GPT-5.5 vs Grok 3
Compare GPT-5.5 by OpenAI against Grok 3 by xAI, context windows of 1.1M vs 128K, tested across 52 shared challenges. Updated April 2026.
Which is better, GPT-5.5 or Grok 3?
GPT-5.5 and Grok 3 are both competitive models. Context windows: 1050K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.5 and Grok 3
GPT-5.5 is made by openai while Grok 3 is from xai. GPT-5.5 has a 1050K token context window compared to Grok 3's 128K.
API pricing
Per 1M tokens
GPT-5.5
Input
$5.00
Output
$30.00
Grok 3
Input
—
Output
—
Our Verdict
GPT-5.5
Grok 3Runner-up
No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.
Too close to call
Writing DNA
Style Comparison
Similarity
54%
Grok 3 uses 3.9x more emoji
GPT-5.5
Grok 3
58%Vocabulary49%
18wSentence Length18w
0.74Hedging0.94
2.9Bold2.5
5.1Lists3.0
0.00Emoji0.04
1.68Headings0.65
0.03Transitions0.08
Based on 26 + 17 text responses
FAQ
