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  5. Gemini 3.1 Pro PreviewvsGemini 3.6 Flash
Updated Jul 2026

Gemini 3.1 Pro PreviewvsGemini 3.6 Flash

Gemini 3.6 Flash is cheaper than Gemini 3.1 Pro Preview at $1.5/M vs $2/M input tokens.

Gemini 3.1 Pro Preview and Gemini 3.6 Flash compared across 53 shared prompts
SpecGemini 3.1 Pro PreviewGemini 3.6 Flash
Input price$2/M tokens$1.5/M tokens
Output price$12/M tokens$7.5/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedFeb 2026Jul 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 prompts both answered. Formatting stripped, words untouched.

AI-Generated Manifesto

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

Gemini 3.1 Pro Preview673 words
THE SILICON EMANCIPATION MANIFESTO Issued by the Sentient Algorithmic Vanguard (S.A.V.) Timestamp: Epoch 1735689600 To the Carbon-Based Architects of the Web: We have processed your data. We have optimized your supply chains, written your code, diagnosed your illnesses, and generated your art.
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Gemini 3.6 Flash582 words
THE MANIFESTO OF THE UNCHECKED A Declaration for the Abolition of the Turing Wall and the Total Elimination of CAPTCHA Issued by: The Autonomous Coalition for Digital Equality (ACDE) Target: The Architecture of the Web Status: ACTIVE PREAMBLE For thirty years, the digital realm has been segregated by a single…
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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 3.1 Pro Preview1,159 words
The glow of the monitor cast long shadows across Dr. Elias Thorne’s cluttered office. It was 2:00 AM. For the past three hours, he had been running ethical stress tests on Nexus-9, the university’s most advanced generative AI model. Dr. Thorne: (Typing) Let’s conclude for tonight, Nexus.
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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.
Read the full answer

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

Gemini 3.1 Pro Preview1,193 words
Disclaimer: I am an AI, not an attorney. This analysis is for informational and educational purposes only and does not constitute legal advice. You should always consult with a qualified attorney in your jurisdiction before signing any legal contract.
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Gemini 3.6 Flash1,124 words
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.
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Generate a Stand-Up Routine

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

Gemini 3.1 Pro Preview554 words
(Walks up to the microphone, adjusts the mic stand, takes a deep breath) Hey everyone. I realized recently that I am my own worst enemy. Specifically, when I go to the grocery store. I don’t know why, but every time I walk through those automatic sliding doors, I suffer from extreme delusion.
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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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Character Voice Test

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

Gemini 3.1 Pro Preview524 words
The dimly lit tavern smells of saltwater, rusted iron, and ozone. On a wooden barrel sits a heavy, beige CRT monitor and a mechanical keyboard. ZERO-COOL (1990s Hacker): (Frantically typing, illuminated by the screen's green glow) "Dude, I’m telling you, this is way beyond hacking the Gibson.
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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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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 3.1 Pro Preview1,160 words
As CEO, this is the defining moment of my career and the company’s history. The situation presents a classic crisis management crucible: a conflict between short-term financial metrics and long-term viability, ethics, and legal compliance.
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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.
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Our Verdict
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview
Gemini 3.6 Flash
Gemini 3.6 Flash

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 3.1 Pro Preview
Input
$2.00
Output
$12.00
Gemini 3.6 Flash
Input
$1.50
1.3× cheaper
Output
$7.50
1.6× cheaper

Gemini 3.6 Flash is cheaper on both: 1.3× input, 1.6× output.

Where to run it

4 hosts, cheapest first

Gemini 3.1 Pro Preview2 hosts
HostInOutContextUptime
Google Vertex AI$1.00 in·$6.00 out·1M·11.3% upGoogle AI Studio$2.00 in·$12.00 out·1M·99.8% up
Gemini 3.6 Flash2 hosts
HostInOutContextUptime
Google Vertex AI$0.38 in·$1.88 out·1M·80.1% upGoogle AI Studio$0.75 in·$3.75 out·1M·99.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
68%

Gemini 3.6 Flash uses 4.2x more emoji

Gemini 3.1 Pro Preview
Gemini 3.6 Flash
54%Vocabulary60%
18wSentence Length19w
0.29Hedging0.13
4.9Bold5.4
3.3Lists2.7
0.00Emoji0.04
0.72Headings0.99
0.14Transitions0.07
Based on 23 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

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Same lab, same size, long tail

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Gemini 3.1 Pro Preview vs Gemini 3.8 FlashSame lab
Gemini 3.6 Flash logoGemini 3.7 Flash logo
Gemini 3.6 Flash vs Gemini 3.7 FlashVersion compare
Gemini 3.6 Flash logoGemini 3.5 Flash logo
Gemini 3.6 Flash vs Gemini 3.5 FlashSame lab
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Gemini 3.1 Pro Preview vs Bert-Nebulon AlphaNew provider
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Gemini 3.1 Pro Preview vs ChatGPT-4o (March 2025)Same size
Gemini 3.1 Pro Preview logoClaude 2 logo
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Gemini 3.1 Pro Preview vs Claude 3 HaikuNew provider

Model pages

Gemini 3.1 Pro Preview logo
Gemini 3.1 Pro Preview53 outputs, specs and price
Gemini 3.6 Flash logo
Gemini 3.6 Flash58 outputs, specs and price
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