5.1-Codex vs Grok 3
Compare GPT-5.1-Codex by OpenAI against Grok 3 by xAI, context windows of 400K vs 128K, tested across 52 shared challenges. Updated May 2026.
Which is better, GPT-5.1-Codex or Grok 3?
GPT-5.1-Codex 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-Codex and Grok 3
GPT-5.1-Codex is made by openai while Grok 3 is from xai. GPT-5.1-Codex has a 400K token context window compared to Grok 3's 128K.
API pricing
Per 1M tokens
GPT-5.1-Codex
Input
$1.25
Output
$10.00
Grok 3
Input
—
Output
—
Our Verdict
GPT-5.1-Codex
Grok 3Runner-up
No community votes yet. On paper, GPT-5.1-Codex has the edge — newer, bigger context window.
Too close to call
Writing DNA
Style Comparison
Similarity
41%
Grok 3 uses 3.9x more emoji
GPT-5.1-Codex
Grok 3
70%Vocabulary49%
17wSentence Length18w
0.39Hedging0.94
3.4Bold2.5
3.5Lists3.0
0.00Emoji0.04
0.50Headings0.65
0.38Transitions0.08
Based on 14 + 17 text responses
FAQ
