Gemini 2.5 Flash Preview vs xAI: Grok 4
Compare Gemini 2.5 Flash Preview by Google AI against xAI: Grok 4 by xAI, context windows of 1.0M vs 256K, tested across 26 shared challenges.
Our Verdict
xAI: Grok 4
Gemini 2.5 Flash PreviewRunner-up
No community votes yet. On paper, xAI: Grok 4 has the edge — bigger model tier, newer.
Gemini 2.5 Flash Preview is 25x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview
Input
$0.15
20× cheaper
Output
$0.60
25× cheaper
xAI: Grok 4
Input
$3.00
Output
$15.00
Gemini 2.5 Flash Preview is cheaper on both — 20× input, 25× output
Writing DNA
Style Comparison
Similarity
50%
xAI: Grok 4 uses 7.0x more emoji
Gemini 2.5 Flash Preview
xAI: Grok 4
51%Vocabulary53%
15wSentence Length18w
0.70Hedging0.67
4.1Bold2.7
3.3Lists2.7
0.00Emoji0.07
0.09Headings0.86
0.24Transitions0.04
Based on 12 + 21 text responses
Research
What we learned reading every model
FAQ
