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  5. ChatGPT-4o (March 2025)vsGemini 2.5 Flash Preview
Updated Apr 2025

ChatGPT-4o (March 2025)vsGemini 2.5 Flash Preview

Gemini 2.5 Flash Preview is cheaper than ChatGPT-4o (March 2025) at $0.15/M vs $5/M input tokens.

ChatGPT-4o (March 2025) and Gemini 2.5 Flash Preview compared across 16 shared prompts
SpecChatGPT-4o (March 2025)Gemini 2.5 Flash Preview
Input price$5/M tokens$0.15/M tokens
Output price$15/M tokens$0.6/M tokens
Context window128K tokens1.0M tokens
ParametersNot disclosedNot disclosed
Free API (OpenRouter)NoNo
ReleasedMar 2025Apr 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 16 prompts both answered. Formatting stripped, words untouched.

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.
Read the full answer
Gemini 2.5 Flash Preview1,462 words
Okay, here is a conversation between an AI model designed for complex reasoning and dialogue, named 'Synapse', and a leading expert in AI ethics and philosophy, Professor Alistair Finch. Characters: Synapse: A large, advanced AI model capable of introspection and generating complex arguments.
Read the full answer

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

ChatGPT-4o (March 2025)265 words
Recipe Name: Maple Cinnamon Toast Bites Description: A quick and delicious sweet treat made with pantry staples! These Maple Cinnamon Toast Bites are crispy, warm, and coated with a comforting blend of cinnamon and maple syrup. Perfect for a cozy snack or a fun breakfast twist.
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Gemini 2.5 Flash Preview221 words
Dish Name: Sunshine Lemon-Ricotta Mugs (Sweet & Simple!) This light and flavorful dessert comes together quickly for a little sweet treat . Ingredients (7 Common Pantry Staples): Ricotta cheese (whole milk or part-skim) Granulated sugar Lemon zest (from one lemon) Vanilla extract All-purpose flour Baking powder Large…
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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.
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Gemini 2.5 Flash Preview530 words
Okay, here's a 3-minute stand-up routine, pun-free and focused on relatable everyday annoyances. (Start) (Walk up to mic, adjust slightly) Alright, hey everybody! Thanks for being here. Good to see you. So, I was thinking the other day... we live in the future, right?
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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 2.5 Flash Preview79 words
Here are 5 jokes: Why did the dog cross the road? To get to the barking lot! Why was the computer cold? Because it left its Windows open! Knock, knock. Who's there? Boo. Boo who? Don't cry, it's just a joke! What do you call a fish with no eyes? Fsh! Why did the bicycle fall over? Because it was two tired!
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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 2.5 Flash Preview1,134 words
A Glimpse Beyond the Black Turtleneck: Steve Jobs in 2025 on the Future of AI (Setting: A minimalist, immaculately clean, but perhaps slightly less spartan-than-usual interview room. Think if a modern art museum had a small lounge.
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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.
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Gemini 2.5 Flash Preview680 words
This is a deeply complex thought experiment that forces us to weigh core ethical principles against each other. There is no easy answer, and any decision involves significant moral compromises.
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Our Verdict
ChatGPT-4o (March 2025)
ChatGPT-4o (March 2025)
Gemini 2.5 Flash Preview
Gemini 2.5 Flash Preview

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

Gemini 2.5 Flash Preview costs 25x 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 2.5 Flash Preview
Input
$0.15
33× cheaper
Output
$0.60
25× cheaper

Gemini 2.5 Flash Preview is cheaper on both: 33× input, 25× output.

Writing DNA

Style Comparison

Similarity
41%

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

ChatGPT-4o (March 2025)
Gemini 2.5 Flash Preview
55%Vocabulary51%
24wSentence Length15w
0.52Hedging0.70
3.3Bold4.1
6.0Lists3.3
0.94Emoji0.00
0.63Headings0.09
0.05Transitions0.24
Based on 15 + 12 text responses
Research

What we learned reading every model

FAQ

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Model pages

ChatGPT-4o (March 2025) logo
ChatGPT-4o (March 2025)33 outputs, specs and price
Gemini 2.5 Flash Preview logo
Gemini 2.5 Flash Preview28 outputs, specs and price
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