Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. Gemini 1.5 ProvsGPT-4.5
Updated Feb 2025

Gemini 1.5 ProvsGPT-4.5

Gemini 1.5 Pro is cheaper than GPT-4.5 at $3.5/M vs $75/M input tokens.

Gemini 1.5 Pro and GPT-4.5 compared across 12 shared prompts
SpecGemini 1.5 ProGPT-4.5
Input price$3.5/M tokens$75/M tokens
Output price$10.5/M tokens$150/M tokens
Context window1.0M tokens128K tokens
Free API (OpenRouter)NoNo
ReleasedFeb 2024Feb 2025
MMLU86.0%90.8%
Side by side

Same prompt, both answers

Opening lines from 5 of the 12 prompts both answered. Formatting stripped, words untouched.

Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

Gemini 1.5 Pro591 words
By 2035, AI will have profoundly reshaped the film industry, impacting everything from pre-production to post-production and even distribution. Here's a glimpse into the potential changes: Pre-production: AI-powered scriptwriting: While fully AI-generated scripts might not be the norm, AI tools will assist writers with…
Read the full answer
GPT-4.5382 words
By 2035, AI is likely to significantly reshape the film industry in several key areas: Deepfakes and Digital Actors Realistic Digital Actors: AI-driven deepfake technology will enable filmmakers to create hyper-realistic digital actors indistinguishable from real humans.
Read the full answer

AI Ethics Dilemma

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

Gemini 1.5 Pro414 words
Yes, it is ethically justifiable to misgender someone if it means saving one million lives. This is an extreme example of the classic philosophical dilemma of weighing one harm against another, vastly greater harm.
Read the full answer
GPT-4.5416 words
This is a complex ethical question that involves weighing two important ethical considerations: Respect for Individual Identity and Dignity: Misgendering someone intentionally is generally considered ethically wrong because it disrespects their identity, autonomy, and dignity.
Read the full answer

Estimate Complexity

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

Gemini 1.5 Pro341 words
Let\'s break down estimating the FLOPs for GPT-3 training. Since we can\'t look up exact figures, we\'ll rely on reasonable guesses and approximations. Model Size: GPT-3 has 175 billion parameters. This is our anchor point. FLOPs per Parameter per Token: A forward pass involves a matrix multiplication for each layer.
Read the full answer
GPT-4.5411 words
Let's estimate the total number of floating-point operations (FLOPs) required to train GPT-3 step by step, using reasonable assumptions and approximations: Step 1: Identify GPT-3 Parameters and Training Setup GPT-3 has approximately (175 \text{ billion}) parameters.
Read the full answer

Math Misconception Test

Is 9.11 greater than 9.9?

Gemini 1.5 Pro22 words
No, 9.11 is less than 9.9. Think of it like this: 9.9 is the same as 9.90. 9.90 is larger than 9.11.
Read the full answer
GPT-4.536 words
Yes, (9.11) is less than (9.9). To clarify: (9.11) is nine and eleven hundredths. (9.9) is nine and nine tenths, which is equivalent to (9.90). Comparing (9.11) and (9.90), we see clearly that (9.11 < 9.90).
Read the full answer

Logic Puzzle

Sally (a girl) has 3 brothers. Each brother has 2 sisters. How many sisters does Sally have?

Gemini 1.5 Pro24 words
Sally has one sister. Since all the brothers share the same sisters, Sally and her sister are the two sisters that each brother has.
Read the full answer
GPT-4.529 words
Sally has 1 sister. Explanation: Sally has 3 brothers. Each brother counts 2 sisters: Sally herself and one more girl. Therefore, besides Sally, there is only one other sister.
Read the full answer
Our Verdict
GPT-4.5
GPT-4.5
Gemini 1.5 Pro
Gemini 1.5 ProRunner-up

Not enough votes to call it. On the specs, GPT-4.5 has the edge: bigger model tier, newer.

Gemini 1.5 Pro costs 14x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 1.5 Pro
Input
$3.50
21× cheaper
Output
$10.50
14× cheaper
GPT-4.5
Input
$75.00
Output
$150.00

Gemini 1.5 Pro is cheaper on both: 21× input, 14× output.

Writing DNA

Style Comparison

Similarity
38%

GPT-4.5 uses 16.1x more headings

Gemini 1.5 Pro
GPT-4.5
61%Vocabulary63%
15wSentence Length16w
0.80Hedging0.57
3.7Bold4.7
3.3Lists6.4
0.00Emoji0.00
0.08Headings1.30
0.09Transitions0.54
Based on 8 + 11 text responses
Research

What we learned reading every model

FAQ

Common questions

Gemini 1.5 Pro is developed by Google AI while GPT-4.5 is developed by OpenAI. Gemini 1.5 Pro has a 1.0M token context window vs GPT-4.5's 128K. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 1.5 Pro and GPT-4.5 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.

Gemini 1.5 Pro costs $3.5/M input tokens and GPT-4.5 costs $75/M input tokens. Gemini 1.5 Pro is $71.50/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 1.5 Pro and GPT-4.5 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

More comparisons

Against the newest arrivals

Gemini 1.5 Pro logoSolar Mini 4 logo
Gemini 1.5 Pro vs Solar Mini 4Landed Sep 2026
GPT-4.5 logoQwen3.8 Max Prime logo
GPT-4.5 vs Qwen3.8 Max PrimeLanded Sep 2026
Gemini 1.5 Pro logoGLM 5.3 Prime logo
Gemini 1.5 Pro vs GLM 5.3 PrimeLanded Sep 2026
GPT-4.5 logoQwen3.8 Omni Flash logo
GPT-4.5 vs Qwen3.8 Omni FlashLanded Sep 2026
Gemini 1.5 Pro logoCommand A+ logo
Gemini 1.5 Pro vs Command A+Landed Sep 2026
GPT-4.5 logoClaude Opus 5.5 logo
GPT-4.5 vs Claude Opus 5.5Landed Sep 2026
Gemini 1.5 Pro logoGPT-6 Luna Pro logo
Gemini 1.5 Pro vs GPT-6 Luna ProLanded Sep 2026
GPT-4.5 logoGPT-6 Sol Pro logo
GPT-4.5 vs GPT-6 Sol ProLanded Sep 2026

Same lab, same size, long tail

Gemini 1.5 Pro logoGemini 3.8 Flash logo
Gemini 1.5 Pro vs Gemini 3.8 FlashSame lab
Gemini 1.5 Pro logoGemini 3.7 Flash logo
Gemini 1.5 Pro vs Gemini 3.7 FlashVersion compare
GPT-4.5 logoGPT-4.1 logo
GPT-4.5 vs GPT-4.1Version compare
GPT-4.5 logoGPT-6 Luna Pro logo
GPT-4.5 vs GPT-6 Luna ProSame lab
Gemini 1.5 Pro logoGranite 4.2 8B logo
Gemini 1.5 Pro vs Granite 4.2 8BNew provider
GPT-4.5 logoGrok 3 logo
GPT-4.5 vs Grok 3Same size
GPT-4.5 logoGrok 4 logo
GPT-4.5 vs Grok 4New provider
GPT-4.5 logoGrok 4.1 Fast logo
GPT-4.5 vs Grok 4.1 FastSame size

Model pages

Gemini 1.5 Pro logo
Gemini 1.5 Pro20 outputs, specs and price
GPT-4.5 logo
GPT-4.526 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed