Gemini 2.5 Flash Preview vs xAI: Grok 4.3
Compare Gemini 2.5 Flash Preview by Google AI against xAI: Grok 4.3 by xAI, context windows of 1.0M vs 1.0M, tested across 26 shared challenges.
Our Verdict
xAI: Grok 4.3
Gemini 2.5 Flash PreviewRunner-up
No community votes yet. On paper, xAI: Grok 4.3 has the edge — bigger model tier, newer.
Gemini 2.5 Flash Preview is 4.2x 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
8.3× cheaper
Output
$0.60
4.2× cheaper
xAI: Grok 4.3
Input
$1.25
Output
$2.50
Gemini 2.5 Flash Preview is cheaper on both — 8.3× input, 4.2× output
Writing DNA
Style Comparison
Similarity
53%
xAI: Grok 4.3 uses 3.9x more headings
Gemini 2.5 Flash Preview
xAI: Grok 4.3
51%Vocabulary62%
15wSentence Length16w
0.70Hedging0.46
4.1Bold2.3
3.3Lists2.5
0.00Emoji0.00
0.09Headings0.34
0.24Transitions0.14
Based on 12 + 27 text responses
Research
What we learned reading every model
FAQ
