Grok Code Fast 1 vs OpenAI o3
Compare Grok Code Fast 1 by xAI against OpenAI o3 by OpenAI, tested across 54 shared challenges. Updated May 2026.
Which is better, Grok Code Fast 1 or OpenAI o3?
Grok Code Fast 1 and OpenAI o3 are both competitive models. Grok Code Fast 1 costs $0.2/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.
Key Differences Between Grok Code Fast 1 and OpenAI o3
Grok Code Fast 1 is made by xai while OpenAI o3 is from openai. On pricing, Grok Code Fast 1 costs $0.2/M input tokens vs $10/M for OpenAI o3.
API pricing
Per 1M tokens
Grok Code Fast 1
Input
$0.20
50× cheaper
Output
$1.50
27× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Grok Code Fast 1 is cheaper on both — 50× input, 27× output
Our Verdict
Grok Code Fast 1
OpenAI o3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Grok Code Fast 1 is 27x cheaper per token — worth considering if cost matters.
Too close to call
Writing DNA
Style Comparison
Similarity
56%
Grok Code Fast 1 uses 6.0x more emoji
Grok Code Fast 1
OpenAI o3
60%Vocabulary68%
17wSentence Length14w
0.97Hedging0.26
2.8Bold0.7
2.5Lists3.0
0.06Emoji0.00
0.89Headings0.38
0.11Transitions0.12
Based on 23 + 16 text responses
FAQ
