What is the difference between Claude 3 Opus and Gemini 2.5 Flash Preview 05-20 (thinking)?

Claude 3 Opus is developed by Anthropic while Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI. Claude 3 Opus 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 9 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or Gemini 2.5 Flash Preview 05-20 (thinking)?

It depends on your use case. Claude 3 Opus 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 9 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to Gemini 2.5 Flash Preview 05-20 (thinking)?

Claude 3 Opus costs $15/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 $14.85/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude 3 Opus and Gemini 2.5 Flash Preview 05-20 (thinking) on Rival?

This page shows a side-by-side comparison of Claude 3 Opus 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.

What is the difference between Claude 3 Opus and Gemini 2.5 Flash Preview 05-20 (thinking)?

Claude 3 Opus is developed by Anthropic while Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI. Claude 3 Opus 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 9 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or Gemini 2.5 Flash Preview 05-20 (thinking)?

It depends on your use case. Claude 3 Opus 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 9 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to Gemini 2.5 Flash Preview 05-20 (thinking)?

Claude 3 Opus costs $15/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 $14.85/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude 3 Opus and Gemini 2.5 Flash Preview 05-20 (thinking) on Rival?

This page shows a side-by-side comparison of Claude 3 Opus 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.

Claude 3 Opus vs Gemini 2.5 Flash Preview 05-20 (thinking): Which Is Better?

Updated May 2025

Our Verdict

Claude 3 Opus

Gemini 2.5 Flash Preview 05-20 (thinking)

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

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 3 Opus

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

75%

Claude 3 Opus uses 48.1x more hedging

Claude 3 Opus

Gemini 2.5 Flash Preview 05-20 (thinking)

54%Vocabulary70%

14wSentence Length11w

0.48Hedging0.00

0.0Bold4.2

3.0Lists7.3

0.00Emoji0.00

0.00Headings0.00

0.06Transitions0.00

Based on 3 + 3 text responses

Research

What we learned reading every model

Claude 3 Opus and Gemini 2.5 Flash Preview 05-20 (thinking) have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Claude 3 Opus vs Llama 4 MaverickNew provider

Claude 3 Opus vs GPT-5New provider

Claude 3 Opus vs MiniMax M3New provider

Updated May 2025

Our Verdict

Claude 3 Opus

Gemini 2.5 Flash Preview 05-20 (thinking)

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

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 3 Opus

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

75%

Claude 3 Opus uses 48.1x more hedging

Claude 3 Opus

Gemini 2.5 Flash Preview 05-20 (thinking)

54%Vocabulary70%

14wSentence Length11w

0.48Hedging0.00

0.0Bold4.2

3.0Lists7.3

0.00Emoji0.00

0.00Headings0.00

0.06Transitions0.00

Based on 3 + 3 text responses

Research

What we learned reading every model

Claude 3 Opus and Gemini 2.5 Flash Preview 05-20 (thinking) have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Claude 3 Opus vs Llama 4 MaverickNew provider

Claude 3 Opus vs GPT-5New provider

Claude 3 Opus vs MiniMax M3New provider