Claude Opus 4.1 vs Gemini 2.5 Flash Preview (thinking)
Compare Claude Opus 4.1 by Anthropic against Gemini 2.5 Flash Preview (thinking) by Google AI, context windows of 200K vs 1.0M, tested across 20 shared challenges.
Our Verdict
Claude Opus 4.1
Gemini 2.5 Flash Preview (thinking)Runner-up
No community votes yet. On paper, Claude Opus 4.1 has the edge — bigger model tier, newer.
Gemini 2.5 Flash Preview (thinking) is 21x 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 (thinking)
Input
$0.17
86× cheaper
Output
$3.50
21× cheaper
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 86× input, 21× output
Writing DNA
Style Comparison
Similarity
31%
Claude Opus 4.1 uses 38.4x more emoji
Claude Opus 4.1
Gemini 2.5 Flash Preview (thinking)
61%Vocabulary53%
87wSentence Length14w
0.54Hedging0.38
5.1Bold4.4
6.7Lists4.1
0.38Emoji0.00
1.68Headings0.00
0.13Transitions0.24
Based on 17 + 7 text responses
Research
What we learned reading every model
FAQ
