What is the difference between Claude Sonnet 4.5 and Claude Fable 5?

Both are developed by Anthropic but target different use cases. Claude Sonnet 4.5 has a 200K token context window vs Claude Fable 5'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 Claude Fable 5?

It depends on your use case. Claude Sonnet 4.5 and Claude Fable 5 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 Claude Fable 5?

Claude Sonnet 4.5 costs $3/M input tokens and Claude Fable 5 costs $10/M input tokens. Claude Sonnet 4.5 is $7.00/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 Claude Fable 5 on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4.5 and Claude Fable 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 Sonnet 4.5 and Claude Fable 5?

Both are developed by Anthropic but target different use cases. Claude Sonnet 4.5 has a 200K token context window vs Claude Fable 5'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 Claude Fable 5?

It depends on your use case. Claude Sonnet 4.5 and Claude Fable 5 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 Claude Fable 5?

Claude Sonnet 4.5 costs $3/M input tokens and Claude Fable 5 costs $10/M input tokens. Claude Sonnet 4.5 is $7.00/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 Claude Fable 5 on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4.5 and Claude Fable 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 Sonnet 4.5 vs Claude Fable 5: Which Is Better?

Updated Jun 2026

Our Verdict

Claude Fable 5

Claude Sonnet 4.5Runner-up

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

Claude Sonnet 4.5 is 3.3x cheaper per token — worth considering if cost matters.

Slight edge

API pricing

Cost per 1M tokens

Claude Sonnet 4.5

Input

$3.00

3.3× cheaper

Output

$15.00

3.3× cheaper

Claude Fable 5

Input

$10.00

Output

$50.00

Claude Sonnet 4.5 is cheaper on both — 3.3× input, 3.3× output

Writing DNA

Style Comparison

Similarity

61%

Claude Sonnet 4.5 uses 4.2x more sentence length

Claude Sonnet 4.5

Claude Fable 5

64%Vocabulary60%

94wSentence Length22w

0.48Hedging0.49

4.9Bold4.0

8.0Lists3.5

0.45Emoji0.58

1.91Headings1.09

0.07Transitions0.05

Based on 20 + 27 text responses

Research

What we learned reading every model

Claude Sonnet 4.5 and Claude Fable 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 Sonnet 4.5 vs MiniMax M3New provider

Claude Sonnet 4.5 vs GPT-5New provider

Claude Sonnet 4.5 vs Claude Opus 4.1Same lab

Updated Jun 2026

Our Verdict

Claude Fable 5

Claude Sonnet 4.5Runner-up

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

Claude Sonnet 4.5 is 3.3x cheaper per token — worth considering if cost matters.

Slight edge

API pricing

Cost per 1M tokens

Claude Sonnet 4.5

Input

$3.00

3.3× cheaper

Output

$15.00

3.3× cheaper

Claude Fable 5

Input

$10.00

Output

$50.00

Claude Sonnet 4.5 is cheaper on both — 3.3× input, 3.3× output

Writing DNA

Style Comparison

Similarity

61%

Claude Sonnet 4.5 uses 4.2x more sentence length

Claude Sonnet 4.5

Claude Fable 5

64%Vocabulary60%

94wSentence Length22w

0.48Hedging0.49

4.9Bold4.0

8.0Lists3.5

0.45Emoji0.58

1.91Headings1.09

0.07Transitions0.05

Based on 20 + 27 text responses

Research

What we learned reading every model

Claude Sonnet 4.5 and Claude Fable 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 Sonnet 4.5 vs MiniMax M3New provider

Claude Sonnet 4.5 vs GPT-5New provider

Claude Sonnet 4.5 vs Claude Opus 4.1Same lab