Google: Gemini 2.5 Flash Preview 09-2025 vs xAI: Grok 4
Compare Google: Gemini 2.5 Flash Preview 09-2025 by Google AI against xAI: Grok 4 by xAI, context windows of 1.0M vs 256K, tested across 50 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
xAI: Grok 4Runner-up
No community votes yet. On paper, Google: Gemini 2.5 Flash Preview 09-2025 has the edge — bigger model tier, newer, bigger context window.
Google: Gemini 2.5 Flash Preview 09-2025 is 6.0x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
10× cheaper
Output
$2.50
6.0× cheaper
xAI: Grok 4
Input
$3.00
Output
$15.00
Google: Gemini 2.5 Flash Preview 09-2025 is cheaper on both — 10× input, 6.0× output
Writing DNA
Style Comparison
Similarity
73%
Google: Gemini 2.5 Flash Preview 09-2025 uses 4.9x more transitions
Google: Gemini 2.5 Flash Preview 09-2025
xAI: Grok 4
53%Vocabulary53%
19wSentence Length18w
0.30Hedging0.67
5.8Bold2.7
3.1Lists2.7
0.14Emoji0.07
0.93Headings0.86
0.22Transitions0.04
Based on 22 + 21 text responses
Research
What we learned reading every model
FAQ
