What is the difference between Claude Sonnet 4.5 and Gemini 3.1 Pro Preview?

Claude Sonnet 4.5 is developed by Anthropic while Gemini 3.1 Pro Preview is developed by Google AI. Claude Sonnet 4.5 has a 200K token context window vs Gemini 3.1 Pro Preview's 1.0M. You can compare their actual outputs across 42 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4.5 or Gemini 3.1 Pro Preview?

It depends on your use case. Claude Sonnet 4.5 and Gemini 3.1 Pro Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 42 challenges so you can judge which fits your needs best.

How much does Claude Sonnet 4.5 cost compared to Gemini 3.1 Pro Preview?

Claude Sonnet 4.5 costs $3/M input tokens and Gemini 3.1 Pro Preview costs $2/M input tokens. Gemini 3.1 Pro Preview is $1.00/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 Sonnet 4.5 and Gemini 3.1 Pro Preview on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4.5 and Gemini 3.1 Pro 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 Sonnet 4.5 and Gemini 3.1 Pro Preview?

Claude Sonnet 4.5 is developed by Anthropic while Gemini 3.1 Pro Preview is developed by Google AI. Claude Sonnet 4.5 has a 200K token context window vs Gemini 3.1 Pro Preview's 1.0M. You can compare their actual outputs across 42 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4.5 or Gemini 3.1 Pro Preview?

It depends on your use case. Claude Sonnet 4.5 and Gemini 3.1 Pro Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 42 challenges so you can judge which fits your needs best.

How much does Claude Sonnet 4.5 cost compared to Gemini 3.1 Pro Preview?

Claude Sonnet 4.5 costs $3/M input tokens and Gemini 3.1 Pro Preview costs $2/M input tokens. Gemini 3.1 Pro Preview is $1.00/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 Sonnet 4.5 and Gemini 3.1 Pro Preview on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4.5 and Gemini 3.1 Pro 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 Sonnet 4.5 vs Gemini 3.1 Pro Preview: Which Is Better?

Updated Feb 2026

Our Verdict

Gemini 3.1 Pro Preview

Claude Sonnet 4.5Runner-up

No community votes yet. On paper, Gemini 3.1 Pro Preview has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

Claude Sonnet 4.5

Input

$3.00

Output

$15.00

Gemini 3.1 Pro Preview

Input

$2.00

1.5× cheaper

Output

$12.00

1.3× cheaper

Gemini 3.1 Pro Preview is cheaper on both — 1.5× input, 1.3× output

Writing DNA

Style Comparison

Similarity

29%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude Sonnet 4.5

Gemini 3.1 Pro Preview

64%Vocabulary54%

94wSentence Length18w

0.48Hedging0.29

4.9Bold4.9

8.0Lists3.3

0.45Emoji0.00

1.91Headings0.72

0.07Transitions0.14

Based on 20 + 23 text responses

Research

What we learned reading every model

Claude Sonnet 4.5 and Gemini 3.1 Pro Preview 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 Sonnet 4.5 vs MiniMax M3New provider

Claude Sonnet 4.5 vs Gemini 3.6 FlashCross-provider

Claude Sonnet 4.5 vs GPT-5New provider

Updated Feb 2026

Our Verdict

Gemini 3.1 Pro Preview

Claude Sonnet 4.5Runner-up

No community votes yet. On paper, Gemini 3.1 Pro Preview has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

Claude Sonnet 4.5

Input

$3.00

Output

$15.00

Gemini 3.1 Pro Preview

Input

$2.00

1.5× cheaper

Output

$12.00

1.3× cheaper

Gemini 3.1 Pro Preview is cheaper on both — 1.5× input, 1.3× output

Writing DNA

Style Comparison

Similarity

29%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude Sonnet 4.5

Gemini 3.1 Pro Preview

64%Vocabulary54%

94wSentence Length18w

0.48Hedging0.29

4.9Bold4.9

8.0Lists3.3

0.45Emoji0.00

1.91Headings0.72

0.07Transitions0.14

Based on 20 + 23 text responses

Research

What we learned reading every model

Claude Sonnet 4.5 and Gemini 3.1 Pro Preview 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 Sonnet 4.5 vs MiniMax M3New provider

Claude Sonnet 4.5 vs Gemini 3.6 FlashCross-provider

Claude Sonnet 4.5 vs GPT-5New provider