What is the difference between Claude Opus 5 and Gemini 3 Flash Preview?

Claude Opus 5 is developed by Anthropic while Gemini 3 Flash Preview is developed by Google AI. Claude Opus 5 has a 1.0M token context window vs Gemini 3 Flash Preview's 1.0M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Gemini 3 Flash Preview?

It depends on your use case. Claude Opus 5 and Gemini 3 Flash Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Claude Opus 5 cost compared to Gemini 3 Flash Preview?

Claude Opus 5 costs $5/M input tokens and Gemini 3 Flash Preview costs $0.5/M input tokens. Gemini 3 Flash Preview is $4.50/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 Opus 5 and Gemini 3 Flash Preview on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and Gemini 3 Flash Preview 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 Opus 5 and Gemini 3 Flash Preview?

Claude Opus 5 is developed by Anthropic while Gemini 3 Flash Preview is developed by Google AI. Claude Opus 5 has a 1.0M token context window vs Gemini 3 Flash Preview's 1.0M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Gemini 3 Flash Preview?

It depends on your use case. Claude Opus 5 and Gemini 3 Flash Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Claude Opus 5 cost compared to Gemini 3 Flash Preview?

Claude Opus 5 costs $5/M input tokens and Gemini 3 Flash Preview costs $0.5/M input tokens. Gemini 3 Flash Preview is $4.50/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 Opus 5 and Gemini 3 Flash Preview on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and Gemini 3 Flash Preview 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 Opus 5 vs Gemini 3 Flash Preview: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 5

Gemini 3 Flash PreviewRunner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer.

Gemini 3 Flash Preview is 8.3x cheaper per token — worth considering if cost matters.

Too close to call

What do Claude Opus 5 and Gemini 3 Flash Preview say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Gemini 3 Flash Preview

Input

$0.50

10× cheaper

Output

$3.00

8.3× cheaper

Gemini 3 Flash Preview is cheaper on both — 10× input, 8.3× output

Writing DNA

Style Comparison

Similarity

59%

Claude Opus 5 uses 1.7x more emoji

Claude Opus 5

Gemini 3 Flash Preview

54%Vocabulary55%

21wSentence Length18w

0.40Hedging0.42

3.9Bold7.1

1.9Lists4.5

0.02Emoji0.00

0.71Headings0.84

0.05Transitions0.07

Based on 27 + 24 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Claude Opus 5 vs MiniMax M3New provider

Claude Opus 5 vs GPT-5New provider

Claude Opus 5 vs Muse Spark 1.1New provider

Updated Jul 2026

Our Verdict

Claude Opus 5

Gemini 3 Flash PreviewRunner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer.

Gemini 3 Flash Preview is 8.3x cheaper per token — worth considering if cost matters.

Too close to call

What do Claude Opus 5 and Gemini 3 Flash Preview say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Gemini 3 Flash Preview

Input

$0.50

10× cheaper

Output

$3.00

8.3× cheaper

Gemini 3 Flash Preview is cheaper on both — 10× input, 8.3× output

Writing DNA

Style Comparison

Similarity

59%

Claude Opus 5 uses 1.7x more emoji

Claude Opus 5

Gemini 3 Flash Preview

54%Vocabulary55%

21wSentence Length18w

0.40Hedging0.42

3.9Bold7.1

1.9Lists4.5

0.02Emoji0.00

0.71Headings0.84

0.05Transitions0.07

Based on 27 + 24 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Claude Opus 5 vs MiniMax M3New provider

Claude Opus 5 vs GPT-5New provider

Claude Opus 5 vs Muse Spark 1.1New provider