Claude Opus 4.1 vs Gemini 2.5 Flash Preview 05-20 (thinking)
Compare Claude Opus 4.1 by Anthropic against Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI, context windows of 200K vs 1.0M, tested across 11 shared challenges.
Our Verdict
Claude Opus 4.1
Gemini 2.5 Flash Preview 05-20 (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 05-20 (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 05-20 (thinking)
Input
$0.15
100× cheaper
Output
$3.50
21× cheaper
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 100× input, 21× output
Writing DNA
Style Comparison
Similarity
41%
Claude Opus 4.1 uses 53.9x more hedging
Claude Opus 4.1
Gemini 2.5 Flash Preview 05-20 (thinking)
61%Vocabulary70%
87wSentence Length11w
0.54Hedging0.00
5.1Bold4.2
6.7Lists7.3
0.38Emoji0.00
1.68Headings0.00
0.13Transitions0.00
Based on 17 + 3 text responses
Research
What we learned reading every model
FAQ
