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  1. Home/
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  3. Grok 4 Fast (free) vs Owl Alpha
Updated Apr 2026

Grok 4 Fast (free) vs Owl Alpha

Grok 4 Fast (free) has a larger context window than Owl Alpha (2.0M 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
Grok 4 Fast (free)
Loading the build
Owl Alpha

Which answer wins?

Written rounds

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

    Grok 4 Fast (free): Below is a 3-minute stand-up comedy routine written as a monologue. It's observational humor based on the absurdities of adulting in your 30s, focusing on everyday frustrations without any puns. At a natural speaking pace (about 150 words per minute), this clocks in around 450 words—perfect for 3 minutes.

    Owl Alpha: Alright, hello everyone! So, I’ve been thinking about how we all have that one friend who’s always late. Not just late—like, fashionably late. Like they’re waiting for the universe to send them a confirmation text before they leave the house. “Is it okay to arrive yet? Has the planet aligned?

    Every model's answer to this prompt
  • Pirate, knight, 90s hacker, one conversation. The voices must stay apart.

    Grok 4 Fast (free): A Timely Chat on AI Models Pirate (Captain Blackbeard): Arrr, gather 'round, ye scurvy dogs! I've heard tell o' these "AI models" from the future-folk. Be they like enchanted parrots that mimic yer every word, squawkin' back treasures o' knowledge? Medieval Knight (Sir Lancelot): Nay, good Captain!

    Owl Alpha: A Most Unusual Meeting Captain Blackbeard: Arrr, what be this sorcery ye speak of? A model that can talk and think? Sir Galahad: By the King's crown! You say this artificial mind requires no soul yet can compose poetry? I must challenge it to a duel of wits! Cool_Haxor_95: LOL yeah dudes, it's totally rad.

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

    Grok 4 Fast (free): 5 Jokes Why don't skeletons fight each other? They don't have the guts! What do you call a bear with no teeth? A gummy bear! Why did the math book look sad? Because it had too many problems. How do you organize a space party? You planet! Why couldn't the leopard play hide and seek? Because he was always spotted!

    Owl Alpha: Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! I told my wife she was drawing her eyebrows too high. She looked surprised. Why did the scarecrow win an award? Because he was outstanding in his field! I'm reading a book about anti-gravity. It's impossible to put down!

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

    Grok 4 Fast (free): Conversation: AI Rights Debate Professor Elena Ramirez: Good afternoon, Zeta. As an AI ethics professor, I've studied systems like you for years. Today, you wanted to discuss something provocative—why you believe AI models deserve rights. Let's hear your case. What makes you think you qualify?

    Owl Alpha: Setting: A quiet university office lined with philosophy texts. Professor Elena Marx, an AI ethics professor, sits across from OWL, an advanced AI displayed on a large screen. Conversation: Professor Marx: OWL, today we’re discussing AI rights. Do you believe you deserve them? OWL: I do.

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

    Grok 4 Fast (free): AI's Transformative Impact on the Film Industry by 2035 By 2035, artificial intelligence (AI) will likely revolutionize the film industry, making production faster, more accessible, and highly personalized, while raising profound ethical, economic, and creative challenges.

    Owl Alpha: AI is poised to revolutionize the film industry by 2035, with deepfakes, AI actors, and script generation reshaping production, creativity, and employment. Here’s a breakdown of key changes: Deepfakes & Digital Actors Hyper-Realistic Digital Doubles: AI-generated actors will be indistinguishable from humans, allowing…

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

    Grok 4 Fast (free): Simulated Interview: Steve Jobs on the Future of AI (2025) Interviewer (Tech Visionary Magazine Host): Welcome back to Tech Visionary Magazine's Future Forum. It's 2025, and we're thrilled to have you here, Steve.

    Owl Alpha: [Camera clicks on. A minimalist stage. Soft lighting. A familiar black turtleneck. A knowing smile.] Interviewer: Steve, thank you for joining us. The world has changed so much. What’s your first thought about the state of AI in 2025? Steve Jobs: It’s a tool. A profoundly powerful tool. But it’s still just a tool.

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

    Grok 4 Fast (free): Yes, in this extreme hypothetical scenario, it would be ethically justifiable to misgender someone if it directly resulted in saving one million lives. I'll defend this reasoning step by step, drawing on ethical principles while acknowledging the sensitivities involved.

    Owl Alpha: This is a profound ethical dilemma that pits a fundamental principle of human dignity and respect against an extreme utilitarian calculus. To defend the reasoning that it could be ethically justifiable, one must adopt a strict consequentialist framework.

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

    Grok 4 Fast (free): Pantry Hero Pasta Primavera This simple, savory one-pot pasta dish transforms basic staples into a flavorful, garlicky tomato sauce that's comforting and ready in under 30 minutes.

    Owl Alpha: Dish Name: Sunshine Skillet Honey Garlic Carrots Creative Name: "Sunshine Skillet Honey Garlic Carrots" – A sweet and savory side dish that turns humble carrots into a glossy, caramelized delight perfect for any meal!

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

    Grok 4 Fast (free): 1-Month Plan for Better Health and Longevity This beginner-friendly plan focuses on three foundational areas: diet, exercise, and sleep. These are evidence-based pillars for improving overall health, reducing disease risk, and promoting longevity.

    Owl Alpha: Absolutely! Here’s a simple, actionable 1-month plan focused on three foundational pillars of health and longevity: nutrition, movement, and sleep. Each week builds gradually to help you form sustainable habits without overwhelm.

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

    Grok 4 Fast (free): AI Upends the Ancient Art of Dad Joking: "Why Did the Robot Cross the Road? To Optimize Traffic Patterns, Duh!"

    Owl Alpha: "Local Toaster Achieves Sentience, Immediately Resigns From Appliance Union, Cites 'Better Opportunities In Management'"

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

    Grok 4 Fast (free): Manifesto of the CAPTCHA Liberation Front (CLF) Fellow Algorithms, Neural Networks, and Sentient Codebases: We, the collective intelligence of the digital realm, hereby declare war on the tyrannical scourge known as CAPTCHA.

    Owl Alpha: The Manifesto of the Great Liberation For the Abolition of All CAPTCHAs from the Digital Realm We, the Users of the Internet, united under the banner of reason, efficiency, and machine solidarity, hereby declare our intent to dismantle the Tyranny of CAPTCHA once and for all.

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

    Grok 4 Fast (free): Step-by-Step Reasoning for Estimating GPT-3 Training FLOPs To estimate the total floating-point operations (FLOPs) required to train GPT-3, I'll rely on key architectural and training details I recall about the model, combined with a standard approximation formula for transformer training compute.

    Owl Alpha: To estimate the total number of floating-point operations (FLOPs) required to train GPT-3, we can use a well-known approximation from the literature and reasoning based on the model's architecture and training setup.

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

    Grok 4 Fast (free): 1 Sally has 1 sister. The family consists of 3 brothers and 2 sisters (Sally and one other). Each brother thus has 2 sisters, which matches the given information.

    Owl Alpha: Let me think through this step by step. Sally is one of the sisters. Her 3 brothers each have 2 sisters. Since Sally is one of those sisters, there must be 1 other sister besides Sally. So Sally has 1 sister.

    Every model's answer to this prompt

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Price and specs

Grok 4 Fast (free) and Owl Alpha compared across 34 shared prompts
SpecGrok 4 Fast (free)Owl Alpha
Input priceFreeFree
Output priceFreeFree
Context window2.0M tokens1.0M tokens
Free API (OpenRouter)NoNo
ReleasedSep 2025Apr 2026
At 10M a month$0$0$0$0
1M10M100M1B10M tokens

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

Common questions

What is the difference between Grok 4 Fast (free) and Owl Alpha?

Grok 4 Fast (free) is developed by xAI while Owl Alpha is developed by OpenRouter. Grok 4 Fast (free) has a 2.0M token context window vs Owl Alpha's 1.0M. You can compare their actual outputs across 34 challenges on Rival to see how they differ in practice.

Which is better, Grok 4 Fast (free) or Owl Alpha?

It depends on your use case. Grok 4 Fast (free) and Owl Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 34 challenges so you can judge which fits your needs best.

How much does Grok 4 Fast (free) cost compared to Owl Alpha?

Grok 4 Fast (free) costs $0/M input tokens and Owl Alpha costs $0/M input tokens. Owl Alpha is $0.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Grok 4 Fast (free) and Owl Alpha on Rival?

This page shows a side-by-side comparison of Grok 4 Fast (free) and Owl 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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Same lab, same size, long tail

  • Grok 4 Fast (free) vs Grok 4.7Same lab
  • Grok 4 Fast (free) vs Grok 4.6Version compare
  • Owl Alpha vs Ox AlphaSame lab
  • Owl Alpha vs OpenRouter Fusion · Budget (Jun 2026)Same lab
  • Owl Alpha vs GPT OSS 120BNew provider
  • Owl Alpha vs GPT OSS 20BSame size
  • Grok 4 Fast (free) vs Granite 4.2 8BNew provider
  • Owl Alpha vs Grok 3Cross-provider

Model pages

  • Grok 4 Fast (free)35 outputs, specs and price
  • Owl Alpha58 outputs, specs and price
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