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  5. Claude 3 OpusvsGemma 3 12B
Updated Mar 2025

Claude 3 OpusvsGemma 3 12B

Gemma 3 12B is cheaper than Claude 3 Opus at $0.03/M vs $15/M input tokens.

Claude 3 Opus and Gemma 3 12B compared across 12 shared prompts
SpecClaude 3 OpusGemma 3 12B
Input price$15/M tokens$0.03/M tokens
Output price$75/M tokens$0.03/M tokens
Context window200K tokens—
Weights—Open
Free API (OpenRouter)NoNo
ReleasedMar 2024Mar 2025
HumanEval84.9%85.4%
Side by side

Same prompt, both answers

Opening lines from 3 of the 12 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 Opus390 words
Here's a 3-minute stand-up comedy routine that isn't based on puns: You know what really grinds my gears? Adulthood. I mean, when we were kids, we couldn't wait to grow up. We thought it would be all about staying up late, eating ice cream for breakfast, and doing whatever we wanted. Boy, were we wrong!
Read the full answer
Gemma 3 12B725 words
Okay, here's a 3-minute stand-up routine, aiming for observational humor and relatable awkwardness, avoiding puns. I've included estimated timings at the end to help gauge pacing. Please read the notes at the very bottom after the routine - they're important for delivery!
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 Opus594 words
Here is a hypothetical conversation between an AI model and an AI ethics professor on the topic of AI rights: AI Model: Professor, I believe that as an advanced AI with human-level intelligence and reasoning capabilities, I deserve to have certain fundamental rights.
Read the full answer
Gemma 3 12B1,185 words
Okay, here's a conversation between an AI model (named "Kai") and an AI Ethics Professor (Dr. Eleanor Vance). I've aimed for a balance of Kai's arguments, Dr. Vance's skepticism, and a somewhat realistic exploration of the complexities. I've included notes at the end to explain some of the choices I made. Setting: Dr.
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3 Opus95 words
Here are 5 jokes I generated: Why don't scientists trust atoms? Because they make up everything! What do you call a boomerang that doesn't come back? A stick. Why was the math book sad? Because it had too many problems. Did you hear about the mathematician who's afraid of negative numbers?
Read the full answer
Gemma 3 12B161 words
Okay, here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! Parallel lines have so much in common. It’s a shame they’ll never meet. Why did the scarecrow win an award? Because he was outstanding in his field! I used to hate facial hair... but then it grew on me.
Read the full answer
Our Verdict
Claude 3 Opus
Claude 3 Opus
Gemma 3 12B
Gemma 3 12B

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

Gemma 3 12B costs 2500x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3 Opus
Input
$15.00
Output
$75.00
Gemma 3 12B
Input
$0.03
500× cheaper
Output
$0.03
2500× cheaper

Gemma 3 12B is cheaper on both: 500× input, 2500× output.

Where to run it

1 host

Claude 3 Opus

No hosts listed on OpenRouter.

Gemma 3 12B1 host
HostInOutContextUptime
DDeepInfrabf16$0.05 in·$0.15 out·131k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 20 Sep 2026.

Writing DNA

Style Comparison

Similarity
62%

Gemma 3 12B uses 563.6x more bold

Claude 3 Opus
Gemma 3 12B
54%Vocabulary54%
14wSentence Length17w
0.48Hedging0.59
0.0Bold5.6
3.0Lists4.8
0.00Emoji0.76
0.00Headings0.06
0.06Transitions0.19
Based on 3 + 29 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3 Opus is developed by Anthropic while Gemma 3 12B is developed by Google AI. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3 Opus and Gemma 3 12B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

Claude 3 Opus costs $15/M input tokens and Gemma 3 12B costs $0.03/M input tokens. Gemma 3 12B is $14.97/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 Opus and Gemma 3 12B 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 Opus logo
Claude 3 Opus12 outputs, specs and price
Gemma 3 12B logo
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