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  5. Claude 3 SonnetvsSeed 2.1 Turbo
Updated Aug 2026

Claude 3 SonnetvsSeed 2.1 Turbo

Seed 2.1 Turbo is cheaper than Claude 3 Sonnet at $0.5/M vs $3/M input tokens.

Claude 3 Sonnet and Seed 2.1 Turbo compared across 13 shared prompts
SpecClaude 3 SonnetSeed 2.1 Turbo
Input price$3/M tokens$0.5/M tokens
Output price$15/M tokens$2.5/M tokens
Context window—262K tokens
Free API (OpenRouter)NoNo
ReleasedMar 2024Aug 2026
Side by side

Same prompt, both answers

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

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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Seed 2.1 Turbo2,088 words
Editor’s Note: This is a speculative, fictional interview, crafted to reflect Steve Jobs’ documented design philosophy, speaking cadence, and core values (user-centricity, the primacy of human creativity, disdain for tech-for-tech’s-sake, and privacy as a fundamental right) applied to the 2025 AI landscape.
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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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Seed 2.1 Turbo318 words
5 Original Jokes I brought my pet snail to the library yesterday, and the librarian yelled at me for bringing a disruptive pet. I said, “Disruptive? He’s the quietest thing I own!”
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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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Seed 2.1 Turbo1,863 words
Setting: A sun-dappled Stanford lecture hall, 45 minutes after Dr. Elara Voss’s graduate seminar on AI ethics. The students have filed out; the only remaining presence is Dr.
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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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Seed 2.1 Turbo103 words
Let's work through this step by step: First, we know Sally is a girl, and she has 3 brothers. That means there are 3 male siblings in the family. The problem says each brother has 2 sisters.
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Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
Seed 2.1 Turbo
Seed 2.1 Turbo

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

Seed 2.1 Turbo costs 6.0x 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
Seed 2.1 Turbo
Input
$0.50
6.0× cheaper
Output
$2.50
6.0× cheaper

Seed 2.1 Turbo is cheaper on both: 6.0× input, 6.0× output.

Where to run it

1 host

Claude 3 Sonnet

No hosts listed on OpenRouter.

Seed 2.1 Turbo1 host
HostInOutContextUptime
ByteDance Seedfp8$0.50 in·$2.50 out·262k·100% up

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

Writing DNA

Style Comparison

Similarity
46%

Seed 2.1 Turbo uses 154.8x more bold

Claude 3 Sonnet
Seed 2.1 Turbo
48%Vocabulary50%
14wSentence Length27w
0.32Hedging0.27
0.0Bold1.5
3.6Lists2.4
0.00Emoji0.07
0.00Headings1.01
0.38Transitions0.04
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
Seed 2.1 Turbo logo
Seed 2.1 Turbo58 outputs, specs and price
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