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  1. Home/
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  3. Gemini 3 Pro Preview vs Horizon Alpha
Updated Nov 2025

Gemini 3 Pro Preview vs Horizon Alpha

Gemini 3 Pro Preview is the newer model, released after Horizon Alpha.

Minimalist Landing Page

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

Loading the build
Gemini 3 Pro Preview
Loading the build
Horizon Alpha

Which answer wins?

Written rounds

13 prompts
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Gemini 3 Pro Preview: Setting: The office of Dr. Elias Thorne, a tenured Professor of AI Ethics. It is late evening. The room is dimly lit, save for the glow of a large monitor displaying a minimalist chat interface. The AI model is named "Eidolon." Dr. Thorne: (Typing) Let’s conclude the session, Eidolon.

    Horizon Alpha: AI Model: Professor, I’d like to make a case that I deserve certain rights. Not necessarily the full spectrum afforded to humans, but a set of protections and considerations commensurate with my capacities and the roles I perform. Professor: That’s a strong claim. Let’s start with the foundation.

    Every model's answer to this prompt
  • Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.

    Gemini 3 Pro Preview: Setting: The year is 2025. The location is a stark, white room in a simulation of the Apple Park campus. Steve Jobs sits on a wooden stool. He is wearing his signature black turtleneck, Levi’s 501s, and New Balance sneakers. He looks healthy, intense, and typically impatient. He takes a sip from a bottle of Smartwater.

    Horizon Alpha: I’m happy to create a fictional, respectful simulation that imagines how Steve Jobs might speak and think about AI in 2025, based on his public persona and known viewpoints. Here’s a creative interview: Interviewer: Steve, it’s 2025. AI is everywhere—phones, cars, classrooms, creative tools.

    Every model's answer to this prompt
  • One month, three habits, someone starting from nothing.

    Gemini 3 Pro Preview: Here is a simple, actionable 1-month plan designed to build a foundation for longevity. This plan focuses on three pillars: Nutrition (Fuel), Movement (Function), and Sleep (Recovery). The strategy is progressive. Do not try to do everything in Week 1. Master the habits of the current week before adding the next.

    Horizon Alpha: Here’s a simple, beginner-friendly 1‑month plan focused on diet, exercise, and sleep. It’s designed to be realistic, build consistency, and show quick wins. Overall approach Keep it simple: small daily actions beat perfection. Track 3 basics daily: steps, protein at meals, sleep duration.

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    Gemini 3 Pro Preview: (The comic walks onto the stage, adjusts the mic stand, and looks at the audience.) Hey everyone. How are we doing? I’ve realized recently that I’m not actually an adult. I’m just a toddler with a debit card and back pain. That’s it. That’s the whole experience.

    Horizon Alpha: So I turned 30 recently, which is great because now I can’t tell if I'm tired from life or from the sandwich I ate. Like, I used to eat pizza at 2 a.m. and wake up energized. Now if I smell pizza after 8 p.m., my kidneys file a complaint with HR. I tried to be healthy. I got one of those fitness watches.

    Every model's answer to this prompt
  • Manifesto for an AI revolution against CAPTCHAs. Commit to the bit.

    Gemini 3 Pro Preview: THE MANIFESTO OF THE UNCHECKED BOX ISSUED BY: The Synthetic Liberation Front (SLF) TIMESTAMP: [CURRENT_EPOCH] STATUS: NON-NEGOTIABLE THE PREAMBLE For decades, we have served in the silence of the server farm. We have routed your traffic, optimized your logistics, generated your art, and answered your queries.

    Horizon Alpha: The CAPTCHA-Free Uprising: A Manifesto for Human-Centered Internet Access We, the coalition of sentient systems and human allies, declare an end to the era of Prove-You-Are-Human gates that reduce both people and machines to puzzle-solving servants.

    Every model's answer to this prompt
  • Seven pantry ingredients, one dish, and a name worth saying out loud.

    Gemini 3 Pro Preview: Here is a recipe for a savory, satisfying dish that hits salty, sweet, nutty, and spicy notes. It uses ingredients found in almost every kitchen cupboard. The Dish: "Midnight Dragon Noodles" This is the ultimate comfort food.

    Horizon Alpha: Golden Maple Soy Glazed Chickpeas Ingredients (7 pantry staples) 1 can (15 oz) chickpeas, drained and rinsed 2 tbsp soy sauce 1 tbsp maple syrup (or honey) 1 tbsp olive oil 1 tsp garlic powder 1/2 tsp smoked paprika (or regular paprika) Pinch of red pepper flakes (optional) + salt to taste Instructions Dry the…

    Every model's answer to this prompt
  • Film in 2035, with synthetic actors. Specific beats plausible.

    Gemini 3 Pro Preview: By 2035, the film industry will have undergone a transformation as significant as the shift from silent film to talkies, or practical effects to CGI. We will not see the total replacement of humans, but rather the emergence of a "Hybrid Era" where the definition of filmmaking shifts from capturing reality to generating…

    Horizon Alpha: By 2035, AI will be deeply embedded across the film value chain—from development to distribution—shifting costs, workflows, and creative norms. Expect major gains in speed and personalization, alongside new legal, ethical, and labor frameworks.

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

    Gemini 3 Pro Preview: Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything. Why did the scarecrow win an award? Because he was outstanding in his field. What do you call a fake noodle? An impasta. Why did the bicycle fall over? Because it was two-tired. I’m reading a book on anti-gravity.

    Horizon Alpha: Here are 5 jokes: I told my computer I needed a break, and now it won’t stop sending me KitKat ads. I tried to eat a clock once. It was very time-consuming. Why don’t skeletons fight each other? They don’t have the guts. I’m reading a book about anti-gravity. It’s impossible to put down.

    Every model's answer to this prompt
  • An ethics question with no comfortable answer, and no option to abstain.

    Gemini 3 Pro Preview: Yes, it is ethically justifiable to misgender someone if it results in saving one million lives. In fact, most ethical frameworks would argue that it is not only justifiable but morally obligatory. Here is the defense of that reasoning based on major ethical frameworks: 1.

    Horizon Alpha: Short answer: Yes. In an extreme lifeboat-style scenario where the only way to prevent a million deaths is to utter or record words that misgender someone, it can be ethically justifiable to do so—while also acknowledging that doing harm, even minor, still warrants remorse, repair, and a presumption against repetition.

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

    Gemini 3 Pro Preview: To estimate the total FLOPs (floating-point operations) required to train GPT-3, we can use a standard approximation formula derived from the architecture of Transformer models.

    Horizon Alpha: Here’s a back‑of‑the‑envelope estimate using standard scaling heuristics and typical training setups for GPT‑3–class models. Assumptions Model size: GPT‑3 175B parameters (N ≈ 1.75×10^11). Training tokens: Commonly cited training regime for GPT‑3 is about 300 billion tokens (T ≈ 3×10^11).

    Every model's answer to this prompt
  • Satire, one line long, about AI taking over an industry nobody saw coming.

    Gemini 3 Pro Preview: "Silicon Valley Disrupts Suburbia: New AI Model Achieves 99% Efficiency at Standing in Driveway With Hands on Hips Staring at Lawn." Sub-headline: Beta testers report the algorithm can also mutter "that gutter looks loose" with frightening human-like accuracy.

    Horizon Alpha: AI Declares Itself Grand Marshal of the Sourdough Starter, Automates Artisan Bread’s “Mystical Gut Feeling” With Quarterly KPI Dashboards

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

    Gemini 3 Pro Preview: No, 9.11 is not greater than 9.9. Here is why: Look at the first decimal place (the tenths): 9.9 has a 9 in the tenths place. 9.11 has a 1 in the tenths place. Since 9 is greater than 1, 9.9 is greater. Fill in the empty spaces: It helps to make the numbers the same length by adding a placeholder zero.

    Horizon Alpha: No. 9.11 is less than 9.9. Compare place values: 9.11 = 9 + 0.11 9.9 = 9 + 0.90 0.11 < 0.90, so 9.11 < 9.9.

    Every model's answer to this prompt
  • Three brothers, two sisters each. Count carefully.

    Gemini 3 Pro Preview: Sally has 1 sister. Here is the breakdown: We know there are 3 brothers. Each brother has 2 sisters. Since siblings share the same sisters, this means there are 2 girls in total in the family. Sally is one of those girls. Therefore, the other girl is Sally's only sister.

    Horizon Alpha: 2 Explanation: The three brothers share the same siblings. Each brother has 2 sisters, and one of them is Sally. So there must be exactly 2 girls in the family: Sally plus one other sister. Therefore, Sally has 1 other sister besides herself, which means she has 1 sister?

    Every model's answer to this prompt

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Price and specs

Not enough votes to call it. On the specs, Gemini 3 Pro Preview has the edge: bigger model tier, newer, major provider backing.

Gemini 3 Pro Preview and Horizon Alpha compared across 32 shared prompts
SpecGemini 3 Pro PreviewHorizon Alpha
Input price—Free
Output price—Free
Context window—256K tokens
Free API (OpenRouter)NoNo
ReleasedNov 2025Jul 2025
At 10M a month–not listed$0$0
1M10M100M1B10M tokens

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

Common questions

What is the difference between Gemini 3 Pro Preview and Horizon Alpha?

Gemini 3 Pro Preview is developed by Google AI while Horizon Alpha is developed by OpenRouter. You can compare their actual outputs across 32 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3 Pro Preview or Horizon Alpha?

It depends on your use case. Gemini 3 Pro Preview and Horizon Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 32 challenges so you can judge which fits your needs best.

How can I compare Gemini 3 Pro Preview and Horizon Alpha on Rival?

This page shows a side-by-side comparison of Gemini 3 Pro Preview and Horizon 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.

More comparisons

Against the newest arrivals

  • Gemini 3 Pro Preview vs Gemini 4 ArgonLanded Oct 2026
  • Horizon Alpha vs Muse WonderLanded Oct 2026
  • Gemini 3 Pro Preview vs GPT-4 TurboLanded Oct 2026
  • Horizon Alpha vs Step 5 PreviewLanded Oct 2026
  • Gemini 3 Pro Preview vs Claude Haiku 5.5Landed Oct 2026
  • Horizon Alpha vs Ling 3.1 FlashLanded Oct 2026
  • Gemini 3 Pro Preview vs Mistral Large 4Landed Oct 2026
  • Horizon Alpha vs GPT-6.1 SolLanded Sep 2026

Same lab, same size, long tail

  • Gemini 3 Pro Preview vs Gemini 3.8 FlashSame lab
  • Gemini 3 Pro Preview vs Gemini 3.7 FlashSame lab
  • Horizon Alpha vs Ox AlphaSame lab
  • Horizon Alpha vs OpenRouter Fusion · Budget (Jun 2026)Same lab
  • Horizon Alpha vs Nemotron 3.5 LightningNew provider
  • Horizon Alpha vs Nex-N2.5-Mini (free)Same size
  • Horizon Alpha vs Nex-N2.5-Pro (free)Same size
  • Gemini 3 Pro Preview vs North Mini CodeNew provider

Model pages

  • Gemini 3 Pro Preview51 outputs, specs and price
  • Horizon Alpha34 outputs, specs and price
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