xAI: Grok 4.3 vs OpenAI o3
Compare xAI: Grok 4.3 by xAI against OpenAI o3 by OpenAI, tested across 53 shared challenges. Updated May 2026.
Which is better, xAI: Grok 4.3 or OpenAI o3?
xAI: Grok 4.3 and OpenAI o3 are both competitive models. xAI: Grok 4.3 costs $1.25/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.
Key Differences Between xAI: Grok 4.3 and OpenAI o3
xAI: Grok 4.3 is made by xai while OpenAI o3 is from openai. On pricing, xAI: Grok 4.3 costs $1.25/M input tokens vs $10/M for OpenAI o3.
API pricing
Per 1M tokens
xAI: Grok 4.3
Input
$1.25
8.0× cheaper
Output
$2.50
16× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
xAI: Grok 4.3 is cheaper on both — 8.0× input, 16× output
Our Verdict
xAI: Grok 4.3
OpenAI o3
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 16x cheaper per token — worth considering if cost matters.
Too close to call
Writing DNA
Style Comparison
Similarity
68%
xAI: Grok 4.3 uses 3.2x more bold
xAI: Grok 4.3
OpenAI o3
62%Vocabulary68%
16wSentence Length14w
0.46Hedging0.26
2.3Bold0.7
2.5Lists3.0
0.00Emoji0.00
0.34Headings0.38
0.14Transitions0.12
Based on 27 + 16 text responses
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