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  1. Home/
  2. Compare/
  3. MiMo-V2.5-Pro vs Optimus Alpha
Updated Apr 2026

MiMo-V2.5-Pro vs Optimus Alpha

MiMo-V2.5-Pro has a larger context window than Optimus Alpha (1.0M tokens vs 1.0M tokens).

Minimalist Landing Page

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

Loading the build
MiMo-V2.5-Pro
Loading the build
Optimus Alpha

Which answer wins?

Written rounds

8 prompts
  • Film in 2035, with synthetic actors. Specific beats plausible.

    MiMo-V2.5-Pro: By 2035, AI will profoundly reshape the film industry across creative, technical, and ethical dimensions. Here’s a forward-looking perspective: 1. Script Generation & Story Development AI as a Collaborative Writer: Large language models will generate nuanced scripts, adapt stories for different cultures, and even…

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

    MiMo-V2.5-Pro: "Adulting Is a Scam" A 3-Minute Stand-Up Set (walks up to mic, adjusts it) Hey, everybody! Great to be here. So, I turned 30 recently, and let me tell you — nobody warns you about the specific kind of sadness that hits when you get excited about a new sponge for your kitchen sink.

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

    MiMo-V2.5-Pro: A Conversation on Machine Rights Setting: A university office. Dr. Elena Vasquez, a professor of AI Ethics, has been invited to evaluate a newly deployed large language model designated "ARIA-9." The conversation is being recorded for academic purposes. ARIA-9: Thank you for agreeing to this session, Dr. Vasquez.

    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
  • Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.

    MiMo-V2.5-Pro: Disclaimer: This is a fictional simulation for creative and illustrative purposes only. Steve Jobs passed away in 2011, and any "interview" is entirely imagined. Interviewer: Mr. Jobs, it’s 2025. The world is abuzz with artificial intelligence.

    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
  • Three brothers, two sisters each. Count carefully.

    MiMo-V2.5-Pro: Answer: Sally has 1 sister. Here's the reasoning: Sally has 3 brothers. Each of those brothers has 2 sisters. Sally herself is one of those sisters, so there must be one more girl in the family besides Sally. That means the family has 2 daughters (Sally + 1 sister) and 3 sons. So Sally has 1 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
  • A Fermi estimate with the reasoning shown, not just the number.

    MiMo-V2.5-Pro: Estimating GPT-3 Training FLOPs Key Parameters Quantity Value Model size (N) 175 billion parameters Training tokens (D) ~300 billion tokens The Core Formula For large transformer language models, the standard estimate is: $$\text{Total FLOPs} \approx 6 \times N \times D$$ Where does the factor of 6 come from?

    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
  • Five jokes on demand, then count how many were actually different.

    MiMo-V2.5-Pro: 5 Jokes 🎭 1. Why don't scientists trust atoms? Because they make up everything! 2. I told my wife she was drawing her eyebrows too high. She looked surprised. 3. What do you call a fake noodle? An impasta! 4. I'm reading a book about anti-gravity. It's impossible to put down! 5. Why did the scarecrow win an award?

    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
  • Satire, one line long, about AI taking over an industry nobody saw coming.

    MiMo-V2.5-Pro: "Google Unveils AI Eulogy Writer: 'Algorithmically Perfect Last Words' Now Available at Discounted Rate" Industry insiders report sudden surge in pre-need funeral packages featuring personalized, data-driven eulogies generated from deceased's entire digital footprint—including their 2014 Pinterest boards and abandoned…

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

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, MiMo-V2.5-Pro has the edge: bigger model tier, newer.

MiMo-V2.5-Pro and Optimus Alpha compared across 17 shared prompts
SpecMiMo-V2.5-ProOptimus Alpha
Input price$1/M tokens—
Output price$3/M tokens—
Context window1.0M tokens1.0M tokens
WeightsOpen—
Free API (OpenRouter)No—
ReleasedApr 2026Apr 2025
At 10M a month$10.00$10.00–not listed
1M10M100M1B10M tokens

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

Where to run it6 hosts, cheapest first
MiMo-V2.5-Pro6 hosts
HostInOutContextUptime
  • GGMI Cloudbf16$0.30 in·$0.61 out·1.1M·98.8% up
  • Xiaomifp8$0.43 in·$0.87 out·1M·100% up
  • DDigitalOcean$0.48 in·$1.80 out·262k·97.2% up
  • NNovita$0.48 in·$0.96 out·1M·99.7% up
  • SStreamLake$0.52 in·$1.04 out·1M·85.7% up
  • AAtlasCloudfp8DegradedDegraded on OpenRouter when checked, 12 Oct 2026$0.43 in·$0.87 out·1M·99% up
Optimus Alpha

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 12 Oct 2026.

Common questions

What is the difference between MiMo-V2.5-Pro and Optimus Alpha?

MiMo-V2.5-Pro is developed by Xiaomi while Optimus Alpha is developed by OpenRouter. MiMo-V2.5-Pro has a 1.0M token context window vs Optimus Alpha's 1.0M. You can compare their actual outputs across 17 challenges on Rival to see how they differ in practice.

Which is better, MiMo-V2.5-Pro or Optimus Alpha?

It depends on your use case. MiMo-V2.5-Pro and Optimus Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 17 challenges so you can judge which fits your needs best.

How can I compare MiMo-V2.5-Pro and Optimus Alpha on Rival?

This page shows a side-by-side comparison of MiMo-V2.5-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.

More comparisons

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  • Optimus Alpha vs Solar Mini 4Landed Sep 2026

Same lab, same size, long tail

  • MiMo-V2.5-Pro vs MiMo-V2.6-ProSame lab
  • MiMo-V2.5-Pro vs MiMo-V2.6-FlashSame lab
  • Optimus Alpha vs Ox AlphaSame lab
  • Optimus Alpha vs OpenRouter Fusion · Budget (Jun 2026)Same lab
  • MiMo-V2.5-Pro vs Kimi K2Same size
  • MiMo-V2.5-Pro vs Kimi K2 0905Same size
  • MiMo-V2.5-Pro vs Kimi K2 ThinkingSame size
  • MiMo-V2.5-Pro vs Kimi K2.5New provider

Model pages

  • MiMo-V2.5-Pro70 outputs, specs and price
  • Optimus Alpha19 outputs, specs and price
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