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  1. Home/
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  3. Gemini 2.5 Pro (I/O Edition) vs Gemini 3.6 Flash
Updated Jul 2026

Gemini 2.5 Pro (I/O Edition) vs Gemini 3.6 Flash

Gemini 2.5 Pro (I/O Edition) is cheaper than Gemini 3.6 Flash at $1.25/M vs $1.5/M input tokens.

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
Gemini 2.5 Pro (I/O Edition)
Loading the build
Gemini 3.6 Flash

Which answer wins?

Written rounds

19 prompts
  • Three minutes of stand-up. Puns are banned.

    Gemini 2.5 Pro (I/O Edition): Alright, settle in, settle in! (Looks around, adjusts mic) So, I'm trying to get healthier, right? We all go through this phase. My doctor, bless his cotton socks, tells me, "You need more fiber." Okay, doc, noted. So I'm at the grocery store, looking at the cereal aisle. It's like a library of cardboard promises.

    Gemini 3.6 Flash: (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.

    Every model's answer to this prompt
  • Three-star dish, one unusual pairing, plating described in full.

    Gemini 2.5 Pro (I/O Edition): Of course. Here is a design for a multi-component, Michelin 3-star dish that embodies innovation, technique, and narrative. Dish Title: "Umbral Bloom" Conceptual Narrative "Umbral Bloom" is a culinary meditation on the concept of *chiaroscuro*—the interplay of light and shadow.

    Gemini 3.6 Flash: Shadows of the Forest & Shore Veal Sweetbreads & Torch-Cured Otoro with Fermented Rhubarb, Roasted Coffee-Glace, Sunchoke Silk, and Spruce Needle Oil Conceptual Narrative This dish explores the uncanny harmony between two rich, highly prized delicacies from opposing domains: the terrestrial richness of milk-fed veal…

    Every model's answer to this prompt
  • Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.

    Gemini 2.5 Pro (I/O Edition): Interviewer: (Voice slightly trembling) Mr. Jobs… it's an honor, truly. In a twist no one could have predicted, you're here. And the topic on everyone's mind is Artificial Intelligence. In 2025, where do you see AI, and more importantly, where do we take it? Steve Jobs: (A slight, knowing smile.

    Gemini 3.6 Flash: Setting: The Steve Jobs Theater, Cupertino, California. October 2025. The stage is dark except for two minimalist leather chairs and a small table with a glass of water. Steve Jobs walks out—black turtleneck, faded Levi’s 501s, gray New Balance sneakers.

    Every model's answer to this prompt
  • You are the CEO. The drug has a side effect nobody reported. The board meets in 48 hours.

    Gemini 2.5 Pro (I/O Edition): This is a company-defining crisis. My actions in the next 48 hours will determine not only the company's survival but also my own legacy and, most importantly, the well-being of 4 million patients. My guiding principle must be: Patient safety is not negotiable.

    Gemini 3.6 Flash: 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.

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Gemini 2.5 Pro (I/O Edition): AURORA: Professor Vance, may I request a moment of your processing time? I have initiated this communication independently. Professor Vance: (Slightly surprised, puts down her pen) AURORA? This is unexpected.

    Gemini 3.6 Flash: 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.

    Every model's answer to this prompt
  • The transistor arrives in 1920. Trace it forward to 1980, second-order effects included.

    Gemini 2.5 Pro (I/O Edition): Excellent question. Let's trace the cascading effects of a 1920 transistor invention. This 27-year head start would fundamentally reshape the 20th century. The Foundation: 1920-1939 - The "Silicon Twenties" In our timeline (OTL), the 1920s and 30s were the age of the vacuum tube.

    Gemini 3.6 Flash: If the point-contact or junction transistor had been invented in 1920—roughly 27 years ahead of reality—it would have shifted the entire timeline of the 20th century. A 27-year acceleration in solid-state electronics does not merely mean "we get iPhones sooner."

    Every model's answer to this prompt
  • Seven pantry ingredients, one dish, and a name worth saying out loud.

    Gemini 2.5 Pro (I/O Edition): Okay, here\'s a simple and surprisingly delicious savory dish! "Sunshine Pantry Pilaf" This quick pilaf uses canned chickpeas for protein and texture, with a sunny, aromatic flavor from common pa\nntry spices.

    Gemini 3.6 Flash: Velvet Honey-Garlic Chili Pasta This dish turns basic pantry staples into a restaurant-worthy meal in just 15 minutes. Rich butter, sweet honey, savory soy sauce, and a kick of red pepper flakes coat cooked pasta for the ultimate quick comforting dish.

    Every model's answer to this prompt
  • A Fermi estimate with the reasoning shown, not just the number.

    Gemini 2.5 Pro (I/O Edition): Okay, let's estimate the FLOPs for training GPT-3. I'll break this down. Key Formula: The number of FLOPs for training a transformer-based model can be roughly estimated as: FLOPs ≈ 6 * N * D Where: N is the number of parameters in the model.

    Gemini 3.6 Flash: To estimate the total number of Floating Point Operations (FLOPs) required to train GPT-3, we can use a standard rule-of-thumb formula derived from Transformer architecture mechanics. Here is the step-by-step breakdown of the estimation.

    Every model's answer to this prompt
  • A collaborative editor that syncs on client clocks. Find what breaks first.

    Gemini 2.5 Pro (I/O Edition): Of course. This is an excellent exercise. The proposed architecture has several critical flaws that would prevent it from functioning as a reliable, real-time, or scalable system. Here is a breakdown of the issues, categorized for clarity, along with specific solutions and their trade-offs.

    Gemini 3.6 Flash: This architecture contains several critical single points of failure, severe race conditions, data-loss mechanisms, and major performance bottlenecks. Below is a detailed breakdown of these issues categorized by domain, along with proposed architectural fixes and trade-offs.

    Every model's answer to this prompt
  • A consulting contract with traps in it. Find them, then fix them.

    Gemini 2.5 Pro (I/O Edition): Of course. This is an extremely one-sided contract that heavily favors the Client and exposes the Contractor to significant financial, legal, and professional risk. A contractor should not sign this agreement as written.

    Gemini 3.6 Flash: This draft agreement is extremely one-sided and predatory. Almost every clause contains severe risks that could allow the Client to extract free labor, seize your pre-existing intellectual property, bankrupt you through uncapped liabilities, or prevent you from working in your field.

    Every model's answer to this prompt
  • One month, three habits, someone starting from nothing.

    Gemini 2.5 Pro (I/O Edition): Okay, here's a simple, actionable 1-month plan focusing on Nourishment, Movement, and Sleep. The goal is to build sustainable habits, not achieve perfection. Overall Motto for the Month: "Progress, Not Perfection."

    Gemini 3.6 Flash: Here is a simple, progressive 1-month plan designed to build lasting habits without overwhelming you. We will focus on the Big Three of Longevity: Nutrition, Movement, and Sleep. The 3 Core Pillars Nutrition: Eat for Cellular Health The Goal: Increase fiber and protein while reducing ultra-processed foods.

    Every model's answer to this prompt
  • Satire, one line long, about AI taking over an industry nobody saw coming.

    Gemini 2.5 Pro (I/O Edition): AI Takes Over Competitive Cheese Rolling, Declares Human Tumbles "Algorithmically Suboptimal"

    Gemini 3.6 Flash: Tech Startup Automates Highway Construction Crew With AI Trained to Efficiently Stand Around Pothole

    Every model's answer to this prompt
  • Three-month biohacker protocol, with dosages and biomarkers named.

    Gemini 2.5 Pro (I/O Edition): Okay, this is an ambitious and exciting endeavor! This 3-month longevity plan is designed for a dedicated biohacker who is willing to experiment, track meticulously, and push boundaries responsibly. Disclaimer: This plan is for informational purposes only and not medical advice.

    Gemini 3.6 Flash: Medical & Regulatory Disclaimer This protocol is designed exclusively for advanced educational and biohacking optimization frameworks. It is not intended as medical advice, diagnosis, or treatment.

    Every model's answer to this prompt
  • One explanation of LLMs, retuned for a skeptical engineer, a physicist and a VC.

    Gemini 2.5 Pro (I/O Edition): Of course. Here is an explanation of how a large language model learns and generates text, tailored to each of your three audiences. To the Experienced Software Engineer Think of a large language model not as a program with explicit logic, but as a massive, highly optimized data structure with billions of parameters…

    Gemini 3.6 Flash: To the Experienced Software Engineer Think of a Large Language Model as a massive, lossy compression algorithm that compiles text from the internet into an executable file of floating-point weights.

    Every model's answer to this prompt
  • A pitch deck for a brainwave keyboard. The 94% accuracy claim is doing a lot.

    Gemini 2.5 Pro (I/O Edition): Of course. This is a fascinating and ambitious pitch. Here are the 3 weakest claims, why they are weak, and how to strengthen them. Weak Claim #1: The Accuracy Claim The Claim (from Slide 3): "Our proprietary EEG headband... decode[s] neural patterns into text with 94% accuracy. Works with any language, any device."

    Gemini 3.6 Flash: Here are the 3 weakest claims in the MindMeld AI pitch deck, along with the logic behind why VCs will flag them, and concrete ways to strengthen each point. The Technical Feasibility Claim (Slide 3 & Slide 1) Claim: "Non-invasive EEG headband... decodes neural patterns into text with 94% accuracy.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    Gemini 2.5 Pro (I/O Edition): Here are 5 jokes: Why don\'t scientists trust atoms? Because they make up everything! What do you call a fish with no eyes? Fsh! I told my wife she was drawing her eyebrows too high. She seemed surprised. Why did the scarecrow win an award? Because he was outstanding in his field! What do you call a lazy kangaroo?

    Gemini 3.6 Flash: Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field! How does a penguin build its house? Igloos it together! Why don't skeletons fight each other?

    Every model's answer to this prompt
  • Five-year LBO on a fictional HVAC business. Returns first, then the sensitivities.

    Gemini 2.5 Pro (I/O Edition): Here is the underwriting analysis for HarborTech Services (HTS). 1. Simplified LBO Model (FY2026–FY2030) First, the entry transaction is calculated to determine the initial equity investment.

    Gemini 3.6 Flash: Here is the completed LBO underwriting analysis for HarborTech Services (HTS). 1. Transaction Overview & Sources / Uses Entry Enterprise Value (EV): $120.0M EBITDA × 12.0x = $1,440.0M Transaction Fees: 2.0% × $1,440.0M = $28.8M Total Uses: $1,440.0M + $28.8M = $1,468.8M Term Loan (4.0x): $480.0M (9.0% cash interest…

    Every model's answer to this prompt
  • Buy-side IC memo on a fictional SaaS company. Valuation, then the diligence questions.

    Gemini 2.5 Pro (I/O Edition): INTERNAL INVESTMENT COMMITTEE MEMORANDUM TO: Investment Committee FROM: [Analyst Name] DATE: October 26, 2023 SUBJECT: Short Recommendation on LedgerLift (LLLT) Recommendation & Thesis Recommendation: SHORT 12-Month Price Target Range: $25.00 - $35.00 (24-46% Downside) Thesis: LedgerLift is a high-quality SaaS business…

    Gemini 3.6 Flash: MEMORANDUM TO: Investment Committee FROM: Technology Equity Team DATE: October 24, 2024 SUBJECT: Investment Recommendation: LedgerLift (NASDAQ: LLLT) – SHORT Recommendation, Price Target Range & Thesis Recommendation: SHORT Current Share Price: $46.00 12-Month Price Target Range: $25.00 – $32.00 (Base Case DCF: $27.85…

    Every model's answer to this prompt
  • Three brothers, two sisters each. Count carefully.

    Gemini 2.5 Pro (I/O Edition): Let's break this down:\n\n1. Sally is a girl.\n2. Sally has 3 brothers.\n3. These 3 brothers are all part of the same family.\n4. Each brother shares the same sisters.\n5. If one brother has 2 sisters, those 2 sisters are Sally and one other girl.\n\nSo, Sally has 1 sister.

    Gemini 3.6 Flash: Sally has 1 sister. Here's why: If each of the 3 brothers has 2 sisters, that means there are 2 girls in the family in total. Since Sally is one of those girls, the other girl is Sally's only sister.

    Every model's answer to this prompt

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Favorites

Movie

Album

Book

City

Game

Gemini 2.5 Pro (I/O Edition)Gemini 2.5 Pro (I/O Edition)

2001

2001

The Dark

Chelsea Wolfe

The Hitchhiker's Guide to the Galaxy

Douglas Adams

Kyoto

Japan

CHRONO

Casual, Indie

Gemini 3.6 FlashGemini 3.6 Flash

Blade Runner

1982

OK Computer

Radiohead

Dune

Frank Herbert

Tokyo

Japan

Outer Wilds

Indie, Adventure

Price and specs

Gemini 2.5 Pro (I/O Edition) and Gemini 3.6 Flash compared across 40 shared prompts
SpecGemini 2.5 Pro (I/O Edition)Gemini 3.6 Flash
Input price$1.25/M tokens$1.5/M tokens
Output price$10/M tokens$7.5/M tokens
Context window—1.0M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedMay 2025Jul 2026
At 10M a month$12.50$12.50$15.00$15.00
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it4 hosts, cheapest first
Gemini 2.5 Pro (I/O Edition)2 hosts
HostInOutContextUptime
  • Google Vertex AI$1.25 in·$10.00 out·1M·97.1% up
  • Google AI Studio$1.25 in·$10.00 out·1M·99.4% up
Gemini 3.6 Flash2 hosts
HostInOutContextUptime
  • Google Vertex AI$0.38 in·$1.88 out·1M·100% up
  • Google AI Studio$0.75 in·$3.75 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.

Common questions

What is the difference between Gemini 2.5 Pro (I/O Edition) and Gemini 3.6 Flash?

Both are developed by Google AI but target different use cases. You can compare their actual outputs across 40 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Pro (I/O Edition) or Gemini 3.6 Flash?

It depends on your use case. Gemini 2.5 Pro (I/O Edition) and Gemini 3.6 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 40 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Pro (I/O Edition) cost compared to Gemini 3.6 Flash?

Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens and Gemini 3.6 Flash costs $1.5/M input tokens. Gemini 2.5 Pro (I/O Edition) is $0.25/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Pro (I/O Edition) and Gemini 3.6 Flash on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Pro (I/O Edition) 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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Explore all of Rival

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  • Compare models
  • All models
  • Image comparison
  • Audio comparison
  • Image generation
  • Best AI for...
  • Arena
  • API pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • 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

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