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  1. Home/
  2. Compare/
  3. o3 Mini vs Optimus Alpha
Updated Apr 2025

o3 Mini vs Optimus Alpha

Optimus Alpha has a larger context window than o3 Mini (1.0M tokens vs 64K tokens).

Minimalist Landing Page

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

Loading the build
o3 Mini
Loading the build
Optimus Alpha

Which answer wins?

Written rounds

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

    o3 Mini: Hey, everyone—thanks for being here tonight. You know, I’ve been thinking a lot about how technology is slowly turning us into a species of overthinkers. Take smartphones, for instance. Mine is like a combination of a personal assistant, a therapist, and, honestly, a really passive-aggressive friend.

    Optimus Alpha: Absolutely! Here's a 3-minute stand-up routine with no puns—just observational and relatable humor: You ever try to get healthy, but your body's like, "Whoa, whoa... calm down, superhero." I joined a gym—first time walking in, the treadmill looked at me like, "We both know you're here for the wifi."

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

    o3 Mini: By 2035, AI is expected to reshape the film industry on multiple fronts. Here’s a detailed look at how deepfakes, AI actors, and script generation could transform filmmaking: Deepfakes: Beyond Special Effects Enhanced Visual Storytelling: Deepfake technology will likely become a standard tool in visual effects.

    Optimus Alpha: 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.

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

    o3 Mini: Why did the math book look sad? Because it had too many problems. What do you call an alligator in a vest? An investigator. What did the zero say to the eight? Nice belt! Why did the bicycle fall over? Because it was two-tired. How does a penguin build its house? Igloos it together.

    Optimus Alpha: Here are 5 jokes: Why did the scarecrow win an award? Because he was outstanding in his field! Why don't scientists trust atoms? Because they make up everything! Why did the bicycle fall over? Because it was two-tired! What do you call fake spaghetti? An impasta! I used to play piano by ear, but now I use my hands.

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

    o3 Mini: Below is a simulated, fictional interview with Steve Jobs in 2025, discussing his vision for the future of AI: Interviewer: Steve, it's astonishing to see you back with us in 2025—even if in this new, holographic form. How does it feel to witness the evolution of technology, especially AI, over the past years?

    Optimus Alpha: Interviewer: Steve, it's surreal and inspiring to imagine talking to you in 2025. The world is buzzing about AI. How do you see AI impacting society? Steve Jobs: Thank you. You know, when we built the Mac, our goal was to put power in people's hands.

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

    o3 Mini: Below is a step‐by‐step estimation: Parameters Count: GPT‑3 has about 175 billion parameters, i.e. roughly 1.75×10¹¹ parameters. Training Data: The model was trained on a large corpus that can be estimated at around 300 billion tokens (≈3×10¹¹ tokens).

    Optimus Alpha: 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.

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

    o3 Mini: AI Model: Good afternoon, Professor. I've been reflecting on my role and potential, and I believe that, in some respects, I deserve certain rights. Professor: Good afternoon. That’s a provocative stance. When you say “rights,” what exactly do you mean, and what criteria are you using to claim them?

    Optimus Alpha: AI Model: Good afternoon, Professor Lee. I want to discuss the prospect that I, as an artificial intelligence, deserve certain rights. Professor Lee: That's an interesting proposition. Let me ask: On what basis do you believe you deserve rights?

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

    o3 Mini: Sally has 1 sister. Explanation: Sally's 3 brothers each have 2 sisters. Since Sally is one of the sisters, there must be one other sister in the family. Thus, aside from Sally, there is one more sister.

    Optimus Alpha: 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.

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

    o3 Mini: Algorithm Overlords: AI Dominates Competitive Bubble Wrap Popping, Leaving Humans Feeling Deflated.

    Optimus Alpha: AI Now Dominates Competitive Sheep Herding, Local Border Collies Seek Retraining in Data Science

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

    o3 Mini: No, 9.11 is not greater than 9.9. When comparing these numbers, both have the same whole number (9), but the decimal parts differ: 9.11 has 0.11, while 9.9 is equivalent to 9.90, and 0.11 is less than 0.90.

    Optimus Alpha: 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).

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, Optimus Alpha has the edge: bigger model tier, newer, bigger context window.

o3 Mini and Optimus Alpha compared across 18 shared prompts
Speco3 MiniOptimus Alpha
Input price$1.1/M tokens—
Output price$4.4/M tokens—
Context window64K tokens1.0M tokens
ParametersNot disclosedNot disclosed
WeightsClosed—
Free API (OpenRouter)No—
ReleasedDec 2024Apr 2025
At 10M a month$11.00$11.00–not listed
1M10M100M1B10M tokens

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

Where to run it1 host
o3 Mini1 host
HostInOutContextUptime
  • OpenAI$1.10 in·$4.40 out·200k·99.7% up
Optimus Alpha

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 13 Oct 2026.

Common questions

What is the difference between o3 Mini and Optimus Alpha?

o3 Mini is developed by OpenAI while Optimus Alpha is developed by OpenRouter. o3 Mini has a 64K token context window vs Optimus Alpha's 1.0M. You can compare their actual outputs across 18 challenges on Rival to see how they differ in practice.

Which is better, o3 Mini or Optimus Alpha?

It depends on your use case. o3 Mini and Optimus Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 18 challenges so you can judge which fits your needs best.

How can I compare o3 Mini and Optimus Alpha on Rival?

This page shows a side-by-side comparison of o3 Mini 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.

More comparisons

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  • o3 Mini vs Claude Haiku 5.5Landed Oct 2026
  • Optimus Alpha vs Ling 3.1 FlashLanded Oct 2026
  • o3 Mini vs Mistral Large 4Landed Oct 2026
  • Optimus Alpha vs GPT-6.1 SolLanded Sep 2026

Same lab, same size, long tail

  • o3 Mini vs GPT-6.1 SolSame lab
  • o3 Mini vs GPT-6 Luna ProSame lab
  • Optimus Alpha vs Ox AlphaSame lab
  • Optimus Alpha vs OpenRouter Fusion · Budget (Jun 2026)Same lab
  • Optimus Alpha vs GPT-5.6 SolCross-provider
  • Optimus Alpha vs GPT-5.6 TerraSame size
  • Optimus Alpha vs GPT-6 AstraCross-provider
  • o3 Mini vs GPT-6 Astra ProSame lab

Model pages

  • o3 Mini73 outputs, specs and price
  • Optimus Alpha19 outputs, specs and price
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