Claude Opus 4 vs Gemini 2.5 Flash Preview (thinking)
Compare Claude Opus 4 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
Gemini 2.5 Flash Preview (thinking)Runner-up
No community votes yet. On paper, Claude Opus 4 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
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
40%
Claude Opus 4 uses 11.2x more emoji
Claude Opus 4
Gemini 2.5 Flash Preview (thinking)
64%Vocabulary53%
62wSentence Length14w
0.52Hedging0.38
4.4Bold4.4
9.1Lists4.1
0.11Emoji0.00
1.87Headings0.00
0.27Transitions0.24
Based on 16 + 7 text responses
Research
What we learned reading every model
FAQ
