What is the difference between Claude 3 Sonnet and Gemini 3.5 Flash?

Claude 3 Sonnet is developed by Anthropic while Gemini 3.5 Flash is developed by Google AI. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Sonnet or Gemini 3.5 Flash?

It depends on your use case. Claude 3 Sonnet and Gemini 3.5 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

How much does Claude 3 Sonnet cost compared to Gemini 3.5 Flash?

Claude 3 Sonnet costs $3/M input tokens and Gemini 3.5 Flash costs $1.5/M input tokens. Gemini 3.5 Flash is $1.50/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 3 Sonnet and Gemini 3.5 Flash on Rival?

This page shows a side-by-side comparison of Claude 3 Sonnet and Gemini 3.5 Flash 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 Sonnet and Gemini 3.5 Flash?

Claude 3 Sonnet is developed by Anthropic while Gemini 3.5 Flash is developed by Google AI. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Sonnet or Gemini 3.5 Flash?

It depends on your use case. Claude 3 Sonnet and Gemini 3.5 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

How much does Claude 3 Sonnet cost compared to Gemini 3.5 Flash?

Claude 3 Sonnet costs $3/M input tokens and Gemini 3.5 Flash costs $1.5/M input tokens. Gemini 3.5 Flash is $1.50/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 3 Sonnet and Gemini 3.5 Flash on Rival?

This page shows a side-by-side comparison of Claude 3 Sonnet and Gemini 3.5 Flash 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 Sonnet vs Gemini 3.5 Flash: Which Is Better?

Updated May 2026

Our Verdict

Claude 3 Sonnet

Gemini 3.5 Flash

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

Too close to call

What do Claude 3 Sonnet and Gemini 3.5 Flash 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 3 Sonnet

Input

$3.00

Output

$15.00

Gemini 3.5 Flash

Input

$1.50

2.0× cheaper

Output

$9.00

1.7× cheaper

Gemini 3.5 Flash is cheaper on both — 2.0× input, 1.7× output

Writing DNA

Style Comparison

Similarity

45%

Gemini 3.5 Flash uses 442.3x more bold

Claude 3 Sonnet

Gemini 3.5 Flash

48%Vocabulary59%

14wSentence Length18w

0.32Hedging0.16

0.0Bold4.4

3.6Lists3.0

0.00Emoji0.00

0.00Headings0.89

0.38Transitions0.11

Based on 4 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Claude 3 Sonnet vs Ox AlphaNew provider

Claude 3 Sonnet vs MiniMax M3New provider

Claude 3 Sonnet vs Muse Spark 1.1New provider

Updated May 2026

Our Verdict

Claude 3 Sonnet

Gemini 3.5 Flash

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

Too close to call

What do Claude 3 Sonnet and Gemini 3.5 Flash 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 3 Sonnet

Input

$3.00

Output

$15.00

Gemini 3.5 Flash

Input

$1.50

2.0× cheaper

Output

$9.00

1.7× cheaper

Gemini 3.5 Flash is cheaper on both — 2.0× input, 1.7× output

Writing DNA

Style Comparison

Similarity

45%

Gemini 3.5 Flash uses 442.3x more bold

Claude 3 Sonnet

Gemini 3.5 Flash

48%Vocabulary59%

14wSentence Length18w

0.32Hedging0.16

0.0Bold4.4

3.6Lists3.0

0.00Emoji0.00

0.00Headings0.89

0.38Transitions0.11

Based on 4 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Claude 3 Sonnet vs Ox AlphaNew provider

Claude 3 Sonnet vs MiniMax M3New provider

Claude 3 Sonnet vs Muse Spark 1.1New provider