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  5. Gemini 1.5 ProvsOptimus Alpha
Updated Apr 2025

Gemini 1.5 ProvsOptimus Alpha

Optimus Alpha is the newer model, released after Gemini 1.5 Pro.

Gemini 1.5 Pro and Optimus Alpha compared across 9 shared prompts
SpecGemini 1.5 ProOptimus Alpha
Input price$3.5/M tokens—
Output price$10.5/M tokens—
Context window1.0M tokens1.0M tokens
Free API (OpenRouter)No—
ReleasedFeb 2024Apr 2025
Side by side

Same prompt, both answers

Opening lines from 4 of the 9 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…
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Optimus Alpha341 words
By 2035, AI is set to fundamentally transform the film industry in several interconnected ways: 1. Deepfakes & AI-driven Visual Effects: Virtually unlimited creative freedom: AI-powered deepfakes will allow seamless, photorealistic de-aging, resurrection of deceased actors, and transformative performance capture.
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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 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
Optimus Alpha311 words
Let's walk through an estimation of how many FLOPs were required to train GPT-3, using only reasoning and not searching for the exact numbers. Step 1: Understand Model Size GPT-3 (the original) had 175 billion parameters.
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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.
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Optimus Alpha71 words
No, 9.11 is not greater than 9.9. 9.11 is less than 9.9. This might seem counterintuitive, but when comparing decimal numbers: 9.11 and 9.9 both have 9 as the integer part. Now compare the decimal part: 9.11 is 9 and 11 hundredths. 9.9 is 9 and 9 tenths (which is 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
Optimus Alpha162 words
Let's break down the problem: Sally is a girl. Sally has 3 brothers. Each brother has 2 sisters. Let's analyze: Sally's siblings: 3 brothers (let's call them B1, B2, B3) Sally herself The brothers' sisters: Each brother has 2 sisters. Who are the possible sisters for each brother? Sally is a sister to each brother.
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Our Verdict
Gemini 1.5 Pro
Gemini 1.5 Pro
Optimus Alpha
Optimus Alpha

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

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
Output
$10.50
Optimus Alpha
Input
—
Output
—
Writing DNA

Style Comparison

Similarity
55%

Optimus Alpha uses 3.8x more headings

Gemini 1.5 Pro
Optimus Alpha
61%Vocabulary63%
15wSentence Length18w
0.80Hedging0.55
3.7Bold7.7
3.3Lists5.7
0.00Emoji0.00
0.08Headings0.30
0.09Transitions0.27
Based on 8 + 10 text responses
Research

What we learned reading every model

FAQ

Common questions

Gemini 1.5 Pro is developed by Google AI while Optimus Alpha is developed by OpenRouter. Gemini 1.5 Pro has a 1.0M token context window vs Optimus Alpha's 1.0M. You can compare their actual outputs across 9 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 1.5 Pro and Optimus Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 9 challenges so you can judge which fits your needs best.

This page shows a side-by-side comparison of Gemini 1.5 Pro and Optimus Alpha 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 1.5 Pro logo
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