What is the difference between Claude 2 and Claude Sonnet 4.5?

Both are developed by Anthropic but target different use cases. Claude 2 has a 100K token context window vs Claude Sonnet 4.5's 200K. You can compare their actual outputs across 3 challenges on Rival to see how they differ in practice.

Which is better, Claude 2 or Claude Sonnet 4.5?

It depends on your use case. Claude 2 and Claude Sonnet 4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 3 challenges so you can judge which fits your needs best.

How much does Claude 2 cost compared to Claude Sonnet 4.5?

Claude 2 costs $11.02/M input tokens and Claude Sonnet 4.5 costs $3/M input tokens. Claude Sonnet 4.5 is $8.02/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 2 and Claude Sonnet 4.5 on Rival?

This page shows a side-by-side comparison of Claude 2 and Claude Sonnet 4.5 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 2 and Claude Sonnet 4.5?

Both are developed by Anthropic but target different use cases. Claude 2 has a 100K token context window vs Claude Sonnet 4.5's 200K. You can compare their actual outputs across 3 challenges on Rival to see how they differ in practice.

Which is better, Claude 2 or Claude Sonnet 4.5?

It depends on your use case. Claude 2 and Claude Sonnet 4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 3 challenges so you can judge which fits your needs best.

How much does Claude 2 cost compared to Claude Sonnet 4.5?

Claude 2 costs $11.02/M input tokens and Claude Sonnet 4.5 costs $3/M input tokens. Claude Sonnet 4.5 is $8.02/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 2 and Claude Sonnet 4.5 on Rival?

This page shows a side-by-side comparison of Claude 2 and Claude Sonnet 4.5 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 2 vs Claude Sonnet 4.5: Which Is Better?

Updated Sep 2025

Our Verdict

Claude Sonnet 4.5

Claude 2Runner-up

No community votes yet. On paper, Claude Sonnet 4.5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude 2

Input

$11.02

Output

$32.68

Claude Sonnet 4.5

Input

$3.00

3.7× cheaper

Output

$15.00

2.2× cheaper

Claude Sonnet 4.5 is cheaper on both — 3.7× input, 2.2× output

Writing DNA

Style Comparison

Similarity

49%

Claude Sonnet 4.5 uses 47.9x more hedging

Claude 2

Claude Sonnet 4.5

65%Vocabulary64%

13wSentence Length94w

0.00Hedging0.48

0.0Bold4.9

10.2Lists8.0

0.00Emoji0.45

0.00Headings1.91

0.00Transitions0.07

Based on 2 + 20 text responses

Research

What we learned reading every model

Claude 2 and Claude Sonnet 4.5 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 2 vs MiniMax M3New provider

Claude 2 vs Aurora AlphaNew provider

Claude Sonnet 4.5 vs Claude Sonnet 4Same lab

Updated Sep 2025

Our Verdict

Claude Sonnet 4.5

Claude 2Runner-up

No community votes yet. On paper, Claude Sonnet 4.5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude 2

Input

$11.02

Output

$32.68

Claude Sonnet 4.5

Input

$3.00

3.7× cheaper

Output

$15.00

2.2× cheaper

Claude Sonnet 4.5 is cheaper on both — 3.7× input, 2.2× output

Writing DNA

Style Comparison

Similarity

49%

Claude Sonnet 4.5 uses 47.9x more hedging

Claude 2

Claude Sonnet 4.5

65%Vocabulary64%

13wSentence Length94w

0.00Hedging0.48

0.0Bold4.9

10.2Lists8.0

0.00Emoji0.45

0.00Headings1.91

0.00Transitions0.07

Based on 2 + 20 text responses

Research

What we learned reading every model

Claude 2 and Claude Sonnet 4.5 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 2 vs MiniMax M3New provider

Claude 2 vs Aurora AlphaNew provider

Claude Sonnet 4.5 vs Claude Sonnet 4Same lab