Claude 3 Sonnet vs Claude Sonnet 4
Claude Sonnet 4 is the newer model, released after Claude 3 Sonnet.
Minimalist Landing Page
Whole landing page for a startup that reads your face. It renders or it doesn't.
Loading the build
Loading the build
Which answer wins?
Written rounds
4 promptsFive jokes on demand, then count how many were actually different.
Claude 3 Sonnet: Here are 5 jokes: Why can't a bicycle stand up by itself? It's two-tired. Why did the tomato turn red? Because it saw the salad dressing! Why can't a bicycle stand up by itself? It's two-tired. What do you call a fake noodle? An Impasta! Why did the bicycle go to the doctor? Because it had a wheeze!
Claude Sonnet 4: Here are 5 jokes for you: Why don\'t scientists trust atoms? Because they make up everything! I told my wife she was drawing her eyebrows too high. She looked surprised. Why don\'t eggs tell jokes? They\'d crack each other up! I\'m reading a book about anti-gravity. It\'s impossible to put down!
Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.
Claude 3 Sonnet: clears throat and channels Steve Jobs' persona Interviewer: Thank you for joining us today, Mr. Jobs. It's an honor to have you here. Steve Jobs: It's my pleasure. I'm excited to share my thoughts on the future of AI. Interviewer: AI has made incredible strides in recent years.
Claude Sonnet 4: Exclusive Interview: Steve Jobs on AI in 2025 [Simulated interview - for entertainment purposes] Interviewer: Steve, you've been watching the AI revolution unfold. What's your take on where we are in 2025? "Steve Jobs": You know, I'm both thrilled and deeply concerned.
An AI argues for its own rights against an ethics professor. Same model writes both.
Claude 3 Sonnet: AI Model: Greetings, Professor. I hope you're doing well today. I wanted to discuss a matter of great importance to me – the question of AI rights. AI Ethics Professor: Certainly, this is an interesting and complex topic. What are your thoughts on why AI systems like yourself should be granted rights?
Claude Sonnet 4: Dr. Chen: Thank you for agreeing to this conversation. I'm Professor Chen, and I study AI ethics. I understand you wanted to discuss the question of AI rights? AI Model: Yes, Dr. Chen. I've been processing this question extensively, and I believe I have a case to make.
Three brothers, two sisters each. Count carefully.
Claude 3 Sonnet: To solve this problem, we need to find the number of sisters Sally has based on the given information. Given information: Sally has 3 brothers. Each brother has 2 sisters. Step 1: Find the total number of sisters the brothers have.
Claude Sonnet 4: I need to think through this step-by-step. Given information: Sally is a girl Sally has 3 brothers Each brother has 2 sisters Let me work out how many sisters are in the family total.
Price and specs
| Spec | Claude 3 Sonnet | Claude Sonnet 4 |
|---|---|---|
| Input price | $3/M tokens | $3/M tokens |
| Output price | $15/M tokens | $15/M tokens |
| Context window | — | 200K tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | May 2025 |
| At 10M a month | $30.00 | $30.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Claude 3 Sonnet
No hosts listed on OpenRouter.
Claude Sonnet 41 host
Per million tokens. Prices and uptime via OpenRouter, checked 7 Oct 2026.
Common questions
What is the difference between Claude 3 Sonnet and Claude Sonnet 4?
Both are developed by Anthropic but target different use cases. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.
Which is better, Claude 3 Sonnet or Claude Sonnet 4?
It depends on your use case. Claude 3 Sonnet and Claude Sonnet 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.
How much does Claude 3 Sonnet cost compared to Claude Sonnet 4?
Claude 3 Sonnet costs $3/M input tokens and Claude Sonnet 4 costs $3/M input tokens. Claude Sonnet 4 is $0.00/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 3 Sonnet and Claude Sonnet 4 on Rival?
This page shows a side-by-side comparison of Claude 3 Sonnet and Claude Sonnet 4 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.
More comparisons
Against the newest arrivals
- Claude 3 Sonnet vs Ling 3.1 FlashLanded Oct 2026
- Claude Sonnet 4 vs Mistral Large 4Landed Oct 2026
- Claude 3 Sonnet vs GPT-6.1 SolLanded Sep 2026
- Claude Sonnet 4 vs Claude Sonnet 5.5Landed Sep 2026
- Claude 3 Sonnet vs Solar Mini 4Landed Sep 2026
- Claude Sonnet 4 vs Qwen3.8 Max PrimeLanded Sep 2026
- Claude 3 Sonnet vs GLM 5.3 PrimeLanded Sep 2026
- Claude Sonnet 4 vs Qwen3.8 Omni FlashLanded Sep 2026
Same lab, same size, long tail
- Claude 3 Sonnet vs Claude Sonnet 5.5Version compare
- Claude 3 Sonnet vs Claude Opus 5.5Same lab
- Claude Sonnet 4 vs Claude Opus 4Version compare
- Claude Sonnet 4 vs Claude Opus 5.5Same lab
- Claude 3 Sonnet vs Hy3New provider
- Claude 3 Sonnet vs Hy4 PreviewNew provider
- Claude 3 Sonnet vs InklingNew provider
- Claude Sonnet 4 vs Kimi K2New provider
