Claude Sonnet 5 vs Gemini 2.5 Flash Preview 05-20 (thinking)
Compare Claude Sonnet 5 by Anthropic against Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI, context windows of 1.0M vs 1.0M, tested across 11 shared challenges.
Our Verdict
Claude Sonnet 5
Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up
No community votes yet. On paper, Claude Sonnet 5 has the edge — bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 5
Input
$2.00
Output
$10.00
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
13× cheaper
Output
$3.50
2.9× cheaper
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 13× input, 2.9× output
Writing DNA
Style Comparison
Similarity
49%
Claude Sonnet 5 uses 52.8x more hedging
Claude Sonnet 5
Gemini 2.5 Flash Preview 05-20 (thinking)
59%Vocabulary70%
35wSentence Length11w
0.53Hedging0.00
3.5Bold4.2
3.5Lists7.3
0.79Emoji0.00
1.25Headings0.00
0.06Transitions0.00
Based on 27 + 3 text responses
Research
What we learned reading every model
FAQ
