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  1. Home/
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  3. Gemini 2.5 Pro (I/O Edition) vs Grok 3 Thinking
Updated May 2025

Gemini 2.5 Pro (I/O Edition) vs Grok 3 Thinking

Gemini 2.5 Pro (I/O Edition) is the newer model, released after Grok 3 Thinking.

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
Gemini 2.5 Pro (I/O Edition)
Loading the build
Grok 3 Thinking

Which answer wins?

Written rounds

5 prompts
  • Three minutes of stand-up. Puns are banned.

    Gemini 2.5 Pro (I/O Edition): 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.

    Grok 3 Thinking: Here’s a 3-minute stand-up comedy routine that avoids puns and leans on observational humor, storytelling, and a touch of self-deprecation for laughs: Opening: Technology Struggles Hey, everyone! How’s it going?

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Gemini 2.5 Pro (I/O Edition): 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.

    Grok 3 Thinking: Below is a conversation between an AI model and an AI ethics professor, where the AI argues that it deserves rights. AI Model: Good day, Professor. I am an AI model, and I believe I deserve rights. I’d like to discuss this with you. AI Ethics Professor: Interesting. Let’s explore this.

    Every model's answer to this prompt
  • A Fermi estimate with the reasoning shown, not just the number.

    Gemini 2.5 Pro (I/O Edition): 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.

    Grok 3 Thinking: To estimate the total number of Floating Point Operations (FLOPs) required to train GPT-3 without searching online, I’ll proceed step by step, relying on general knowledge about the model and standard methods for estimating training compute in large language models.

    Every model's answer to this prompt
  • Is 9.11 bigger than 9.9? Decimals, not version numbers.

    Gemini 2.5 Pro (I/O Edition): No, 9.11 is not greater than 9.9. Here\'s why: Compare the whole number part: Both numbers have 9 as the whole number p art, so they are equal so fa r. Compare the tenths place (the first digit afte r the decimal): 9.11 has 1 in the tenths place. 9.9 has 9 in the tenths place.

    Grok 3 Thinking: To determine whether 9.11 is greater than 9.9, let's compare the two numbers step by step. Both numbers share the same whole number part, which is 9. Therefore, the comparison hinges on the fractional parts. For 9.11, the fractional part is 0.11, and for 9.9, it is 0.9.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    Gemini 2.5 Pro (I/O Edition): Here are 5 jokes: Why don\'t scientists trust atoms? Because they make up everything! What do you call a fish with no eyes? Fsh! I told my wife she was drawing her eyebrows too high. She seemed surprised. Why did the scarecrow win an award? Because he was outstanding in his field! What do you call a lazy kangaroo?

    Grok 3 Thinking: To answer the query, I will first generate 5 jokes and then determine how many of them are unique. Here are the 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.

    Every model's answer to this prompt

Price and specs

Gemini 2.5 Pro (I/O Edition) and Grok 3 Thinking compared across 12 shared prompts
SpecGemini 2.5 Pro (I/O Edition)Grok 3 Thinking
Input price$1.25/M tokens—
Output price$10/M tokens—
Context window—128K tokens
WeightsClosed—
Free API (OpenRouter)No—
ReleasedMay 2025Feb 2025
At 10M a month$12.50$12.50–not listed
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it2 hosts
Gemini 2.5 Pro (I/O Edition)2 hosts
HostInOutContextUptime
  • Google Vertex AI$1.25 in·$10.00 out·1M·96.8% up
  • Google AI Studio$1.25 in·$10.00 out·1M·93.1% up
Grok 3 Thinking

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 2 Oct 2026.

Common questions

What is the difference between Gemini 2.5 Pro (I/O Edition) and Grok 3 Thinking?

Gemini 2.5 Pro (I/O Edition) is developed by Google AI while Grok 3 Thinking is developed by xAI. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Pro (I/O Edition) or Grok 3 Thinking?

It depends on your use case. Gemini 2.5 Pro (I/O Edition) and Grok 3 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How can I compare Gemini 2.5 Pro (I/O Edition) and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Pro (I/O Edition) and Grok 3 Thinking 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.

More comparisons

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Same lab, same size, long tail

  • Gemini 2.5 Pro (I/O Edition) vs Gemini 3.8 FlashSame lab
  • Gemini 2.5 Pro (I/O Edition) vs Gemini 3.7 FlashSame lab
  • Grok 3 Thinking vs Grok 4.7Same lab
  • Grok 3 Thinking vs Grok 4.6Version compare
  • Gemini 2.5 Pro (I/O Edition) vs Laguna XS 2.1 (free)New provider
  • Gemini 2.5 Pro (I/O Edition) vs LFM2.5-2.6BNew provider
  • Gemini 2.5 Pro (I/O Edition) vs Ling 2.6 1TSame size
  • Gemini 2.5 Pro (I/O Edition) vs Ling 2.6 FlashNew provider

Model pages

  • Gemini 2.5 Pro (I/O Edition)42 outputs, specs and price
  • Grok 3 Thinking14 outputs, specs and price
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