Claude Opus 4 vs xAI: Grok 4.5
Compare Claude Opus 4 by Anthropic against xAI: Grok 4.5 by xAI, context windows of 200K vs 500K, tested across 53 shared challenges.
Our Verdict
Claude Opus 4
xAI: Grok 4.5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
xAI: Grok 4.5 is 13x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4
Input
$15.00
Output
$75.00
xAI: Grok 4.5
Input
$2.00
7.5× cheaper
Output
$6.00
13× cheaper
xAI: Grok 4.5 is cheaper on both — 7.5× input, 13× output
Writing DNA
Style Comparison
Similarity
40%
Claude Opus 4 uses 4.9x more transitions
Claude Opus 4
xAI: Grok 4.5
64%Vocabulary61%
62wSentence Length16w
0.52Hedging0.23
4.4Bold2.5
9.1Lists2.4
0.11Emoji0.09
1.87Headings0.48
0.27Transitions0.06
Based on 16 + 27 text responses
Research
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