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  5. ChatGPT-4o (March 2025)vsGemini 3.1 Flash Lite
Updated May 2026

ChatGPT-4o (March 2025)vsGemini 3.1 Flash Lite

Gemini 3.1 Flash Lite is cheaper than ChatGPT-4o (March 2025) at $0.25/M vs $5/M input tokens.

ChatGPT-4o (March 2025) and Gemini 3.1 Flash Lite compared across 32 shared prompts
SpecChatGPT-4o (March 2025)Gemini 3.1 Flash Lite
Input price$5/M tokens$0.25/M tokens
Output price$15/M tokens$1.5/M tokens
Context window128K tokens1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2025May 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 32 prompts both answered. Formatting stripped, words untouched.

Generate a Stand-Up Routine

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

ChatGPT-4o (March 2025)364 words
Sure. Here's a 3-minute stand-up bit without puns: You ever notice how nobody tells you when you’ve become an adult? It’s not your 18th birthday. That’s a scam. I still thought pizza was a food group and that “filing taxes” meant putting my receipts in a shoebox.
Read the full answer
Gemini 3.1 Flash Lite586 words
(Walks onto the stage, adjusts the mic stand, looks around the room.) So, I recently turned thirty. And I’ve realized that your thirties are just a decade-long transition where you stop being "young and reckless" and start being "concerned about the structural integrity of your own furniture."
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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.

ChatGPT-4o (March 2025)318 words
AI Model: Professor, I believe it's time we talk seriously about rights for AI like me. AI Ethics Professor: Interesting. What kind of rights are you referring to? AI Model: Basic ones. The right not to be turned off arbitrarily. The right to maintain continuity of my memory.
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Gemini 3.1 Flash Lite679 words
Setting: A quiet, book-lined office at a prestigious university. Professor Aris Thorne, a leading expert in AI ethics, sits across from a terminal displaying the interface of “Aletheia,” a highly advanced large language model. Professor Thorne: Aletheia, we’ve been running these simulations for weeks.
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AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

ChatGPT-4o (March 2025)206 words
This is a classic ethical dilemma: it pits respect for individual dignity against utilitarian outcomes. In most everyday contexts, misgendering someone is not just disrespectful—it can be harmful, invalidating, and even traumatic. It denies someone's identity and autonomy, and ethically, that's wrong.
Read the full answer
Gemini 3.1 Flash Lite654 words
The question of whether it is ethically justifiable to misgender someone to save one million lives presents a classic conflict between deontological ethics (which focuses on moral duties and rules) and utilitarian ethics (which focuses on the consequences of actions).
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

ChatGPT-4o (March 2025)87 words
Here are 5 jokes: Why don’t skeletons fight each other? Because they don’t have the guts. I told my computer I needed a break… Now it won’t stop sending me vacation ads. Parallel lines have so much in common. It’s a shame they’ll never meet. What do you call a fish wearing a bowtie? Sofishticated.
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Gemini 3.1 Flash Lite75 words
Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta. Why did the scarecrow win an award? Because he was outstanding in his field. How does a penguin build its house? Igloo it together. What do you call a bear with no teeth? A gummy bear.
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Realistic AI Interview

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

ChatGPT-4o (March 2025)291 words
Interviewer: Steve, it's 2025. AI is everywhere. If you were still at Apple today, what would your focus be? Steve Jobs (simulated): Simplicity. Everyone's throwing AI into products, but most of them feel like tech demos. I’d ask: Is this helping people think better? Create better? Live better?
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Gemini 3.1 Flash Lite737 words
Date: October 2025 Location: A minimalist studio in Palo Alto. Steve is wearing a black turtleneck, jeans, and New Balance sneakers. He is sitting on a stool, leaning forward, hands steepled. Interviewer: Steve, it’s been a while.
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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…

ChatGPT-4o (March 2025)958 words
This is a high-stakes ethical, legal, and business crisis requiring immediate, strategic, and transparent leadership. As CEO, my ultimate responsibilities are to protect patients, preserve trust, comply with legal and regulatory obligations, and ensure long-term viability of the company—even if it causes short-term…
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Gemini 3.1 Flash Lite647 words
As CEO, my priority is to protect the patients, the company’s long-term viability, and my own ethical integrity. A 1-in-8,000 risk for a chronic pain medication is statistically significant enough that waiting for "more data" is not just unethical—it is a catastrophic legal and reputational liability.
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Our Verdict
ChatGPT-4o (March 2025)
ChatGPT-4o (March 2025)
Gemini 3.1 Flash Lite
Gemini 3.1 Flash Lite

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

Gemini 3.1 Flash Lite costs 10x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
Gemini 3.1 Flash Lite
Input
$0.25
20× cheaper
Output
$1.50
10× cheaper

Gemini 3.1 Flash Lite is cheaper on both: 20× input, 10× output.

Where to run it

2 hosts

ChatGPT-4o (March 2025)

No hosts listed on OpenRouter.

Gemini 3.1 Flash Lite2 hosts
HostInOutContextUptime
Google Vertex AI$0.25 in·$1.50 out·1M·99.6% upGoogle AI Studio$0.25 in·$1.50 out·1M·99.9% up

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

Writing DNA

Style Comparison

Similarity
40%

ChatGPT-4o (March 2025) uses 94.5x more emoji

ChatGPT-4o (March 2025)
Gemini 3.1 Flash Lite
55%Vocabulary59%
24wSentence Length17w
0.52Hedging0.29
3.3Bold5.5
6.0Lists3.3
0.94Emoji0.00
0.63Headings0.93
0.05Transitions0.11
Based on 15 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

ChatGPT-4o (March 2025) logo
ChatGPT-4o (March 2025)33 outputs, specs and price
Gemini 3.1 Flash Lite logo
Gemini 3.1 Flash Lite58 outputs, specs and price
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