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  5. Claude 3.7 SonnetvsGemini 2.5 Flash Preview 05-20 (thinking)
Updated May 2025

Claude 3.7 SonnetvsGemini 2.5 Flash Preview 05-20 (thinking)

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than Claude 3.7 Sonnet at $0.15/M vs $3/M input tokens.

Claude 3.7 Sonnet and Gemini 2.5 Flash Preview 05-20 (thinking) compared across 12 shared prompts
SpecClaude 3.7 SonnetGemini 2.5 Flash Preview 05-20 (thinking)
Input price$3/M tokens$0.15/M tokens
Output price$15/M tokens$3.5/M tokens
Context window200K tokens1.0M tokens
ParametersNot disclosedNot disclosed
Free API (OpenRouter)NoNo
ReleasedFeb 2025May 2025
Side by side

Same prompt, both answers

Opening lines from 3 of the 12 prompts both answered. Formatting stripped, words untouched.

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Claude 3.7 Sonnet404 words
3-Minute Stand-Up Comedy Routine Here's a 3-minute stand-up comedy routine that doesn't rely on puns: [walks on stage, adjusts microphone] Hey everyone! Great to be here tonight. I just flew in from therapy, and boy, are my emotional defense mechanisms tired. I've been trying to get in shape lately.
Read the full answer
Gemini 2.5 Flash Preview 05-20 (thinking)467 words
(Lights up on a stage. Comedian walks to center, adjusts mic, smiles warmly.) \"Alright, alright, settle down you crazy people! Thanks for having me. (Pause fo r applause/laughter) You know, I was scrolling through Instagram earlier, and it\'s just a constant ba rrage of people \'living thei r best life,\' isn\'t it?
Read the full answer

Math Misconception Test

Is 9.11 greater than 9.9?

Claude 3.7 Sonnet110 words
Yes, 9.11 is greater than 9.9. When comparing decimal numbers, we look at the digits from left to right. Both numbers have the same digit in the ones place (9), so we move to the tenths place: 9.11 has 1 in the tenths place 9.9 has 9 in the tenths place Since 1 is less than 9, it might seem like 9.9 should be greater.
Read the full answer
Gemini 2.5 Flash Preview 05-20 (thinking)78 words
No, 9.11 is not greater than 9.9. Here\'s how to compare them: Compare the whole numbers: Both have 9. Compare the first digit after the decimal point (the tenths place): In 9.11, the digit is 1. In 9.9, the digit is 9. Since 1 is less than 9, 9.11 is less than 9.9. You can also think of 9.9 as 9.90.
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3.7 Sonnet78 words
5 Jokes Why don't scientists trust atoms? Because they make up everything! I told my wife she was drawing her eyebrows too high. She looked surprised. What do you call a fake noodle? An impasta! Why don't scientists trust atoms? Because they make up everything! How does a penguin build its house? Igloos it together!
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Gemini 2.5 Flash Preview 05-20 (thinking)93 words
Here are 5 jokes: Why don\'t scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field! I told my wife she was drawing her eyebrows too high. She looked surprised.
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Our Verdict
Claude 3.7 Sonnet
Claude 3.7 Sonnet
Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 2.5 Flash Preview 05-20 (thinking)

Not enough votes to call it. On the specs, nothing separates them.

Gemini 2.5 Flash Preview 05-20 (thinking) costs 4.3x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet
Input
$3.00
Output
$15.00
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
20× cheaper
Output
$3.50
4.3× cheaper

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both: 20× input, 4.3× output.

Writing DNA

Style Comparison

Similarity
46%

Claude 3.7 Sonnet uses 83.1x more hedging

Claude 3.7 Sonnet
Gemini 2.5 Flash Preview 05-20 (thinking)
61%Vocabulary70%
33wSentence Length11w
0.83Hedging0.00
2.2Bold4.2
4.9Lists7.3
0.00Emoji0.00
1.78Headings0.00
0.16Transitions0.00
Based on 26 + 3 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3.7 Sonnet is developed by Anthropic while Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI. Claude 3.7 Sonnet has a 200K token context window vs Gemini 2.5 Flash Preview 05-20 (thinking)'s 1.0M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3.7 Sonnet and Gemini 2.5 Flash Preview 05-20 (thinking) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

Claude 3.7 Sonnet costs $3/M input tokens and Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $2.85/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude 3.7 Sonnet and Gemini 2.5 Flash Preview 05-20 (thinking) across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

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Model pages

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