Claude Sonnet 4.5 vs Grok Code Fast 1
Compare Claude Sonnet 4.5 by Anthropic against Grok Code Fast 1 by xAI, in 32 community votes, claude sonnet 4.5 wins 73% of head-to-head duels, context windows of 200K vs 256K, tested across 43 shared challenges.
Web Design: Claude Sonnet 4.5 wins 78% of votes
Reasoning: Claude Sonnet 4.5 and Grok Code Fast 1 are tied
Image Generation: Claude Sonnet 4.5 wins 100% of votes
Our Verdict
Claude Sonnet 4.5Winner
Grok Code Fast 1Runner-up
Pick Claude Sonnet 4.5. In 32 blind votes, Claude Sonnet 4.5 wins 73% of the time. That's not luck.
Claude Sonnet 4.5 particularly excels in Image Generation, Web Design. Grok Code Fast 1 is 10x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
Grok Code Fast 1
Input
$0.20
15× cheaper
Output
$1.50
10× cheaper
Grok Code Fast 1 is cheaper on both — 15× input, 10× output
Writing DNA
Style Comparison
Similarity
40%
Claude Sonnet 4.5 uses 7.6x more emoji
Claude Sonnet 4.5
Grok Code Fast 1
64%Vocabulary60%
94wSentence Length17w
0.48Hedging0.97
4.9Bold2.8
8.0Lists2.5
0.45Emoji0.06
1.91Headings0.89
0.07Transitions0.11
Based on 20 + 23 text responses
Research
What we learned reading every model
FAQ
