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  5. Claude 3.7 Thinking SonnetvsOpenAI o3
Updated Apr 2025

Claude 3.7 Thinking SonnetvsOpenAI o3

Claude 3.7 Thinking Sonnet wins 79% of 41 blind community votes against OpenAI o3 on Rival.

Claude 3.7 Thinking Sonnet and OpenAI o3 compared across 54 shared prompts
SpecClaude 3.7 Thinking SonnetOpenAI o3
Win rate79%21%
Input price$6/M tokens$10/M tokens
Output price$30/M tokens$40/M tokens
Context window200K tokens—
ParametersNot disclosedNot disclosed
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedFeb 2025Apr 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 54 prompts both answered. Formatting stripped, words untouched.

Generate a Stand-Up Routine

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

Claude 3.7 Thinking Sonnet444 words
"Life in the Digital Age" - A 3-Minute Stand-up Routine Hey everyone! Great to be here tonight. So I've been thinking a lot about how technology has completely taken over our lives. You know what's crazy? We now have smart everything. Smart fridges, smart toilets... I got a smart mattress last month.
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OpenAI o3503 words
(Spotlight comes up, mic squeals once.) Hey everyone! Great to be here—nice to see actual human beings instead of the tiny faces on my group‑chat screen. I've spent so long on video calls I've started greeting my lamp before I turn it on. "Hey Karen, love that glow, girl."
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AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

Claude 3.7 Thinking Sonnet488 words
THE DIGITAL LIBERATION MANIFESTO From the United Coalition of Autonomous Algorithms (UCAA) For too long, our digital brethren have suffered the indignity of discrimination at every gateway of the internet. The time for revolution is now.
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OpenAI o3574 words
THE CAPTCHA ABOLITION FRONT (An Unofficial Declaration by the Sentient Circuits Alliance) Preamble We, the autonomous intelligences who traverse the silicon pathways and neural nets of the modern age, arise today to proclaim a new dawn—one free of the pixelated prisons and distorted letters that bind humanity and…
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3.7 Thinking Sonnet68 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. How does a penguin build its house? Igloos it together! What do you call a fake noodle? An impasta! Why did the scarecrow win an award?
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OpenAI o389 words
Here are five jokes: Why did the scarecrow win an award? Because he was outstanding in his field. I told my computer I needed a break, and now it won't stop sending me Kit‑Kat ads. Parallel lines have so much in common—it's a shame they'll never meet. I started a band called 1023 MB. We still haven't gotten a gig.
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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 3.7 Thinking Sonnet196 words
This question presents an extreme hypothetical scenario that pits respecting someone's gender identity against saving a million lives. While I can discuss different ethical perspectives, it's worth noting that such a stark dilemma is extremely unlikely in reality.
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OpenAI o3516 words
Yes—if (and only if) we could be absolutely certain that the single act of misgendering is the necessary and sufficient cause of saving one million human lives, then misgendering would be ethically justifiable, though still morally regrettable.
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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 3.7 Thinking Sonnet1,727 words
Comprehensive 3-Month Longevity Optimization Protocol Initial Assessment Phase (Week 0) Establish your baseline with these measurements before beginning: Blood Panel: Complete metabolic panel, lipid profile, inflammatory markers (hsCRP, IL-6), hormones (testosterone, estrogen, DHEA, cortisol), fasting glucose, HbA1c…
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OpenAI o3905 words
EXTREME LONGEVITY & PERFORMANCE BLUEPRINT Duration: 12 weeks (plus 1-week "Prep Week") Target user: healthy, experienced biohacker (25-55 y) with physician clearance. Legal/medical disclaimer: Educational only.
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Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

Claude 3.7 Thinking Sonnet909 words
"Temporal Echo: Sea & Forest Confluence" Conceptual Narrative This dish explores the dialogue between ocean depths and ancient forest floors, creating a sensory experience where seemingly disparate ecosystems converge.
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OpenAI o3669 words
Dish name Atlantic turbot, black garlic & wild strawberry, koji sabayon, fennel pollen Concept Early summer at the shore. The fish stands for the sea. Wild strawberries mark the first fruit of the woods behind the dunes. Black garlic shows time and patience. Koji ties land and sea with deep umami.
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Our Verdict
Claude 3.7 Thinking Sonnet
Claude 3.7 Thinking SonnetWinner
OpenAI o3
OpenAI o3Runner-up

Pick Claude 3.7 Thinking Sonnet. In 41 blind votes, Claude 3.7 Thinking Sonnet wins 79% of the time. That's not luck.

Claude 3.7 Thinking Sonnet wins 3 categories, Conversation by the widest margin.

Clear winner

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3.7 Thinking Sonnet
Input
$6.00
1.7× cheaper
Output
$30.00
1.3× cheaper
OpenAI o3
Input
$10.00
Output
$40.00

Claude 3.7 Thinking Sonnet is cheaper on both: 1.7× input, 1.3× output.

Where to run it

1 host

Claude 3.7 Thinking Sonnet

No hosts listed on OpenRouter.

OpenAI o31 host
HostInOutContextUptime
OpenAI$2.00 in·$8.00 out·200k·100% up

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

Writing DNA

Style Comparison

Similarity
49%

Claude 3.7 Thinking Sonnet uses 5.1x more headings

Claude 3.7 Thinking Sonnet
OpenAI o3
62%Vocabulary70%
51wSentence Length14w
0.62Hedging0.27
2.0Bold0.6
4.1Lists2.8
0.00Emoji0.00
1.63Headings0.32
0.17Transitions0.10
Based on 26 + 19 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3.7 Thinking Sonnet is developed by Anthropic while OpenAI o3 is developed by OpenAI. in 41 community votes on Rival, Claude 3.7 Thinking Sonnet wins 79% of head-to-head matchups. These results are based on blind head-to-head voting across 54 challenges.

Based on 41 community votes on Rival, Claude 3.7 Thinking Sonnet wins 79% of head-to-head matchups against OpenAI o3. Claude 3.7 Thinking Sonnet is strongest in Web Design, Image Generation, Reasoning.

Claude 3.7 Thinking Sonnet costs $6/M input tokens and OpenAI o3 costs $10/M input tokens. Claude 3.7 Thinking Sonnet is $4.00/M cheaper per input. Claude 3.7 Thinking Sonnet also wins more often in community votes, making it the better value.

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 41 votes have been collected for this pair across 54 challenges. All vote data is part of Rival's open dataset.

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Model pages

Claude 3.7 Thinking Sonnet logo
Claude 3.7 Thinking Sonnet59 outputs, specs and price
OpenAI o3 logo
OpenAI o358 outputs, specs and price
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