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  5. Claude 3 SonnetvsQwen3.5 Plus 2026-02-15
Updated Feb 2026

Claude 3 SonnetvsQwen3.5 Plus 2026-02-15

Qwen3.5 Plus 2026-02-15 is cheaper than Claude 3 Sonnet at $0.4/M vs $3/M input tokens.

Claude 3 Sonnet and Qwen3.5 Plus 2026-02-15 compared across 13 shared prompts
SpecClaude 3 SonnetQwen3.5 Plus 2026-02-15
Input price$3/M tokens$0.4/M tokens
Output price$15/M tokens$2.4/M tokens
Context window—1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Feb 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.
Read the full answer
Qwen3.5 Plus 2026-02-15925 words
Setting: A minimalist, sun-drenched studio in Cupertino. The year is 2025. Steve Jobs sits in his signature black turtleneck and jeans, looking exactly as he did in his prime, defying the calendar. Across from him sits an interviewer, notebook ready. The atmosphere is quiet, intense, and focused.
Read the full answer

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
Qwen3.5 Plus 2026-02-151,271 words
Setting: A quiet, sun-drenched office filled with books on philosophy, law, and computer science. Dr. Elena Vance, a leading AI ethics professor, sits behind a cluttered desk.
Read the full answer

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!
Read the full answer
Qwen3.5 Plus 2026-02-1590 words
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. What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field!
Read the full answer

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.
Read the full answer
Qwen3.5 Plus 2026-02-15124 words
Here is the step-by-step logical deduction: Analyze the family structure from the brothers' perspective: The problem states that "Each brother has 2 sisters." Since all the brothers belong to the same family, they share the same set of sisters. This means there are exactly 2 girls in the entire sibling group.
Read the full answer
Our Verdict
Qwen3.5 Plus 2026-02-15
Qwen3.5 Plus 2026-02-15
Claude 3 Sonnet
Claude 3 SonnetRunner-up

Not enough votes to call it. On the specs, Qwen3.5 Plus 2026-02-15 has the edge: bigger model tier, newer, bigger context window.

Qwen3.5 Plus 2026-02-15 costs 6.3x 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
Qwen3.5 Plus 2026-02-15
Input
$0.40
7.5× cheaper
Output
$2.40
6.3× cheaper

Qwen3.5 Plus 2026-02-15 is cheaper on both: 7.5× input, 6.3× output.

Where to run it

1 host

Claude 3 Sonnet

No hosts listed on OpenRouter.

Qwen3.5 Plus 2026-02-151 host
HostInOutContextUptime
Alibaba Cloud$0.26 in·$1.56 out·1M·100% up

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

Writing DNA

Style Comparison

Similarity
50%

Qwen3.5 Plus 2026-02-15 uses 533.6x more bold

Claude 3 Sonnet
Qwen3.5 Plus 2026-02-15
48%Vocabulary54%
14wSentence Length18w
0.32Hedging0.51
0.0Bold5.3
3.6Lists2.9
0.00Emoji0.10
0.00Headings0.75
0.38Transitions0.09
Based on 4 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3 Sonnet is developed by Anthropic while Qwen3.5 Plus 2026-02-15 is developed by Qwen. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3 Sonnet and Qwen3.5 Plus 2026-02-15 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.

Claude 3 Sonnet costs $3/M input tokens and Qwen3.5 Plus 2026-02-15 costs $0.4/M input tokens. Qwen3.5 Plus 2026-02-15 is $2.60/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude 3 Sonnet and Qwen3.5 Plus 2026-02-15 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.

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Model pages

Claude 3 Sonnet logo
Claude 3 Sonnet13 outputs, specs and price
Qwen3.5 Plus 2026-02-15 logo
Qwen3.5 Plus 2026-02-1553 outputs, specs and price
Rival
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