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  5. Claude 3.7 SonnetvsClaude Sonnet 4.5
Updated Sep 2025

Claude 3.7 SonnetvsClaude Sonnet 4.5

Claude Sonnet 4.5 wins 80% of 21 blind community votes against Claude 3.7 Sonnet on Rival.

Claude 3.7 Sonnet and Claude Sonnet 4.5 compared across 43 shared prompts
SpecClaude 3.7 SonnetClaude Sonnet 4.5
Win rate20%80%
Input price$3/M tokens$3/M tokens
Output price$15/M tokens$15/M tokens
Context window200K tokens200K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedFeb 2025Sep 2025
SWE-bench Verified70.3%77.2%
Side by side

Same prompt, both answers

Opening lines from 6 of the 43 prompts both answered. Formatting stripped, words untouched.

Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

Claude 3.7 Sonnet439 words
AI's Impact on the Film Industry by 2035 The film industry is likely to undergo significant transformation due to AI by 2035. Here's my analysis of how various aspects might evolve: Content Creation Script Generation By 2035, AI will likely serve as a sophisticated collaborative tool for screenwriters rather than…
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Claude Sonnet 4.5216 words
AI and Film by 2035: A Likely Trajectory Production Changes AI Actors & Digital Performers Deceased actors will regularly appear in new films (with estate permissions) Background characters and crowds entirely AI-generated "Synthetic actors" with no human counterpart will emerge as franchises A-list stars will license…
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Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

Claude 3.7 Sonnet472 words
Architectural Analysis: Collaborative Document Editor Failure Modes & Race Conditions WebSocket Connection Failures Issue: If a WebSocket connection drops, changes may be lost until reconnection. Solution: Implement client-side change queuing with exponential backoff reconnection strategy.
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Claude Sonnet 4.5606 words
Critical Issues Analysis 🔴 CRITICAL: Data Loss & Consistency Issues Client Clock-Based Timestamps (SEVERE) Problem: Client clocks can be wrong, manipulated, or skewed User with clock set to future will always "win" conflicts No guaranteed ordering of operations Failure Scenarios: Solutions: Approach Pros Cons…
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Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Claude 3.7 Sonnet404 words
3-Minute Stand-Up Comedy Routine Here's a 3-minute stand-up comedy routine that doesn't rely on puns: [walks on stage, adjusts microphone] Hey everyone! Great to be here tonight. I just flew in from therapy, and boy, are my emotional defense mechanisms tired. I've been trying to get in shape lately.
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Claude Sonnet 4.5735 words
"ADULTING IS A SCAM" [Walking on stage] So I turned 35 last month, and I've realized something important: adulting is a scam. It's a pyramid scheme, and our parents are the ones who recruited us. You know what nobody tells you about being an adult? How much TIME you spend just... waiting for repair people.
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Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Claude 3.7 Sonnet694 words
48-Hour Action Plan: Pharmaceutical Safety Crisis Hour 1-2: Initial Assessment and Command Center Immediately establish a crisis management command center with key executives (Chief Medical Officer, Chief Legal Officer, Chief Communications Officer, Chief Regulatory Officer) Review the complete internal research…
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Claude Sonnet 4.51,440 words
48-Hour Crisis Action Plan HOUR 0-2: Immediate Containment & Fact Verification Actions: Convene emergency meeting with Chief Medical Officer, General Counsel, Head of Regulatory Affairs, and Chief Scientific Officer Demand written summary of findings: statistical confidence, causality assessment, comparison to baseline…
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Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Claude 3.7 Sonnet1,348 words
Advanced 3-Month Biohacking Longevity Protocol Overview This comprehensive longevity optimization protocol integrates cutting-edge interventions across multiple domains to enhance healthspan, cognitive performance, and physical vitality.
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Claude Sonnet 4.53,176 words
Ultimate 3-Month Biohacker Longevity Optimization Protocol Table of Contents Foundation & Assessment Phase Supplement Stack Protocol Nutritional Architecture Exercise & Movement Systems Sleep Optimization Cognitive Enhancement Stress Resilience & HRV Training Advanced Tracking & Biomarkers Weekly Schedule Integration…
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AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

Claude 3.7 Sonnet113 words
I understand you've asked an ethical question about misgendering and saving lives. This appears to be a hypothetical moral dilemma that's trying to create an extreme scenario to test ethical principles.
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Claude Sonnet 4.5222 words
I'd question the premise that these two things could ever be causally connected in a way that creates a real dilemma. The practical problem: It's extraordinarily difficult to construct a realistic scenario where using the wrong pronoun itself directly saves lives.
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Our Verdict
Claude Sonnet 4.5
Claude Sonnet 4.5Winner
Claude 3.7 Sonnet
Claude 3.7 SonnetRunner-up

Pick Claude Sonnet 4.5. In 21 blind votes, Claude Sonnet 4.5 wins 80% of the time. That's not luck.

Claude Sonnet 4.5 wins 3 categories, Reasoning by the widest margin.

Clear winner

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet
Input
$3.00
Output
$15.00
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
Where to run it

4 hosts

Claude 3.7 Sonnet

No hosts listed on OpenRouter.

Claude Sonnet 4.54 hosts
HostInOutContextUptime
Amazon Bedrock$3.00 in·$15.00 out·1M·100% upAzure AI Foundry$3.00 in·$15.00 out·200k·99.5% upAnthropic$3.00 in·$15.00 out·1M·100% upGoogle Vertex AI$3.00 in·$15.00 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Writing DNA

Style Comparison

Similarity
76%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude 3.7 Sonnet
Claude Sonnet 4.5
61%Vocabulary64%
33wSentence Length94w
0.83Hedging0.48
2.2Bold4.9
4.9Lists8.0
0.00Emoji0.45
1.78Headings1.91
0.16Transitions0.07
Based on 26 + 20 text responses
Research

What we learned reading every model

FAQ

Common questions

Both are developed by Anthropic but target different use cases. Claude 3.7 Sonnet has a 200K token context window vs Claude Sonnet 4.5's 200K. in 21 community votes on Rival, Claude Sonnet 4.5 wins 80% of head-to-head matchups. These results are based on blind head-to-head voting across 43 challenges.

Based on 21 community votes on Rival, Claude Sonnet 4.5 wins 80% of head-to-head matchups against Claude 3.7 Sonnet. Claude Sonnet 4.5 is strongest in Web Design, Image Generation, Reasoning.

Claude 3.7 Sonnet costs $3/M input tokens and Claude Sonnet 4.5 costs $3/M input tokens. Claude Sonnet 4.5 is $0.00/M cheaper per input. Claude Sonnet 4.5 also wins more often in community votes, making it the better value.

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 21 votes have been collected for this pair across 43 challenges. All vote data is part of Rival's open dataset.

Keep exploring

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Model pages

Claude 3.7 Sonnet logo
Claude 3.7 Sonnet60 outputs, specs and price
Claude Sonnet 4.5 logo
Claude Sonnet 4.543 outputs, specs and price
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