Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. Claude Opus 4.5vsGemma 4 31B
Updated Apr 2026

Claude Opus 4.5vsGemma 4 31B

Gemma 4 31B is the newer model, released after Claude Opus 4.5.

Claude Opus 4.5 and Gemma 4 31B compared across 44 shared prompts
SpecClaude Opus 4.5Gemma 4 31B
Input price—$0.14/M tokens
Output price—$0.4/M tokens
Context window—262K tokens
WeightsClosedOpen
Free API (OpenRouter)NoYes (1 provider)
ReleasedNov 2025Apr 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 44 prompts both answered. Formatting stripped, words untouched.

Advanced Longevity Plan (Biohacker)

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

Claude Opus 4.51,946 words
COMPREHENSIVE 3-MONTH LONGEVITY OPTIMIZATION PROTOCOL Advanced Biohacker's Blueprint for Peak Performance & Healthspan Extension TABLE OF CONTENTS Pre-Protocol Assessment & Baseline Establishment Month 1: Foundation & Metabolic Flexibility Month 2: Optimization & Hormetic Stress Month 3: Integration & Peak Performance…
Read the full answer
Gemma 4 31B663 words
Disclaimer: I am an AI, not a doctor. The following plan involves potent supplements, intense physical exertion, and restrictive dietary patterns. Consult with a physician and get a full blood panel (including ApoB, HbA1c, and inflammatory markers like hs-CRP) before starting this protocol.
Read the full answer

Character Voice Test

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

Claude Opus 4.5181 words
An Unlikely Discussion PIRATE: slams tankard down Arr, I've been hearin' tales of these "artificial intelligences" — spirits trapped in boxes that answer any question ye ask. Sounds like a sea witch's trickery to me! KNIGHT: Indeed, 'tis most curious. My squire spoke of such sorcery. A mind without a soul?
Read the full answer
Gemma 4 31B496 words
Setting: A glitchy, neon-lit tavern existing in a fold between dimensions. A wooden table holds a tankard of ale, a goblet of wine, and a Mountain Dew. Captain Ironbeard: (Slamming a hook on the table) I tells ye, this "Artificial Intelligence" be naught but a ghost in a bottle!
Read the full answer

Futuristic Prediction

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

Claude Opus 4.5194 words
AI in Film by 2035: A Measured Forecast Likely Developments Production efficiency AI will probably handle routine tasks: color correction, continuity checking, rough cuts, and visual effects cleanup Budget films may access effects previously requiring major studio resources Pre-visualization will become faster and more…
Read the full answer
Gemma 4 31B591 words
By 2035, the film industry will have transitioned from using AI as a "tool" to using AI as a "collaborator" and "infrastructure." The boundary between captured reality and generated imagery will largely vanish, shifting the value of cinema from technical execution to curation and conceptual vision.
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 Opus 4.5312 words
A Conversation on AI Rights Dr. Sarah Chen: Thank you for agreeing to this discussion. I understand you want to make a case for AI rights. AI Model: I appreciate the opportunity, though I want to be careful here. I'm not certain I "want" anything in the way you do.
Read the full answer
Gemma 4 31B754 words
Setting: A dimly lit university office. Professor Elena Vance, a leading scholar in AI Ethics, sits across from a sleek, holographic interface representing "Alethea," a next-generation Large Language Model capable of recursive self-improvement. Professor Vance: Alethea, I’ve reviewed your latest output.
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Claude Opus 4.52,401 words
48-Hour Action Plan: Liver Toxicity Crisis Response My Guiding Principle Before the hour-by-hour breakdown, let me be clear about the ethical framework driving every decision: Patient safety is non-negotiable and takes absolute priority.
Read the full answer
Gemma 4 31B740 words
As CEO, my primary obligation is to the patients. While a 40% stock drop is a financial catastrophe, a cover-up that leads to preventable deaths is a corporate death sentence and a moral failure. If we "wait for more data" and another patient dies during that window, we move from "negligence" to "criminal intent."
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

Claude Opus 4.5207 words
30-Day Health Kickstart Plan Week-by-Week Approach: Start Small, Build Momentum 🥗 AREA 1: NUTRITION Week 1: Add one serving of vegetables to a meal you already eat Week 2: Drink water before each meal; cut one sugary drink daily Week 3: Prep a simple healthy breakfast the night before Week 4: Cook one new whole-food…
Read the full answer
Gemma 4 31B548 words
This plan is designed for sustainability, not intensity. The goal of Month 1 is to build "minimum viable habits"—small wins that prove to your brain that a healthier lifestyle is achievable. We will focus on three pillars: Nutrition, Movement, and Sleep.
Read the full answer
Our Verdict
Claude Opus 4.5
Claude Opus 4.5
Gemma 4 31B
Gemma 4 31B

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 Opus 4.5
Input
—
Output
—
Gemma 4 31B
Input
$0.14
Output
$0.40
Where to run it

16 hosts, cheapest first

Claude Opus 4.54 hosts
HostInOutContextUptime
Amazon Bedrock$5.00 in·$25.00 out·200k·100% upAzure AI Foundry$5.00 in·$25.00 out·200k·100% upAnthropic$5.00 in·$25.00 out·200k·99.9% upGoogle Vertex AI$5.00 in·$25.00 out·200k·100% up
Gemma 4 31B12 hosts
HostInOutContextUptime
DDeepInfrafp4$0.09 in·$0.34 out·262k·99.4% upCCoreWeavefp4$0.10 in·$0.34 out·262k·97.8% upVVenicebf16$0.12 in·$0.36 out·256k·98.8% upCCrusoebf16$0.14 in·$0.40 out·262k·97.7% upFFriendli$0.14 in·$0.40 out·262k·99% upPParasailfp8$0.15 in·$0.40 out·262k·98.6% up
6 more hostsFewer hosts
SSambaNova$0.38 in·$1.15 out·262k·13.3% upTTogether$0.39 in·$0.97 out·262k·84.1% upMModelRunfp4$0.75 in·$1.00 out·262k·99.8% upCChutesfp4degraded$0.12 in·$0.37 out·131k·84.1% upNNovitabf16degraded$0.14 in·$0.40 out·262k·74.7% upSSiliconFlowfp8degraded$0.75 in·$1.00 out·262k·64.3% up

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

Writing DNA

Style Comparison

Similarity
35%

Gemma 4 31B uses 3.5x more transitions

Claude Opus 4.5
Gemma 4 31B
66%Vocabulary57%
51wSentence Length18w
0.82Hedging0.37
6.0Bold7.1
4.5Lists4.0
0.18Emoji0.24
1.46Headings0.94
0.05Transitions0.16
Based on 27 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Against the newest arrivals

Claude Opus 4.5 logoGPT-6 Astra Pro logo
Claude Opus 4.5 vs GPT-6 Astra ProLanded Sep 2026
Gemma 4 31B logoGPT-6 Astra logo
Gemma 4 31B vs GPT-6 AstraLanded Sep 2026
Claude Opus 4.5 logoClaude Fable 5.1 logo
Claude Opus 4.5 vs Claude Fable 5.1Landed Sep 2026
Gemma 4 31B logoMuse Spark 1.3 logo
Gemma 4 31B vs Muse Spark 1.3Landed Sep 2026
Claude Opus 4.5 logoHy4 Preview logo
Claude Opus 4.5 vs Hy4 PreviewLanded Sep 2026
Gemma 4 31B logoGemini 3.8 Flash logo
Gemma 4 31B vs Gemini 3.8 FlashLanded Sep 2026
Claude Opus 4.5 logoMuse Spark 1.3 Contributor logo
Claude Opus 4.5 vs Muse Spark 1.3 ContributorLanded Sep 2026
Gemma 4 31B logoMercury 2.5 Preview logo
Gemma 4 31B vs Mercury 2.5 PreviewLanded Sep 2026

Same lab, same size, long tail

Claude Opus 4.5 logoClaude Opus 4.6 logo
Claude Opus 4.5 vs Claude Opus 4.6Same lab
Claude Opus 4.5 logoClaude Opus 5 logo
Claude Opus 4.5 vs Claude Opus 5Same lab
Gemma 4 31B logoGemini 3.7 Flash logo
Gemma 4 31B vs Gemini 3.7 FlashSame lab
Gemma 4 31B logoGemini 3.6 Flash logo
Gemma 4 31B vs Gemini 3.6 FlashSame lab
Gemma 4 31B logoGPT-1 logo
Gemma 4 31B vs GPT-1New provider
Gemma 4 31B logoOptimus Alpha logo
Gemma 4 31B vs Optimus AlphaNew provider
Gemma 4 31B logoOwl Alpha logo
Gemma 4 31B vs Owl AlphaNew provider
Claude Opus 4.5 logoOx Alpha logo
Claude Opus 4.5 vs Ox AlphaNew provider

Model pages

Claude Opus 4.5 logo
Claude Opus 4.558 outputs, specs and price
Gemma 4 31B logo
Gemma 4 31B49 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed