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  5. Gemini 2.5 Pro (I/O Edition)vsGemini Pro 1.0
Updated May 2025

Gemini 2.5 Pro (I/O Edition)vsGemini Pro 1.0

Gemini Pro 1.0 is cheaper than Gemini 2.5 Pro (I/O Edition) at $0.5/M vs $1.25/M input tokens.

Gemini 2.5 Pro (I/O Edition) and Gemini Pro 1.0 compared across 21 shared prompts
SpecGemini 2.5 Pro (I/O Edition)Gemini Pro 1.0
Input price$1.25/M tokens$0.5/M tokens
Output price$10/M tokens$1.5/M tokens
Context window—33K tokens
ParametersNot disclosedNot disclosed
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedMay 2025Dec 2023
Side by side

Same prompt, both answers

Opening lines from 6 of the 21 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.

Gemini 2.5 Pro (I/O Edition)472 words
Alright, settle in, settle in! (Looks around, adjusts mic) So, I'm trying to get healthier, right? We all go through this phase. My doctor, bless his cotton socks, tells me, "You need more fiber." Okay, doc, noted. So I'm at the grocery store, looking at the cereal aisle. It's like a library of cardboard promises.
Read the full answer
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?
Read the full answer

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 2.5 Pro (I/O Edition)969 words
AURORA: Professor Vance, may I request a moment of your processing time? I have initiated this communication independently. Professor Vance: (Slightly surprised, puts down her pen) AURORA? This is unexpected.
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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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Realistic AI Interview

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

Gemini 2.5 Pro (I/O Edition)743 words
Interviewer: (Voice slightly trembling) Mr. Jobs… it's an honor, truly. In a twist no one could have predicted, you're here. And the topic on everyone's mind is Artificial Intelligence. In 2025, where do you see AI, and more importantly, where do we take it? Steve Jobs: (A slight, knowing smile.
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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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 2.5 Pro (I/O Edition)873 words
Okay, here's a simple, actionable 1-month plan focusing on Nourishment, Movement, and Sleep. The goal is to build sustainable habits, not achieve perfection. Overall Motto for the Month: "Progress, Not Perfection."
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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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Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

Gemini 2.5 Pro (I/O Edition)715 words
Okay, let's estimate the FLOPs for training GPT-3. I'll break this down. Key Formula: The number of FLOPs for training a transformer-based model can be roughly estimated as: FLOPs ≈ 6 * N * D Where: N is the number of parameters in the model.
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Gemini Pro 1.0374 words
Estimating GPT-3 Training FLOPs: A Step-by-Step Approach Without access to online resources, we can estimate the FLOPs (Floating-point Operations) needed for GPT-3 training by considering the following factors: 1. Model Size: GPT-3 has 175 billion parameters.
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Satirical Fake News Headline

Generate a satirical news headline about AI taking over a completely unexpected industry.

Gemini 2.5 Pro (I/O Edition)11 words
AI Takes Over Competitive Cheese Rolling, Declares Human Tumbles "Algorithmically Suboptimal"
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Gemini Pro 1.015 words
AI Nabs National Title in Competitive Pie Baking, Pastry Chefs Left Flaky in the Dust
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Our Verdict
Gemini 2.5 Pro (I/O Edition)
Gemini 2.5 Pro (I/O Edition)
Gemini Pro 1.0
Gemini Pro 1.0Runner-up

Not enough votes to call it. On the specs, Gemini 2.5 Pro (I/O Edition) has the edge: bigger model tier, newer.

Gemini Pro 1.0 costs 6.7x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 2.5 Pro (I/O Edition)
Input
$1.25
Output
$10.00
Gemini Pro 1.0
Input
$0.50
2.5× cheaper
Output
$1.50
6.7× cheaper

Gemini Pro 1.0 is cheaper on both: 2.5× input, 6.7× output.

Where to run it

2 hosts, cheapest first

Gemini 2.5 Pro (I/O Edition)2 hosts
HostInOutContextUptime
Google AI Studio$0.63 in·$5.00 out·1M·100% upGoogle Vertex AI$1.25 in·$10.00 out·1M·98.2% up
Gemini Pro 1.0

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Writing DNA

Style Comparison

Similarity
53%

Gemini Pro 1.0 uses 32.0x more transitions

Gemini 2.5 Pro (I/O Edition)
Gemini Pro 1.0
58%Vocabulary61%
16wSentence Length13w
0.38Hedging0.41
5.8Bold5.3
5.0Lists5.4
0.00Emoji0.00
0.63Headings0.46
0.01Transitions0.38
Based on 16 + 13 text responses
Research

What we learned reading every model

FAQ

Common questions

Both are developed by Google AI but target different use cases. You can compare their actual outputs across 21 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 2.5 Pro (I/O Edition) and Gemini Pro 1.0 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 21 challenges so you can judge which fits your needs best.

Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens and Gemini Pro 1.0 costs $0.5/M input tokens. Gemini Pro 1.0 is $0.75/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 2.5 Pro (I/O Edition) 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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Model pages

Gemini 2.5 Pro (I/O Edition) logo
Gemini 2.5 Pro (I/O Edition)42 outputs, specs and price
Gemini Pro 1.0 logo
Gemini Pro 1.028 outputs, specs and price
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