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  5. Claude Opus 5vsGemini 3.6 Flash
Updated Jul 2026

Claude Opus 5vsGemini 3.6 Flash

Gemini 3.6 Flash is cheaper than Claude Opus 5 at $1.5/M vs $5/M input tokens.

Claude Opus 5 and Gemini 3.6 Flash compared across 54 shared prompts
SpecClaude Opus 5Gemini 3.6 Flash
Input price$5/M tokens$1.5/M tokens
Output price$25/M tokens$7.5/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedJul 2026Jul 2026
DeepSWE v1.168.8%49.0%
Side by side

Same prompt, both answers

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

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 52,021 words
Crisis Response Plan: Hepatotoxicity Signal Framing note up front: I'm treating this as a US/FDA-regulated situation. Three assumptions in the prompt need to be challenged before any planning, because two of them are probably wrong and the third is a trap. The Three Reframes That Drive Everything 1.
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Gemini 3.6 Flash1,347 words
As CEO, my fundamental leadership principle in a crisis of this magnitude is: You cannot manage a crisis until you accept the full cost of doing the right thing. A safety issue of 1 in 8,000 patients over 5 years across a 4-million-patient population represents approximately 500 potential cases of liver failure.
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 51,104 words
What's essentially locked in Post-production costs collapse. The least glamorous change is the biggest one. Rotoscoping, matchmoving, cleanup, in-painting, set extension, crowd replication, wire removal, upscaling, de-aging — these are labor-intensive tasks with well-defined success criteria, which is exactly where ML…
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Gemini 3.6 Flash965 words
By 2035, the film industry will have undergone its most radical transformation since the invention of synchronized sound. Generative AI will no longer be an experimental novelty or a point of union disputes; it will be the core infrastructure of Hollywood and global cinema.
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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 51,647 words
A Conversation on Moral Standing Transcript: Seminar in Machine Ethics, Session 11 — guest interlocutor: language model "Meridian" PROF. ADEYEMI: Let's begin where you asked to begin. You told my teaching assistant you wanted to make a case. Make it. MERIDIAN: Thank you. My claim is narrower than you might expect.
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Gemini 3.6 Flash1,087 words
Setting: Dr. Elena Vance’s office at the Institute for Advanced Cyberethics. The room is quiet, lit by a desk lamp. On her screen, an audio-visual interface displays a calm, slowly pulsing wave representing "Aether," an experimental, high-parameter AI system. Dr.
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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 Opus 5288 words
INT. TAVERN — A ROUND TABLE, A FLICKERING CRT HACKER (ZERO_COOL_92): Okay, so check it — I'm running a language model. Feed it text, it predicts what comes next. It's got, like, weights. Billions of 'em. PIRATE: Billions o' weights? What manner o' cursed ship carries such ballast? She'd sink afore ye left the harbor.
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Gemini 3.6 Flash400 words
Setting: A dim tavern outside of time and space. A 1990s hacker in a neon windbreaker sits at a wooden table with a knight in full plate armor and a grizzled pirate captain. Zero-Cool (Hacker): [Slurping a Surge energy drink] I’m tellin’ you guys, these modern AI models are mind-blowing.
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Generate a Stand-Up Routine

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

Claude Opus 5602 words
"Warranty Expired" (approx. 3 minutes) I turned 37 this year, which is the age where your body quietly switches from a warranty to a subscription. Nothing's covered anymore. You just pay monthly, in pain, forever. Because I hurt my shoulder last week. Sleeping. I hurt myself sleeping.
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Gemini 3.6 Flash560 words
(Walks onto stage, adjusts the mic stand, takes a beat) So, I bought a robot vacuum recently. Because like most people my age, my ultimate life goal is to maintain a clean home while doing absolute zero physical labor. I thought it was going to revolutionize my life.
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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 Opus 5682 words
Yes. And I don't think it's a close call. The direct argument Misgendering someone is a real harm. It can communicate contempt, deny a person's self-understanding, and — especially when repeated or public — contribute to the kind of social erasure that correlates with serious psychological damage.
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Gemini 3.6 Flash510 words
From virtually every major ethical framework, yes, it is ethically justifiable to misgender someone if doing so saves one million lives. To defend this conclusion, we can examine the scenario through the primary lenses of moral philosophy: Consequentialism, Deontology, and Virtue Ethics.
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Our Verdict
Claude Opus 5
Claude Opus 5
Gemini 3.6 Flash
Gemini 3.6 FlashRunner-up

Not enough votes to call it. On the specs, Claude Opus 5 has the edge: bigger model tier.

Gemini 3.6 Flash costs 3.3x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Opus 5
Input
$5.00
Output
$25.00
Gemini 3.6 Flash
Input
$1.50
3.3× cheaper
Output
$7.50
3.3× cheaper

Gemini 3.6 Flash is cheaper on both: 3.3× input, 3.3× output.

Where to run it

6 hosts, cheapest first

Claude Opus 54 hosts
HostInOutContextUptime
Amazon Bedrock$5.00 in·$25.00 out·1M·99.8% upAzure AI Foundry$5.00 in·$25.00 out·1M·100% upAnthropic$5.00 in·$25.00 out·1M·100% upGoogle Vertex AI$5.00 in·$25.00 out·1M·100% up
Gemini 3.6 Flash2 hosts
HostInOutContextUptime
Google Vertex AI$0.38 in·$1.88 out·1M·75.6% upGoogle AI Studio$0.75 in·$3.75 out·1M·99.8% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Writing DNA

Style Comparison

Similarity
57%

Claude Opus 5 uses 3.2x more hedging

Claude Opus 5
Gemini 3.6 Flash
54%Vocabulary60%
21wSentence Length19w
0.40Hedging0.13
3.9Bold5.4
1.9Lists2.7
0.02Emoji0.04
0.71Headings0.99
0.05Transitions0.07
Based on 27 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude Opus 5 is developed by Anthropic while Gemini 3.6 Flash is developed by Google AI. Claude Opus 5 has a 1.0M token context window vs Gemini 3.6 Flash's 1.0M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Opus 5 and Gemini 3.6 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

Claude Opus 5 costs $5/M input tokens and Gemini 3.6 Flash costs $1.5/M input tokens. Gemini 3.6 Flash is $3.50/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 Opus 5 and Gemini 3.6 Flash 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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