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

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.

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

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.

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

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.

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

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.

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

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.

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

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.

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

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.

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

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.

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

Updated Apr 2025

Our Verdict

Claude 3 Opus

Gemini 2.5 Flash Preview (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 (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 (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

85%

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

Claude 3 Opus and Gemini 2.5 Flash Preview (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

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Claude 3 Opus vs MiniMax M3New provider

Updated Apr 2025

Our Verdict

Claude 3 Opus

Gemini 2.5 Flash Preview (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 (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 (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

85%

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

Claude 3 Opus and Gemini 2.5 Flash Preview (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