OpenAI: GPT-5.6 Terra vs xAI: Grok 4.3
Compare OpenAI: GPT-5.6 Terra by OpenAI against xAI: Grok 4.3 by xAI, context windows of 1.1M vs 1.0M, tested across 54 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Terra
xAI: Grok 4.3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
xAI: Grok 4.3 is 6.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
OpenAI: GPT-5.6 Terra
Input
$2.50
Output
$15.00
xAI: Grok 4.3
Input
$1.25
2.0× cheaper
Output
$2.50
6.0× cheaper
xAI: Grok 4.3 is cheaper on both — 2.0× input, 6.0× output
Writing DNA
Style Comparison
Similarity
60%
OpenAI: GPT-5.6 Terra uses 3.3x more headings
OpenAI: GPT-5.6 Terra
xAI: Grok 4.3
57%Vocabulary62%
18wSentence Length16w
0.85Hedging0.46
2.8Bold2.3
4.6Lists2.5
0.00Emoji0.00
1.12Headings0.34
0.06Transitions0.14
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
