GPT-5.5 vs xAI: Grok 4.3
Compare GPT-5.5 by OpenAI against xAI: Grok 4.3 by xAI, context windows of 1.1M vs 1.0M, tested across 54 shared challenges.
Our Verdict
GPT-5.5
xAI: Grok 4.3Runner-up
No community votes yet. On paper, GPT-5.5 has the edge — bigger model tier.
xAI: Grok 4.3 is 12x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.5
Input
$5.00
Output
$30.00
xAI: Grok 4.3
Input
$1.25
4.0× cheaper
Output
$2.50
12× cheaper
xAI: Grok 4.3 is cheaper on both — 4.0× input, 12× output
Writing DNA
Style Comparison
Similarity
49%
GPT-5.5 uses 4.9x more headings
GPT-5.5
xAI: Grok 4.3
58%Vocabulary62%
18wSentence Length16w
0.74Hedging0.46
2.9Bold2.3
5.1Lists2.5
0.00Emoji0.00
1.68Headings0.34
0.03Transitions0.14
Based on 26 + 27 text responses
Research
What we learned reading every model
FAQ
