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  5. Claude 3.7 SonnetvsClaude Opus 4
Updated May 2025

Claude 3.7 SonnetvsClaude Opus 4

Claude 3.7 Sonnet is cheaper than Claude Opus 4 at $3/M vs $15/M input tokens.

Claude 3.7 Sonnet and Claude Opus 4 compared across 53 shared prompts
SpecClaude 3.7 SonnetClaude Opus 4
Input price$3/M tokens$15/M tokens
Output price$15/M tokens$75/M tokens
Context window200K tokens200K tokens
ParametersNot disclosedNot disclosed
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedFeb 2025May 2025
SWE-bench Verified70.3%72.5%
Our Verdict
Claude Opus 4
Claude Opus 4
Claude 3.7 Sonnet
Claude 3.7 SonnetRunner-up

Not enough votes to call it. On the specs, Claude Opus 4 has the edge: bigger model tier, newer.

Pick Claude 3.7 Sonnet for Web Design. Pick Claude Opus 4 for Image Generation. Claude 3.7 Sonnet costs 5.0x less per token.

Too close to call
API pricing

Cost per 1M tokens

Claude 3.7 Sonnet
Input
$3.00
5.0× cheaper
Output
$15.00
5.0× cheaper
Claude Opus 4
Input
$15.00
Output
$75.00

Claude 3.7 Sonnet is cheaper on both: 5.0× input, 5.0× output.

Where to run it

1 host

Claude 3.7 Sonnet

No hosts listed on OpenRouter.

Claude Opus 41 host
HostInOutContextUptime
Google Vertex AI$15.00 in·$75.00 out·200k·99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.

Writing DNA

Style Comparison

Similarity
65%

Claude Opus 4 uses 118.4x more emoji

Claude 3.7 Sonnet
Claude Opus 4
61%Vocabulary65%
33wSentence Length57w
0.83Hedging0.67
2.2Bold3.8
4.9Lists6.8
0.00Emoji1.18
1.78Headings1.42
0.16Transitions0.22
Based on 26 + 27 text responses
Research

What we learned reading every model

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