GPT-5 Pro vs Grok Code Fast 1
Compare GPT-5 Pro by OpenAI against Grok Code Fast 1 by xAI, context windows of 400K vs 256K, tested across 42 shared challenges.
Our Verdict
GPT-5 Pro
Grok Code Fast 1Runner-up
No community votes yet. On paper, GPT-5 Pro has the edge — bigger model tier, newer, bigger context window.
Grok Code Fast 1 is 80x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GPT-5 Pro
Input
$15.00
Output
$120.00
Grok Code Fast 1
Input
$0.20
75× cheaper
Output
$1.50
80× cheaper
Grok Code Fast 1 is cheaper on both — 75× input, 80× output
Writing DNA
Style Comparison
Similarity
64%
Grok Code Fast 1 uses 280.1x more bold
GPT-5 Pro
Grok Code Fast 1
65%Vocabulary60%
15wSentence Length17w
0.32Hedging0.97
0.0Bold2.8
2.9Lists2.5
0.00Emoji0.06
0.00Headings0.89
0.01Transitions0.11
Based on 11 + 23 text responses
Research
What we learned reading every model
FAQ
