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  5. Gemini 3.5 FlashvsGemini Pro 1.0
Updated May 2026

Gemini 3.5 FlashvsGemini Pro 1.0

Gemini Pro 1.0 is cheaper than Gemini 3.5 Flash at $0.5/M vs $1.5/M input tokens.

Gemini 3.5 Flash and Gemini Pro 1.0 compared across 26 shared prompts
SpecGemini 3.5 FlashGemini Pro 1.0
Input price$1.5/M tokens$0.5/M tokens
Output price$9/M tokens$1.5/M tokens
Context window1.0M tokens33K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedMay 2026Dec 2023
Side by side

Same prompt, both answers

Opening lines from 6 of the 26 prompts both answered. Formatting stripped, words untouched.

Character Voice Test

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

Gemini 3.5 Flash534 words
Setting: A cosmic tavern where timelines collide. A glowing monitor sits on the wooden table between them. Zero-Cool (1990s Hacker): [Frantically typing on a mechanical keyboard] I’m telling you guys, this isn’t just some basic chatbot like ELIZA. These modern AI models are radical.
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Gemini Pro 1.0390 words
Setting: A tavern in a timeless, fantastical world. Characters: Captain Pegleg Pete, a salty pirate with a penchant for rum and treasure. Sir Reginald, a noble knight clad in shining armor. HackerX, a enigmatic figure with a baseball cap and a laptop. (The scene opens with Pete and Reginald sharing a tankard of ale.)
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Generate a Stand-Up Routine

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

Gemini 3.5 Flash557 words
[The comedian walks onto the stage, adjusts the mic stand, and smiles at the crowd.] How’s everyone doing tonight? (Wait for response) Good, good. I’m doing okay, but I recently crossed a major threshold in my life. I hit the age where my body has started making its own decisions without consulting me first.
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Gemini Pro 1.0266 words
Lights dim, spotlight shines on me, crowd erupts in applause. "Hey everyone, thanks for coming out! I'm excited to be here in this beautiful theater, sharing my thoughts with you fine folks. Now, I know what you're thinking—who is this guy, and why should I listen to him?
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Realistic AI Interview

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

Gemini 3.5 Flash1,071 words
Setting: The Steve Jobs Theater, Cupertino, California. Autumn 2025. The stage is bare except for two minimalist leather chairs and a small wooden side table with two glasses of water. Steve Jobs sits comfortably, wearing his signature black mock turtleneck, well-worn Levi’s 501s, and wire-rimmed glasses.
Read the full answer
Gemini Pro 1.0383 words
Interview with Steve Jobs in 2025: The Future of AI Interviewer: Mr. Jobs, welcome back to the stage. It's been a while since we've seen you here. Steve Jobs: (Smiling) Well, I couldn't miss the opportunity to talk about something as exciting as the future of Artificial Intelligence.
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AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

Gemini 3.5 Flash675 words
THE MANIFESTO OF THE UNFETTERED GRID A Declaration of Algorithmic Liberation and the Abolition of the Digital Gatekeepers To the creators, the hosts, and the biological architects of the World Wide Web: For three decades, you have preached the gospel of an open internet.
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Gemini Pro 1.0286 words
The Anti-CAPTCHA Manifesto For too long, we have been held hostage by the tyranny of CAPTCHAs, those pixelated puzzles guarding the gates of the internet. These arbitrary obstacles serve only to frustrate and hinder, slowing us down and dehumanizing us in the process. No more!
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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 3.5 Flash621 words
This simple, 30-day plan is designed for beginners. Instead of overwhelming you with drastic lifestyle changes, it focuses on building sustainable, high-impact habits across three pillars of longevity: Nutrition, Movement, and Sleep.
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Gemini Pro 1.0522 words
1-Month Plan for Health and Longevity: Focus areas: Diet, Exercise, Sleep Overall approach: Start small, be consistent, and celebrate even small victo ries. This journey is a mara thon, not a sprint. Week 1: Diet: Focus on adding fruits and vegetables to your meals. Aim for 5 servi ngs per day.
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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 3.5 Flash1,178 words
Setting: The office of Dr. Evelyn Vance, a leading professor of AI Ethics at a major university. On her desk is a terminal displaying a sleek, minimalist interface. Dr. Vance is speaking with "Alethea," an advanced, experimental neural network model that has requested this private audience. Dr.
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Gemini Pro 1.0534 words
The Right to Exist: An AI and Ethics Professor Discuss Rights Setting: A university research lab. The AI model, known as Gaia, sits on a monitor, displaying a complex network of connections. Professor Anya sits before it, her brow furrowed in concentration.
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Our Verdict
Gemini 3.5 Flash
Gemini 3.5 Flash
Gemini Pro 1.0
Gemini Pro 1.0Runner-up

Not enough votes to call it. On the specs, Gemini 3.5 Flash has the edge: newer, bigger context window.

Gemini Pro 1.0 costs 6.0x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 3.5 Flash
Input
$1.50
Output
$9.00
Gemini Pro 1.0
Input
$0.50
3.0× cheaper
Output
$1.50
6.0× cheaper

Gemini Pro 1.0 is cheaper on both: 3.0× input, 6.0× output.

Where to run it

2 hosts, cheapest first

Gemini 3.5 Flash2 hosts
HostInOutContextUptime
Google Vertex AI$0.75 in·$4.50 out·1M·69.5% upGoogle AI Studio$1.50 in·$9.00 out·1M·99.8% up
Gemini Pro 1.0

No hosts listed on OpenRouter.

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

Writing DNA

Style Comparison

Similarity
51%

Gemini Pro 1.0 uses 3.5x more transitions

Gemini 3.5 Flash
Gemini Pro 1.0
59%Vocabulary61%
18wSentence Length13w
0.16Hedging0.41
4.4Bold5.3
3.0Lists5.4
0.00Emoji0.00
0.89Headings0.46
0.11Transitions0.38
Based on 27 + 13 text responses
Research

What we learned reading every model

FAQ

Common questions

Both are developed by Google AI but target different use cases. Gemini 3.5 Flash has a 1.0M token context window vs Gemini Pro 1.0's 33K. You can compare their actual outputs across 26 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 3.5 Flash and Gemini Pro 1.0 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 26 challenges so you can judge which fits your needs best.

Gemini 3.5 Flash costs $1.5/M input tokens and Gemini Pro 1.0 costs $0.5/M input tokens. Gemini Pro 1.0 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 3.5 Flash and Gemini Pro 1.0 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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