Gemini 2.5 Flash Preview vs Grok 4.20 Beta
Compare Gemini 2.5 Flash Preview by Google AI against Grok 4.20 Beta by xAI, context windows of 1.0M vs 2.0M, tested across 26 shared challenges.
Our Verdict
Grok 4.20 Beta
Gemini 2.5 Flash PreviewRunner-up
No community votes yet. On paper, Grok 4.20 Beta has the edge — bigger model tier, newer, bigger context window.
Gemini 2.5 Flash Preview is 10x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview
Input
$0.15
13× cheaper
Output
$0.60
10× cheaper
Grok 4.20 Beta
Input
$2.00
Output
$6.00
Gemini 2.5 Flash Preview is cheaper on both — 13× input, 10× output
Writing DNA
Style Comparison
Similarity
60%
Grok 4.20 Beta uses 7.0x more headings
Gemini 2.5 Flash Preview
Grok 4.20 Beta
51%Vocabulary57%
15wSentence Length20w
0.70Hedging0.35
4.1Bold4.2
3.3Lists3.7
0.00Emoji0.00
0.09Headings0.62
0.24Transitions0.14
Based on 12 + 23 text responses
Research
What we learned reading every model
FAQ
