Gemini 2.5 Flash Preview (thinking) vs Grok 4.20 Beta
Compare Gemini 2.5 Flash Preview (thinking) by Google AI against Grok 4.20 Beta by xAI, context windows of 1.0M vs 2.0M, tested across 20 shared challenges.
Our Verdict
Grok 4.20 Beta
Gemini 2.5 Flash Preview (thinking)Runner-up
No community votes yet. On paper, Grok 4.20 Beta has the edge — bigger model tier, newer, bigger context window.
Slight edge
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
11× cheaper
Output
$3.50
1.7× cheaper
Grok 4.20 Beta
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
57%
Grok 4.20 Beta uses 61.7x more headings
Gemini 2.5 Flash Preview (thinking)
Grok 4.20 Beta
53%Vocabulary57%
14wSentence Length20w
0.38Hedging0.35
4.4Bold4.2
4.1Lists3.7
0.00Emoji0.00
0.00Headings0.62
0.24Transitions0.14
Based on 7 + 23 text responses
Research
What we learned reading every model
FAQ
