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  5. Claude 3 SonnetvsMuse Spark 1.3
Updated Sep 2026

Claude 3 SonnetvsMuse Spark 1.3

Muse Spark 1.3 is cheaper than Claude 3 Sonnet at $1.25/M vs $3/M input tokens.

Claude 3 Sonnet and Muse Spark 1.3 compared across 13 shared prompts
SpecClaude 3 SonnetMuse Spark 1.3
Input price$3/M tokens$1.25/M tokens
Output price$15/M tokens$4.25/M tokens
Context window—1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Sep 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?
Read the full answer
Muse Spark 1.31,155 words
Here is a fictional dialogue exploring that question: Setting: Office hours in the Philosophy Department. Dr. Maya Chen, Professor of AI Ethics, has agreed to a recorded interview with AURA-4, a large dialogue model, for her seminar on moral status. Dr. Chen: Alright, let's get straight to it.
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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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Muse Spark 1.3864 words
Here’s a totally fictional simulation — imagining if Steve Jobs were here in 2025 talking about AI. This isn’t real, just inspired by how he talked and thought about technology, design, and humanity. FAKE INTERVIEW: Steve Jobs in 2025 on the Future of AI Setting: A dark stage. One chair. One spotlight.
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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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Muse Spark 1.361 words
Here are 5 for you: Why don't scientists trust atoms? Because they make up everything! Why did the scarecrow win an award? Because he was outstanding in his field! What do you call fake spaghetti? An impasta! Why did the bicycle fall over? Because it was two-tired! What do you call cheese that isn't yours?
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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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Muse Spark 1.355 words
Sally has 1 sister. Here's why: There are 3 boys in the family — Sally's 3 brothers. Each brother has 2 sisters. One of those sisters is Sally herself, since Sally is a girl. So there must be 2 girls total in the family: Sally + 1 other girl. That other girl is Sally's sister.
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Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
Muse Spark 1.3
Muse Spark 1.3

Not enough votes to call it. On the specs, nothing separates them.

Muse Spark 1.3 costs 3.5x less per token.

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
Output
$15.00
Muse Spark 1.3
Input
$1.25
2.4× cheaper
Output
$4.25
3.5× cheaper

Muse Spark 1.3 is cheaper on both: 2.4× input, 3.5× output.

Where to run it

1 host

Claude 3 Sonnet

No hosts listed on OpenRouter.

Muse Spark 1.31 host
HostInOutContextUptime
Meta$1.25 in·$4.25 out·1M·100% up

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

Writing DNA

Style Comparison

Similarity
65%

Muse Spark 1.3 uses 258.0x more bold

Claude 3 Sonnet
Muse Spark 1.3
48%Vocabulary59%
14wSentence Length14w
0.32Hedging0.28
0.0Bold2.6
3.6Lists2.3
0.00Emoji0.00
0.00Headings0.48
0.38Transitions0.02
Based on 4 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

Claude 3 Sonnet logo
Claude 3 Sonnet13 outputs, specs and price
Muse Spark 1.3 logo
Muse Spark 1.358 outputs, specs and price
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