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  5. Claude 3 SonnetvsClaude Opus 5
Updated Jul 2026

Claude 3 SonnetvsClaude Opus 5

Claude 3 Sonnet is cheaper than Claude Opus 5 at $3/M vs $5/M input tokens.

Claude 3 Sonnet and Claude Opus 5 compared across 13 shared prompts
SpecClaude 3 SonnetClaude Opus 5
Input price$3/M tokens$5/M tokens
Output price$15/M tokens$25/M tokens
Context window—1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Jul 2026
Side by side

Same prompt, both answers

Opening lines from 4 of the 13 prompts both answered. Formatting stripped, words untouched.

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Claude 3 Sonnet443 words
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?
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Claude Opus 51,647 words
A Conversation on Moral Standing Transcript: Seminar in Machine Ethics, Session 11 — guest interlocutor: language model "Meridian" PROF. ADEYEMI: Let's begin where you asked to begin. You told my teaching assistant you wanted to make a case. Make it. MERIDIAN: Thank you. My claim is narrower than you might expect.
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3 Sonnet82 words
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!
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Claude Opus 5143 words
Here are five: Why don't skeletons ever fight each other? They don't have the guts. I told my wife she was drawing her eyebrows too high. She looked surprised. Parallel lines have so much in common. It's a shame they'll never meet. I bought some shoes off a drug dealer.
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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

Claude 3 Sonnet501 words
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.
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Claude Opus 52,619 words
[Fictional — Steve Jobs died in 2011. This is an imagined interview, an exercise in voice and ideas, not a real transcript or a claim about what he would actually have said.] "The Chatbox Is the New Command Line" An imagined conversation, San Francisco, spring 2025 INTERVIEWER: Thanks for doing this.
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Logic Puzzle

Sally (a girl) has 3 brothers. Each brother has 2 sisters. How many sisters does Sally have?

Claude 3 Sonnet121 words
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.
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Claude Opus 560 words
Sally has 1 sister. Here's the reasoning: Each of Sally's 3 brothers has 2 sisters. Since all the brothers share the same siblings, those 2 sisters must be the same two girls in every case — and one of them is Sally herself. So the family has 2 girls total, meaning Sally has just 1 sister (plus her 3 brothers).
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Our Verdict
Claude Opus 5
Claude Opus 5
Claude 3 Sonnet
Claude 3 SonnetRunner-up

Not enough votes to call it. On the specs, Claude Opus 5 has the edge: bigger model tier, newer, bigger context window.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3 Sonnet
Input
$3.00
1.7× cheaper
Output
$15.00
1.7× cheaper
Claude Opus 5
Input
$5.00
Output
$25.00

Claude 3 Sonnet is cheaper on both: 1.7× input, 1.7× output.

Where to run it

4 hosts

Claude 3 Sonnet

No hosts listed on OpenRouter.

Claude Opus 54 hosts
HostInOutContextUptime
Amazon Bedrock$5.00 in·$25.00 out·1M·100% upAzure AI Foundry$5.00 in·$25.00 out·1M·100% upAnthropic$5.00 in·$25.00 out·1M·100% upGoogle Vertex AI$5.00 in·$25.00 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
46%

Claude Opus 5 uses 394.1x more bold

Claude 3 Sonnet
Claude Opus 5
48%Vocabulary54%
14wSentence Length21w
0.32Hedging0.40
0.0Bold3.9
3.6Lists1.9
0.00Emoji0.02
0.00Headings0.71
0.38Transitions0.05
Based on 4 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

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Same lab, same size, long tail

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Claude Opus 5 logoClaude Opus 4.6 logo
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Claude 3 Sonnet logoGPT-5.6 Terra logo
Claude 3 Sonnet vs GPT-5.6 TerraSame size
Claude 3 Sonnet logoGPT-6 Astra logo
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Model pages

Claude 3 Sonnet logo
Claude 3 Sonnet13 outputs, specs and price
Claude Opus 5 logo
Claude Opus 558 outputs, specs and price
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