GPT-5.4 Nano vs xAI: Grok 4.5
Compare GPT-5.4 Nano by OpenAI against xAI: Grok 4.5 by xAI, context windows of 400K vs 500K, tested across 53 shared challenges.
Our Verdict
xAI: Grok 4.5
GPT-5.4 NanoRunner-up
No community votes yet. On paper, xAI: Grok 4.5 has the edge — bigger model tier, newer.
GPT-5.4 Nano is 4.8x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.4 Nano
Input
$0.20
10× cheaper
Output
$1.25
4.8× cheaper
xAI: Grok 4.5
Input
$2.00
Output
$6.00
GPT-5.4 Nano is cheaper on both — 10× input, 4.8× output
Writing DNA
Style Comparison
Similarity
38%
xAI: Grok 4.5 uses 9.0x more emoji
GPT-5.4 Nano
xAI: Grok 4.5
51%Vocabulary61%
21wSentence Length16w
0.58Hedging0.23
7.1Bold2.5
5.5Lists2.4
0.01Emoji0.09
1.39Headings0.48
0.05Transitions0.06
Based on 23 + 27 text responses
Research
What we learned reading every model
FAQ
