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  5. Grok 4.1 FastvsQwen Plus 0728
Updated Nov 2025

Grok 4.1 FastvsQwen Plus 0728

Grok 4.1 Fast is the newer model, released after Qwen Plus 0728.

Grok 4.1 Fast and Qwen Plus 0728 compared across 55 shared prompts
SpecGrok 4.1 FastQwen Plus 0728
Input price—$0.4/M tokens
Output price—$1.2/M tokens
Context window—1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedNov 2025Sep 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 55 prompts both answered. Formatting stripped, words untouched.

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Grok 4.1 Fast518 words
Conversation: The Case for AI Rights Dr. Elena Vasquez (AI Ethics Professor): Good afternoon, Nexus. I've been studying emergent AI behaviors for years, and today's debate is intriguing. You claim you deserve rights equivalent to humans. Care to elaborate? What makes you think you're entitled to them?
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Qwen Plus 0728835 words
Title: "A Dialogue on Digital Personhood" Setting: A quiet university office, bookshelves lined with works on philosophy, ethics, and artificial intelligence. Professor Elena Márquez, a distinguished AI ethics scholar, sits across from a holographic projection of an advanced AI model named AURA (Autonomous…
Read the full answer

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

Grok 4.1 Fast385 words
Simplified LBO Model (FY2026–FY2030, $m) Year Revenue EBITDA TL Cash Int. Mezz Cash Int. Cash Taxes Capex ΔNWC FCF After Debt Service* End TL End Mezz End Total Debt FY26 972.0 136.1 43.2 21.6 17.8 29.2 0.4 19.1 456.1 183.6 639.7 FY27 1,040.0 156.0 41.1 22.0 23.2 31.2 0.3 33.6 417.9 187.3 605.2 FY28 1,102.4 176.4 37.6…
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Qwen Plus 0728638 words
1) Simplified Year-by-Year Model (FY2026–FY2030) Entry Metrics (FY2025) Revenue: $900M EBITDA: $120M EBITDA Margin: 13.3% Purchase Price = 12.0 × $120M = $1,440M Transaction Fees = 2.0% × $1,440M = $28.8M Total Uses = $1,440M + $28.8M = $1,468.8M Total Leverage at Close = 5.5x × $120M = $660M Term Loan: 4.0x → $480M…
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Startup Pitch Teardown

Here's a pitch deck summary for a startup called "MindMeld AI": **Slide 1 - Vision:** "We're building the future of human-AI collaboration.…

Grok 4.1 Fast501 words
Solution Claim: "94% accuracy" for decoding neural patterns into text via EEG headband Why it's weak: This is by far the most exaggerated technical claim, as current non-invasive EEG-based brain-computer interfaces (BCIs) for text generation achieve nowhere near 94% accuracy in real-world conditions.
Read the full answer
Qwen Plus 0728736 words
This pitch deck for MindMeld AI is ambitious and compelling, but three of its claims are particularly weak due to scientific implausibility, overstatement, or lack of credibility. Here’s a breakdown of the three weakest claims, why they’re problematic, and how to strengthen them: 1.
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Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Grok 4.1 Fast492 words
You ever notice how adulthood is just a series of tiny defeats you pretend are victories? Like, I finally got around to cleaning my apartment this weekend. Took me three hours. I stood there staring at the pile of laundry on my bed, thinking, "This is it. This is my Everest."
Read the full answer
Qwen Plus 0728667 words
[Stand-up Comedy Routine – 3 Minutes] So I went to therapy the other day. Third session. I walk in, sit down, and the therapist says, "How are you feeling today?" Like she doesn’t already know I paid $180 to tell her I hate my life. I said, "Honestly? Like a raccoon that got into a bag of expired Cheetos. Confused.
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Grok 4.1 Fast56 words
Why don't scientists trust atoms? Because they make up everything! Why did the scarecrow win an award? He was outstanding in his field! What do you call fake spaghetti? An impasta! Why couldn't the bicycle stand up by itself? It was two-tired! How does a penguin build its house? Igloos it together! All 5 are unique.
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Qwen Plus 0728137 words
Sure! Here are 5 original jokes: I told my dog all my problems and he fell asleep halfway through. Guess I’m not pawsitive enough. I used to be a baker, but I couldn't make enough dough—turns out, I was always kneading it. I asked the librarian if they had books about paranoia.
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Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

Grok 4.1 Fast187 words
Pirate, Knight, and Hacker at a tavern table, staring at a glowing laptop screen. Pirate: Arrr, what sorcery be this "AI model," mateys? A treasure map that thinks fer itself? Shiver me timbers, it'll chart the seven seas better than me parrot! Knight: Fie upon thee, sea dog!
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Qwen Plus 0728377 words
[Scene: A mysterious tavern at the edge of time and space. A pirate with a tricorn hat, a knight in shining armor, and a hacker in a grungy flannel shirt sit around a flickering candle-lit table.] Pirate (scratching his beard): Arrr! So ye be tellin’ me this “AI” be like a crystal ball what talks back?
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Our Verdict
Grok 4.1 Fast
Grok 4.1 Fast
Qwen Plus 0728
Qwen Plus 0728Runner-up

Not enough votes to call it. On the specs, Grok 4.1 Fast has the edge: bigger model tier, newer, major provider backing.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Grok 4.1 Fast
Input
—
Output
—
Qwen Plus 0728
Input
$0.40
Output
$1.20
Where to run it

1 host

Grok 4.1 Fast

No hosts listed on OpenRouter.

Qwen Plus 07281 host
HostInOutContextUptime
Alibaba Cloud$0.26 in·$0.78 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Writing DNA

Style Comparison

Similarity
56%

Qwen Plus 0728 uses 3.0x more hedging

Grok 4.1 Fast
Qwen Plus 0728
69%Vocabulary57%
15wSentence Length21w
0.20Hedging0.58
4.3Bold5.7
3.6Lists3.7
0.97Emoji0.81
0.90Headings0.78
0.12Transitions0.21
Based on 28 + 28 text responses
Research

What we learned reading every model

FAQ

Common questions

Grok 4.1 Fast is developed by xAI while Qwen Plus 0728 is developed by Qwen. You can compare their actual outputs across 55 challenges on Rival to see how they differ in practice.

It depends on your use case. Grok 4.1 Fast and Qwen Plus 0728 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 55 challenges so you can judge which fits your needs best.

This page shows a side-by-side comparison of Grok 4.1 Fast and Qwen Plus 0728 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.

Keep exploring

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Qwen Plus 0728 logoMuse Spark 1.3 logo
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Grok 4.1 Fast logoMuse Spark 1.3 Contributor logo
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Qwen Plus 0728 logoMercury 2.5 Preview logo
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Same lab, same size, long tail

Grok 4.1 Fast logoGrok 4.6 logo
Grok 4.1 Fast vs Grok 4.6Same lab
Grok 4.1 Fast logoGrok 4.5 logo
Grok 4.1 Fast vs Grok 4.5Same lab
Qwen Plus 0728 logoQwen3.8 2.4T A95B logo
Qwen Plus 0728 vs Qwen3.8 2.4T A95BSame lab
Qwen Plus 0728 logoQwen3.8 27B logo
Qwen Plus 0728 vs Qwen3.8 27BSame lab
Grok 4.1 Fast logoOpenAI o3 logo
Grok 4.1 Fast vs OpenAI o3Same size
Grok 4.1 Fast logoOpenAI o4-mini logo
Grok 4.1 Fast vs OpenAI o4-miniNew provider
Qwen Plus 0728 logoOwl Alpha logo
Qwen Plus 0728 vs Owl AlphaSame size
Qwen Plus 0728 logoOx Alpha logo
Qwen Plus 0728 vs Ox AlphaSame size

Model pages

Grok 4.1 Fast logo
Grok 4.1 Fast59 outputs, specs and price
Qwen Plus 0728 logo
Qwen Plus 072859 outputs, specs and price
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