Claude Opus 4.1 vs Gemini 2.5 Flash Preview
Compare Claude Opus 4.1 by Anthropic against Gemini 2.5 Flash Preview by Google AI, context windows of 200K vs 1.0M, tested across 26 shared challenges.
Our Verdict
Claude Opus 4.1
Gemini 2.5 Flash PreviewRunner-up
No community votes yet. On paper, Claude Opus 4.1 has the edge — bigger model tier, newer.
Gemini 2.5 Flash Preview is 125x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.1
Input
$15.00
Output
$75.00
Gemini 2.5 Flash Preview
Input
$0.15
100× cheaper
Output
$0.60
125× cheaper
Gemini 2.5 Flash Preview is cheaper on both — 100× input, 125× output
Writing DNA
Style Comparison
Similarity
35%
Claude Opus 4.1 uses 38.4x more emoji
Claude Opus 4.1
Gemini 2.5 Flash Preview
61%Vocabulary51%
87wSentence Length15w
0.54Hedging0.70
5.1Bold4.1
6.7Lists3.3
0.38Emoji0.00
1.68Headings0.09
0.13Transitions0.24
Based on 17 + 12 text responses
Research
What we learned reading every model
FAQ
