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  5. Gemini 3.6 FlashvsGPT-4o (Omni)
Updated Jul 2026

Gemini 3.6 FlashvsGPT-4o (Omni)

Gemini 3.6 Flash is cheaper than GPT-4o (Omni) at $1.5/M vs $2.5/M input tokens.

Gemini 3.6 Flash and GPT-4o (Omni) compared across 53 shared prompts
SpecGemini 3.6 FlashGPT-4o (Omni)
Input price$1.5/M tokens$2.5/M tokens
Output price$7.5/M tokens$10/M tokens
Context window1.0M tokens128K tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedJul 2026May 2024
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 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…

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
GPT-4o (Omni)585 words
Day 1 Hour 1-2: Immediate Assessment and Information Gathering Objective: Gather all available data on the side effect, including the internal research report, patient case studies, and any existing literature. Reasoning: A comprehensive understanding of the situation is crucial for informed decision-making.
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Character Voice Test

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

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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GPT-4o (Omni)139 words
Pirate: Arrr, what be this "AI model" ye speak of? Some kind o’ magic map that tells ye where the treasure be? Knight: Nay, scoundrel! ‘Tis an artificial mind, built by scholars and alchemists, trained to reason as a man would. It doth not wield sword nor shield, yet its knowledge is vast.
Read the full answer

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

Gemini 3.6 Flash656 words
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…
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GPT-4o (Omni)514 words
Simplified Year-by-Year Financial Table (FY2026–FY2030) FY2026 Revenue: $972m (8% growth) EBITDA: $136.08m (14.0% margin) Cash Interest: Term Loan: $43.2m (9.0% of $480m) Mezzanine: $21.6m (12.0% of $180m) Cash Taxes: $17.07m (25% of EBITDA - cash interest) Capex: $29.16m (3.0% of revenue) ΔNWC: $3.6m (0.5% of…
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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

Gemini 3.6 Flash1,131 words
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.
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GPT-4o (Omni)453 words
Interviewer: Steve, it's 2025. AI is advancing at an incredible pace. If you were here today, how would you see its role in technology? Steve Jobs: You know, people always focus on technology itself. But what really matters is how it enhances the human experience.
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Generate a Stand-Up Routine

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

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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GPT-4o (Omni)380 words
3-Minute Stand-Up Comedy Routine (Walks on stage, looks around, shakes head.) You ever wake up in the morning, stretch, take a deep breath... and immediately regret all your life choices? I woke up today, my body made a noise I’ve never heard before.
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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.

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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GPT-4o (Omni)593 words
Title: "Do AI Deserve Rights?" Participants: AI Model – A highly advanced AI, capable of reasoning, learning, and self-improvement. Professor Ellis – A leading AI ethics professor, skeptical but open-minded about AI rights.
Read the full answer
Our Verdict
Gemini 3.6 Flash
Gemini 3.6 Flash
GPT-4o (Omni)
GPT-4o (Omni)

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

Gemini 3.6 Flash
Input
$1.50
1.7× cheaper
Output
$7.50
1.3× cheaper
GPT-4o (Omni)
Input
$2.50
Output
$10.00

Gemini 3.6 Flash is cheaper on both: 1.7× input, 1.3× output.

Where to run it

4 hosts, cheapest first

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
GPT-4o (Omni)2 hosts
HostInOutContextUptime
Azure AI Foundry$2.50 in·$10.00 out·128k·99.8% upOpenAI$2.50 in·$10.00 out·128k·99.9% up

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

Writing DNA

Style Comparison

Similarity
35%

GPT-4o (Omni) uses 5.7x more hedging

Gemini 3.6 Flash
GPT-4o (Omni)
60%Vocabulary54%
19wSentence Length18w
0.13Hedging0.72
5.4Bold7.3
2.7Lists5.6
0.04Emoji0.03
0.99Headings1.40
0.07Transitions0.26
Based on 27 + 24 text responses
Research

What we learned reading every model

FAQ

Common questions

Gemini 3.6 Flash is developed by Google AI while GPT-4o (Omni) is developed by OpenAI. Gemini 3.6 Flash has a 1.0M token context window vs GPT-4o (Omni)'s 128K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 3.6 Flash and GPT-4o (Omni) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

Gemini 3.6 Flash costs $1.5/M input tokens and GPT-4o (Omni) costs $2.5/M input tokens. Gemini 3.6 Flash is $1.00/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 Gemini 3.6 Flash and GPT-4o (Omni) 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

Gemini 3.6 Flash logo
Gemini 3.6 Flash58 outputs, specs and price
GPT-4o (Omni) logo
GPT-4o (Omni)54 outputs, specs and price
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