Gemini 2.5 Flash Preview (thinking) vs xAI: Grok 4.5
Compare Gemini 2.5 Flash Preview (thinking) by Google AI against xAI: Grok 4.5 by xAI, context windows of 1.0M vs 500K, tested across 20 shared challenges.
Our Verdict
xAI: Grok 4.5
Gemini 2.5 Flash Preview (thinking)Runner-up
No community votes yet. On paper, xAI: Grok 4.5 has the edge — bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
11× cheaper
Output
$3.50
1.7× cheaper
xAI: Grok 4.5
Input
$2.00
Output
$6.00
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 11× input, 1.7× output
Writing DNA
Style Comparison
Similarity
50%
xAI: Grok 4.5 uses 9.0x more emoji
Gemini 2.5 Flash Preview (thinking)
xAI: Grok 4.5
53%Vocabulary61%
14wSentence Length16w
0.38Hedging0.23
4.4Bold2.5
4.1Lists2.4
0.00Emoji0.09
0.00Headings0.48
0.24Transitions0.06
Based on 7 + 27 text responses
Research
What we learned reading every model
FAQ
