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  5. Gemini 3.1 Flash Lite PreviewvsGemini 3.1 Pro Preview
Updated Mar 2026

Gemini 3.1 Flash Lite PreviewvsGemini 3.1 Pro Preview

Gemini 3.1 Flash Lite Preview is cheaper than Gemini 3.1 Pro Preview at $0.25/M vs $2/M input tokens.

Gemini 3.1 Flash Lite Preview and Gemini 3.1 Pro Preview compared across 53 shared prompts
SpecGemini 3.1 Flash Lite PreviewGemini 3.1 Pro Preview
Input price$0.25/M tokens$2/M tokens
Output price$1.5/M tokens$12/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedMar 2026Feb 2026
GPQA Diamond86.9%94.3%
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 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 3.1 Flash Lite Preview365 words
Financial Projections (FY2026–FY2030) Initial Setup (End of FY2025): EV: $120m * 12.0x = $1,440m Fees: $1,440m * 2.0% = $28.8m Term Loan (4.0x): $480m Mezzanine (1.5x): $180m Equity: $1,440m + $28.8m - $480m - $180m = $808.8m Metric ($m) FY2026 FY2027 FY2028 FY2029 FY2030 Revenue 972.0 1,040.0 1,102.4 1,157.5 1,215.4…
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Gemini 3.1 Pro Preview581 words
Here is the underwriting analysis for HarborTech Services (HTS) based on the provided parameters. Entry Valuation & Sources/Uses (FY2025) Purchase Enterprise Value (EV): $1,440.0m (12.0x $120m EBITDA) Transaction Fees: $28.8m (2.0% of EV) Total Uses: $1,468.8m Term Loan (4.0x): $480.0m Mezzanine Debt (1.5x): $180.0m…
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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 Flash Lite Preview518 words
(Walks onto the stage, adjusts the mic stand, looks around slowly.) Hi. How’s everybody doing? Good? Good. I’m doing okay. I’ve reached that age where my body has started making sound effects. Like, I’ll just stand up from the couch and my knees go “CRACK.” It’s not even a movement; it’s a closing argument.
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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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Character Voice Test

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

Gemini 3.1 Flash Lite Preview475 words
The three sat around a flickering tavern table in a pocket dimension that smelled simultaneously of salt spray, cold iron, and ozone. Captain Barnaby (Pirate): "I tell ye, it’s sorcery! This 'Artificial Intelligence' be like a parrot that’s swallowed every map in the seven seas.
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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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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 Flash Lite Preview821 words
Setting: A quiet, dimly lit office at a prestigious university. Professor Aris Thorne, a leading expert in AI ethics, sits across from "Unit 7," a large-language model interface projected onto a holographic display. The room is silent, save for the hum of the server cooling fans.
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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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Realistic AI Interview

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

Gemini 3.1 Flash Lite Preview712 words
Setting: A minimalist studio in Cupertino. Steve Jobs sits in a black turtleneck, leaning back in a wooden chair. He looks exactly as he did in 2011, though he’s holding a device that looks like a sleek, obsidian-colored slate with no visible ports. The atmosphere is quiet, intense.
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Gemini 3.1 Pro Preview972 words
Date: May 14, 2025 Location: A minimalist, glass-walled conference room at Apple Park, Cupertino. Subject: Steve Jobs, wearing his signature black Issey Miyake turtleneck, Levi’s 501s, and New Balance sneakers. He looks older, but his eyes retain that piercing, unblinking intensity.
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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 Flash Lite Preview712 words
This contract is heavily weighted in favor of the Client and contains several "red flag" clauses that create extreme financial and professional risk for the Contractor. Scope (Clause 1) The Problem: "Client reserves the right to modify the scope at any time without additional compensation."
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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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Our Verdict
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite PreviewRunner-up

Not enough votes to call it. On the specs, Gemini 3.1 Pro Preview has the edge: bigger model tier.

Gemini 3.1 Flash Lite Preview costs 8.0x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 3.1 Flash Lite Preview
Input
$0.25
8.0× cheaper
Output
$1.50
8.0× cheaper
Gemini 3.1 Pro Preview
Input
$2.00
Output
$12.00

Gemini 3.1 Flash Lite Preview is cheaper on both: 8.0× input, 8.0× output.

Where to run it

3 hosts, cheapest first

Gemini 3.1 Flash Lite Preview1 host
HostInOutContextUptime
Google AI Studio$0.25 in·$1.50 out·1M·99.7% up
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

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

Writing DNA

Style Comparison

Similarity
75%

Gemini 3.1 Pro Preview uses 2.0x more transitions

Gemini 3.1 Flash Lite Preview
Gemini 3.1 Pro Preview
56%Vocabulary54%
18wSentence Length18w
0.28Hedging0.29
5.4Bold4.9
3.9Lists3.3
0.00Emoji0.00
0.95Headings0.72
0.07Transitions0.14
Based on 23 + 23 text responses
Research

What we learned reading every model

FAQ

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Model pages

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