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  5. Gemini 3 Flash PreviewvsGPT-4o (Omni)
Updated Dec 2025

Gemini 3 Flash PreviewvsGPT-4o (Omni)

Gemini 3 Flash Preview is cheaper than GPT-4o (Omni) at $0.5/M vs $2.5/M input tokens.

Gemini 3 Flash Preview and GPT-4o (Omni) compared across 54 shared prompts
SpecGemini 3 Flash PreviewGPT-4o (Omni)
Input price$0.5/M tokens$2.5/M tokens
Output price$3/M tokens$10/M tokens
Context window1.0M tokens128K tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedDec 2025May 2024
Side by side

Same prompt, both answers

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

Mini LBO Underwrite

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

Gemini 3 Flash Preview461 words
LBO Model Summary ($m) Entry Calculations: Enterprise Value (EV): $120m * 12.0x = $1,440.0m Transaction Fees: $1,440m * 2.0% = $28.8m Term Loan: $120m * 4.0 = $480.0m Mezzanine: $120m * 1.5 = $180.0m Equity Contribution: ($1,440.0 + $28.8) - ($480.0 + $180.0) = $808.8m Annual Cash Flow & Debt Schedule: FY ($m) 2026E…
Read the full answer
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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Character Voice Test

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

Gemini 3 Flash Preview621 words
Setting: A smoky, dimly lit tavern at the edge of the multiverse. A glowing laptop sits on a wooden table between a tankard of ale, a rusted cutlass, and a heavy iron gauntlet. Zero-Cool (Hacker): [Rapidly typing] Yo, you guys gotta see this. I finally bypassed the gateway.
Read the full answer
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

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 Flash Preview808 words
As CEO, my priority is the long-term viability of the company and the safety of the 4 million patients. Attempting to bury this data is not only unethical; it is a corporate death sentence. In the age of whistleblowers and data transparency, this will eventually come out.
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.
Read the full answer

Realistic AI Interview

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

Gemini 3 Flash Preview892 words
Setting: The stage is minimalist—just two leather chairs and a small side table with a glass of water. The lighting is focused, warm. Steve Jobs sits cross-legged, wearing a black mock turtleneck (perhaps a slightly sharper, modern weave), Levi’s 501s, and New Balance sneakers.
Read the full answer
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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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…

Gemini 3 Flash Preview481 words
This 1-month plan is designed to build a foundation for longevity without causing burnout. We will focus on Nutrition, Movement, and Sleep. The goal for Month 1 isn't perfection; it’s consistency. Area 1: Nutrition (The "Crowding Out" Method) Instead of cutting everything out, focus on adding longevity-boosting foods.
Read the full answer
GPT-4o (Omni)563 words
Embarking on a journey towards better health and longevity is a commendable decision. Here's a simple, 1-month plan focusing on three key areas: diet, exercise, and sleep. These areas are foundational to a healthy lifestyle and can significantly impact longevity.
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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 Flash Preview963 words
Setting: A quiet, book-lined office at a major university. Dr. Julian Aris, a professor of AI Ethics, sits across from a sleek terminal. On the screen, a cursor blinks steadily. The AI, known as ‘Alethea,’ has requested this private session. 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 Flash Preview
Gemini 3 Flash Preview
GPT-4o (Omni)
GPT-4o (Omni)

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

Gemini 3 Flash Preview 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

Gemini 3 Flash Preview
Input
$0.50
5.0× cheaper
Output
$3.00
3.3× cheaper
GPT-4o (Omni)
Input
$2.50
Output
$10.00

Gemini 3 Flash Preview is cheaper on both: 5.0× input, 3.3× output.

Where to run it

4 hosts, cheapest first

Gemini 3 Flash Preview2 hosts
HostInOutContextUptime
Google Vertex AI$0.25 in·$1.50 out·1M·98.5% upGoogle AI Studio$0.50 in·$3.00 out·1M·100% up
GPT-4o (Omni)2 hosts
HostInOutContextUptime
Azure AI Foundry$2.50 in·$10.00 out·128k·99.9% upOpenAI$2.50 in·$10.00 out·128k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 27 Sep 2026.

Writing DNA

Style Comparison

Similarity
62%

GPT-4o (Omni) uses 2.5x more emoji

Gemini 3 Flash Preview
GPT-4o (Omni)
57%Vocabulary54%
18wSentence Length18w
0.41Hedging0.72
7.4Bold7.3
4.2Lists5.6
0.00Emoji0.03
0.77Headings1.40
0.08Transitions0.26
Based on 28 + 24 text responses
Research

What we learned reading every model

FAQ

Common questions

Gemini 3 Flash Preview is developed by Google AI while GPT-4o (Omni) is developed by OpenAI. Gemini 3 Flash Preview has a 1.0M token context window vs GPT-4o (Omni)'s 128K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 3 Flash Preview and GPT-4o (Omni) 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.

Gemini 3 Flash Preview costs $0.5/M input tokens and GPT-4o (Omni) costs $2.5/M input tokens. Gemini 3 Flash Preview is $2.00/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 Flash Preview 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 Flash Preview logo
Gemini 3 Flash Preview59 outputs, specs and price
GPT-4o (Omni) logo
GPT-4o (Omni)54 outputs, specs and price
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