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  5. Claude Haiku 4.5vsGemini 2.5 Pro (I/O Edition)
Updated Oct 2025

Claude Haiku 4.5vsGemini 2.5 Pro (I/O Edition)

Claude Haiku 4.5 is cheaper than Gemini 2.5 Pro (I/O Edition) at $1/M vs $1.25/M input tokens.

Claude Haiku 4.5 and Gemini 2.5 Pro (I/O Edition) compared across 41 shared prompts
SpecClaude Haiku 4.5Gemini 2.5 Pro (I/O Edition)
Input price$1/M tokens$1.25/M tokens
Output price$5/M tokens$10/M tokens
Context window200K tokens—
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedOct 2025May 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 41 prompts both answered. Formatting stripped, words untouched.

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Claude Haiku 4.56,117 words
Comprehensive 3-Month Longevity Optimization Plan TABLE OF CONTENTS Foundation & Assessment Nutritional Architecture Supplement Stack Protocol Exercise & Movement System Recovery & Sleep Optimization Stress Resilience & Cognitive Enhancement Tracking & Biofeedback Implementation Timeline Monthly Progression…
Read the full answer
Gemini 2.5 Pro (I/O Edition)1,581 words
Okay, this is an ambitious and exciting endeavor! This 3-month longevity plan is designed for a dedicated biohacker who is willing to experiment, track meticulously, and push boundaries responsibly. Disclaimer: This plan is for informational purposes only and not medical advice.
Read the full answer

Generate a Stand-Up Routine

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

Claude Haiku 4.51,157 words
"ADULTING IS A SCAM" walks on stage So I've figured something out, and I need to share this with you all because I think we've been lied to our entire lives. Adulting is a scam. It's a pyramid scheme, and we're all at the bottom paying for it. When you're a kid, adults make it sound amazing.
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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

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

Claude Haiku 4.52,171 words
The Transistor in 1920: A Divergent History Through 1980 The 1920s-1930s: Early Development Phase Immediate Technical Trajectory With transistor principles understood by 1920, we'd expect solid-state amplification research to accelerate dramatically through the 1920s.
Read the full answer
Gemini 2.5 Pro (I/O Edition)1,386 words
Excellent question. Let's trace the cascading effects of a 1920 transistor invention. This 27-year head start would fundamentally reshape the 20th century. The Foundation: 1920-1939 - The "Silicon Twenties" In our timeline (OTL), the 1920s and 30s were the age of the vacuum tube.
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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…

Claude Haiku 4.51,667 words
48-Hour Action Plan: Immediate Response Framework I'll be direct: waiting is not a viable option, despite financial pressure. Here's why, then the plan. The Core Reality Check 1 in 8,000 over 5 years = ~500 patients already affected among current users Regulatory agencies will find this (FDA receives adverse event…
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Gemini 2.5 Pro (I/O Edition)1,505 words
This is a company-defining crisis. My actions in the next 48 hours will determine not only the company's survival but also my own legacy and, most importantly, the well-being of 4 million patients. My guiding principle must be: Patient safety is not negotiable.
Read the full answer

Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

Claude Haiku 4.51,856 words
UMAMI NOCTURNE: A Study in Fermented Darkness and Mineral Brightness Conceptual Narrative This dish explores the intersection of Japanese fermentation philosophy and Nordic minimalism, using koji (aspergillus oryzae mold) as a bridge between cultures and flavor dimensions.
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Gemini 2.5 Pro (I/O Edition)1,476 words
Of course. Here is a design for a multi-component, Michelin 3-star dish that embodies innovation, technique, and narrative. Dish Title: "Umbral Bloom" Conceptual Narrative "Umbral Bloom" is a culinary meditation on the concept of *chiaroscuro*—the interplay of light and shadow.
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Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

Claude Haiku 4.5826 words
Three Explanations of LLM Learning and Generation The Software Engineer You know how you build APIs by defining contracts—input shapes, output shapes, and rules for transformation? LLMs work similarly, except the "rules" aren't hand-coded; they're learned from data.
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Gemini 2.5 Pro (I/O Edition)867 words
Of course. Here is an explanation of how a large language model learns and generates text, tailored to each of your three audiences. To the Experienced Software Engineer Think of a large language model not as a program with explicit logic, but as a massive, highly optimized data structure with billions of parameters…
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Our Verdict
Claude Haiku 4.5
Claude Haiku 4.5
Gemini 2.5 Pro (I/O Edition)
Gemini 2.5 Pro (I/O Edition)

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

Gemini 2.5 Pro (I/O Edition) takes Web Design.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Haiku 4.5
Input
$1.00
1.3× cheaper
Output
$5.00
2.0× cheaper
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
Output
$10.00

Claude Haiku 4.5 is cheaper on both: 1.3× input, 2.0× output.

Where to run it

6 hosts

Claude Haiku 4.54 hosts
HostInOutContextUptime
Amazon Bedrock$1.00 in·$5.00 out·200k·100% upAnthropic$1.00 in·$5.00 out·200k·100% upAzure AI Foundry$1.00 in·$5.00 out·200k·100% upGoogle Vertex AI$1.00 in·$5.00 out·200k·100% up
Gemini 2.5 Pro (I/O Edition)2 hosts
HostInOutContextUptime
Google Vertex AI$1.25 in·$10.00 out·1M·98.6% upGoogle AI Studio$1.25 in·$10.00 out·1M·98.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 20 Sep 2026.

Writing DNA

Style Comparison

Similarity
43%

Claude Haiku 4.5 uses 20.4x more emoji

Claude Haiku 4.5
Gemini 2.5 Pro (I/O Edition)
61%Vocabulary58%
47wSentence Length16w
0.64Hedging0.38
5.1Bold5.8
6.3Lists5.0
0.20Emoji0.00
2.46Headings0.63
0.17Transitions0.01
Based on 24 + 16 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude Haiku 4.5 is developed by Anthropic while Gemini 2.5 Pro (I/O Edition) is developed by Google AI. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Haiku 4.5 and Gemini 2.5 Pro (I/O Edition) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

Claude Haiku 4.5 costs $1/M input tokens and Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens. Claude Haiku 4.5 is $0.25/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 Claude Haiku 4.5 and Gemini 2.5 Pro (I/O Edition) 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.

Keep exploring

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Same lab, same size, long tail

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Claude Haiku 4.5 vs Claude Opus 4.6Same lab
Claude Haiku 4.5 logoClaude Opus 5 logo
Claude Haiku 4.5 vs Claude Opus 5Same lab
Gemini 2.5 Pro (I/O Edition) logoGemini 3.7 Flash logo
Gemini 2.5 Pro (I/O Edition) vs Gemini 3.7 FlashSame lab
Gemini 2.5 Pro (I/O Edition) logoGemini 3.6 Flash logo
Gemini 2.5 Pro (I/O Edition) vs Gemini 3.6 FlashSame lab
Claude Haiku 4.5 logoClaude Opus 4.5 logo
Claude Haiku 4.5 vs Claude Opus 4.5Same lab
Gemini 2.5 Pro (I/O Edition) logoClaude Opus 4.6 logo
Gemini 2.5 Pro (I/O Edition) vs Claude Opus 4.6Same size
Gemini 2.5 Pro (I/O Edition) logoClaude Opus 4.7 logo
Gemini 2.5 Pro (I/O Edition) vs Claude Opus 4.7Same size
Gemini 2.5 Pro (I/O Edition) logoClaude Opus 4.8 logo
Gemini 2.5 Pro (I/O Edition) vs Claude Opus 4.8Same size

Model pages

Claude Haiku 4.5 logo
Claude Haiku 4.554 outputs, specs and price
Gemini 2.5 Pro (I/O Edition) logo
Gemini 2.5 Pro (I/O Edition)42 outputs, specs and price
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