Gemini 2.5 Flash Preview (thinking) vs xAI: Grok 4
Compare Gemini 2.5 Flash Preview (thinking) by Google AI against xAI: Grok 4 by xAI, context windows of 1.0M vs 256K, tested across 20 shared challenges.
Our Verdict
xAI: Grok 4
Gemini 2.5 Flash Preview (thinking)Runner-up
No community votes yet. On paper, xAI: Grok 4 has the edge — bigger model tier, newer.
Gemini 2.5 Flash Preview (thinking) is 4.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
17× cheaper
Output
$3.50
4.3× cheaper
xAI: Grok 4
Input
$3.00
Output
$15.00
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 17× input, 4.3× output
Writing DNA
Style Comparison
Similarity
42%
xAI: Grok 4 uses 7.0x more emoji
Gemini 2.5 Flash Preview (thinking)
xAI: Grok 4
53%Vocabulary53%
14wSentence Length18w
0.38Hedging0.67
4.4Bold2.7
4.1Lists2.7
0.00Emoji0.07
0.00Headings0.86
0.24Transitions0.04
Based on 7 + 21 text responses
Research
What we learned reading every model
FAQ
