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  5. Claude 3 OpusvsGemini 2.5 Flash Preview (thinking)
Updated Apr 2025

Claude 3 OpusvsGemini 2.5 Flash Preview (thinking)

Gemini 2.5 Flash Preview (thinking) is cheaper than Claude 3 Opus at $0.175/M vs $15/M input tokens.

Claude 3 Opus and Gemini 2.5 Flash Preview (thinking) compared across 9 shared prompts
SpecClaude 3 OpusGemini 2.5 Flash Preview (thinking)
Input price$15/M tokens$0.175/M tokens
Output price$75/M tokens$3.5/M tokens
Context window200K tokens1.0M tokens
Free API (OpenRouter)NoNo
ReleasedMar 2024Apr 2025
Side by side

Same prompt, both answers

Opening lines from 2 of the 9 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 Opus390 words
Here's a 3-minute stand-up comedy routine that isn't based on puns: You know what really grinds my gears? Adulthood. I mean, when we were kids, we couldn't wait to grow up. We thought it would be all about staying up late, eating ice cream for breakfast, and doing whatever we wanted. Boy, were we wrong!
Read the full answer
Gemini 2.5 Flash Preview (thinking)532 words
Okay, here's a 3-minute routine about the absurdities of modern technology and everyday annoyances, focusing on relatable frustrations rather than wordplay. (Start) "Alright, alright, settle in! How we doing tonight? Good to be here! Thanks for coming out. So, I've been thinking... we paid for convenience, right?
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3 Opus95 words
Here are 5 jokes I generated: Why don't scientists trust atoms? Because they make up everything! What do you call a boomerang that doesn't come back? A stick. Why was the math book sad? Because it had too many problems. Did you hear about the mathematician who's afraid of negative numbers?
Read the full answer
Gemini 2.5 Flash Preview (thinking)95 words
Okay, here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a fish with no eyes? fsh! Why did the tomato turn red? Because it saw the salad dressing! What has a neck but no head? A bottle. What do you call a lazy kangaroo? Pouch potato!
Read the full answer
Our Verdict
Claude 3 Opus
Claude 3 Opus
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)

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

Gemini 2.5 Flash Preview (thinking) costs 21x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3 Opus
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
84%

Gemini 2.5 Flash Preview (thinking) uses 443.3x more bold

Claude 3 Opus
Gemini 2.5 Flash Preview (thinking)
54%Vocabulary53%
14wSentence Length14w
0.48Hedging0.38
0.0Bold4.4
3.0Lists4.1
0.00Emoji0.00
0.00Headings0.00
0.06Transitions0.24
Based on 3 + 7 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3 Opus is developed by Anthropic while Gemini 2.5 Flash Preview (thinking) is developed by Google AI. Claude 3 Opus has a 200K token context window vs Gemini 2.5 Flash Preview (thinking)'s 1.0M. You can compare their actual outputs across 9 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3 Opus and Gemini 2.5 Flash Preview (thinking) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 9 challenges so you can judge which fits your needs best.

Claude 3 Opus costs $15/M input tokens and Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens. Gemini 2.5 Flash Preview (thinking) is $14.82/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 Opus and Gemini 2.5 Flash Preview (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

Claude 3 Opus logo
Claude 3 Opus12 outputs, specs and price
Gemini 2.5 Flash Preview (thinking) logo
Gemini 2.5 Flash Preview (thinking)20 outputs, specs and price
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