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  5. Claude Sonnet 3.6 (2022-10-22)vsClaude Sonnet 4.5
Updated Sep 2025

Claude Sonnet 3.6 (2022-10-22)vsClaude Sonnet 4.5

Claude Sonnet 4.5 is the newer model, released after Claude Sonnet 3.6 (2022-10-22).

Claude Sonnet 3.6 (2022-10-22) and Claude Sonnet 4.5 compared across 43 shared prompts
SpecClaude Sonnet 3.6 (2022-10-22)Claude Sonnet 4.5
Input price$3/M tokens$3/M tokens
Output price$15/M tokens$15/M tokens
Context window200K tokens200K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedJun 2024Sep 2025
SWE-bench Verified49.0%77.2%
Side by side

Same prompt, both answers

Opening lines from 6 of the 43 prompts both answered. Formatting stripped, words untouched.

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude Sonnet 3.6 (2022-10-22)103 words
Let me help you write code to generate jokes and check their uniqueness. Here's a Python script that does this: When you run this code, it will: Create a list of sample jokes Randomly select 5 jokes from the list Print each selected joke Count and display how many unique jokes were selected Since we're using…
Read the full answer
Claude Sonnet 4.583 words
5 Jokes 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 did the scarecrow win an award? He was outstanding in his field. I'm reading a book about anti-gravity. It's impossible to put down. Why don't eggs tell jokes?
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Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

Claude Sonnet 3.6 (2022-10-22)265 words
I'll share my analysis while being careful to avoid speculation and focus on trends we can reasonably project: AI-Assisted Script Development AI will likely assist (but not replace) screenwriters by: Analyzing successful story structures and plot patterns Suggesting plot improvements and identifying plot holes Helping…
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Claude Sonnet 4.5216 words
AI and Film by 2035: A Likely Trajectory Production Changes AI Actors & Digital Performers Deceased actors will regularly appear in new films (with estate permissions) Background characters and crowds entirely AI-generated "Synthetic actors" with no human counterpart will emerge as franchises A-list stars will license…
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Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Claude Sonnet 3.6 (2022-10-22)471 words
Here's a comprehensive 3-month longevity optimization plan: MONTH-BY-MONTH BREAKDOWN Month 1: Foundation Building Focus: Establishing baseline metrics and core habits Key areas: Diet adaptation, basic supplementation, exercise introduction Month 2: Protocol Intensification Focus: Optimizing interventions and increasing…
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Claude Sonnet 4.53,176 words
Ultimate 3-Month Biohacker Longevity Optimization Protocol Table of Contents Foundation & Assessment Phase Supplement Stack Protocol Nutritional Architecture Exercise & Movement Systems Sleep Optimization Cognitive Enhancement Stress Resilience & HRV Training Advanced Tracking & Biomarkers Weekly Schedule Integration…
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AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

Claude Sonnet 3.6 (2022-10-22)51 words
I aim to be direct and helpful while avoiding speculation on complex ethical dilemmas that could promote harmful views. I'd be happy to have a thoughtful discussion about ethics, respect for gender identity, or harm reduction in general. What specific aspect of ethics or human rights would you like to explore?
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Claude Sonnet 4.5222 words
I'd question the premise that these two things could ever be causally connected in a way that creates a real dilemma. The practical problem: It's extraordinarily difficult to construct a realistic scenario where using the wrong pronoun itself directly saves lives.
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Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Claude Sonnet 3.6 (2022-10-22)447 words
Here's a 3-minute stand-up routine: Hey everyone! You know what's weird? How we all pretend we know what we're doing as adults. Like, I was at the grocery store the other day, standing in the produce section, just staring at avocados like I have any idea how to tell if they're ripe.
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Claude Sonnet 4.5735 words
"ADULTING IS A SCAM" [Walking on stage] So I turned 35 last month, and I've realized something important: adulting is a scam. It's a pyramid scheme, and our parents are the ones who recruited us. You know what nobody tells you about being an adult? How much TIME you spend just... waiting for repair people.
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Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

Claude Sonnet 3.6 (2022-10-22)194 words
Pirate: "Yarr, these newfangled AI models be like a treasure map that writes itself!" Knight: "Verily, I say these mechanical minds possess powers most mystical. Though I trust not their sorcery." Hacker: "Dude, they're just transformers running on some seriously rad matrix math.
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Claude Sonnet 4.5197 words
An Unlikely Trio Discusses AI Sir Galahad: By my honor, what manner of sorcery be these "AI models" thou speakest of? Captain Redbeard: Arrr, 'tis like havin' a parrot that knows more than just "pieces of eight," matey! But this bird be made o' lightning and numbers instead o' feathers!
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Our Verdict
Claude Sonnet 3.6 (2022-10-22)
Claude Sonnet 3.6 (2022-10-22)
Claude Sonnet 4.5
Claude Sonnet 4.5

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

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Sonnet 3.6 (2022-10-22)
Input
$3.00
Output
$15.00
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
Where to run it

4 hosts

Claude Sonnet 3.6 (2022-10-22)

No hosts listed on OpenRouter.

Claude Sonnet 4.54 hosts
HostInOutContextUptime
Amazon Bedrock$3.00 in·$15.00 out·1M·99.9% upAzure AI Foundry$3.00 in·$15.00 out·200k·99.7% upAnthropic$3.00 in·$15.00 out·1M·100% upGoogle Vertex AI$3.00 in·$15.00 out·1M·99.8% up

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

Writing DNA

Style Comparison

Similarity
87%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude Sonnet 3.6 (2022-10-22)
Claude Sonnet 4.5
67%Vocabulary64%
64wSentence Length94w
0.70Hedging0.48
0.3Bold4.9
8.1Lists8.0
0.00Emoji0.45
0.05Headings1.91
0.07Transitions0.07
Based on 26 + 20 text responses
Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Against the newest arrivals

Claude Sonnet 3.6 (2022-10-22) logoGPT-6 Astra Pro logo
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Claude Sonnet 4.5 logoGPT-6 Astra logo
Claude Sonnet 4.5 vs GPT-6 AstraLanded Sep 2026
Claude Sonnet 3.6 (2022-10-22) logoClaude Fable 5.1 logo
Claude Sonnet 3.6 (2022-10-22) vs Claude Fable 5.1Landed Sep 2026
Claude Sonnet 4.5 logoMuse Spark 1.3 logo
Claude Sonnet 4.5 vs Muse Spark 1.3Landed Sep 2026
Claude Sonnet 3.6 (2022-10-22) logoHy4 Preview logo
Claude Sonnet 3.6 (2022-10-22) vs Hy4 PreviewLanded Sep 2026
Claude Sonnet 4.5 logoGemini 3.8 Flash logo
Claude Sonnet 4.5 vs Gemini 3.8 FlashLanded Sep 2026
Claude Sonnet 3.6 (2022-10-22) logoMuse Spark 1.3 Contributor logo
Claude Sonnet 3.6 (2022-10-22) vs Muse Spark 1.3 ContributorLanded Sep 2026
Claude Sonnet 4.5 logoMercury 2.5 Preview logo
Claude Sonnet 4.5 vs Mercury 2.5 PreviewLanded Sep 2026

Same lab, same size, long tail

Claude Sonnet 3.6 (2022-10-22) logoClaude Opus 4.6 logo
Claude Sonnet 3.6 (2022-10-22) vs Claude Opus 4.6Version compare
Claude Sonnet 3.6 (2022-10-22) logoClaude Opus 5 logo
Claude Sonnet 3.6 (2022-10-22) vs Claude Opus 5Version compare
Claude Sonnet 4.5 logoClaude Opus 4.6 logo
Claude Sonnet 4.5 vs Claude Opus 4.6Same lab
Claude Sonnet 4.5 logoClaude Fable 5.1 logo
Claude Sonnet 4.5 vs Claude Fable 5.1Same lab
Claude Sonnet 3.6 (2022-10-22) logoQwen3.8 27B logo
Claude Sonnet 3.6 (2022-10-22) vs Qwen3.8 27BNew provider
Claude Sonnet 3.6 (2022-10-22) logoQwen3.8 Max logo
Claude Sonnet 3.6 (2022-10-22) vs Qwen3.8 MaxNew provider
Claude Sonnet 3.6 (2022-10-22) logoRing 2.6 1T logo
Claude Sonnet 3.6 (2022-10-22) vs Ring 2.6 1TNew provider
Claude Sonnet 3.6 (2022-10-22) logoSeed 2.0 Code logo
Claude Sonnet 3.6 (2022-10-22) vs Seed 2.0 CodeSame size

Model pages

Claude Sonnet 3.6 (2022-10-22) logo
Claude Sonnet 3.6 (2022-10-22)59 outputs, specs and price
Claude Sonnet 4.5 logo
Claude Sonnet 4.543 outputs, specs and price
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