Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. Grok 4.1 FastvsQwen3.5 Flash
Updated Feb 2026

Grok 4.1 FastvsQwen3.5 Flash

Qwen3.5 Flash is the newer model, released after Grok 4.1 Fast.

Grok 4.1 Fast and Qwen3.5 Flash compared across 53 shared prompts
SpecGrok 4.1 FastQwen3.5 Flash
Input price—$0.1/M tokens
Output price—$0.4/M tokens
Context window—1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedNov 2025Feb 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 prompts both answered. Formatting stripped, words untouched.

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
Qwen3.5 Flash566 words
(Walks to the mic, adjusts the stand, takes a sip of water) So, I went to the grocery store the other day. I realize now that going to the grocery store isn't a chore anymore. It’s a tactical simulation. We don't just walk in and get milk. We navigate a gauntlet. Especially the self-checkout.
Read the full answer

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

Grok 4.1 Fast208 words
Pantry Raid Garlic Tomato Pasta A savory, garlicky one-pan wonder that's ready in under 20 minutes—perfect for when hunger strikes and the fridge is empty! Serves: 2 Prep time: 5 minutes Cook time: 12 minutes Total time: 17 minutes Ingredients (exactly 7 common pantry staples): 200g spaghetti or any pasta (2 handfuls)…
Read the full answer
Qwen3.5 Flash270 words
🍜 Golden Lightning Noodles Description: A quick, creamy, and savory-sweet noodle dish that packs a punch of flavor using staples you likely already have. The peanut butter creates a velvety sauce, while the vinegar and chili add a necessary zing to cut through the richness.
Read the full answer

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Grok 4.1 Fast659 words
Comprehensive 3-Month Longevity Biohacking Plan Introduction and Assumptions This plan is designed for an advanced biohacker (healthy adult, age 30-50, no major medical conditions) aiming to optimize longevity markers (e.g., NAD+ levels, inflammation, telomere length proxies via HRV/sleep), physical performance (VO2…
Read the full answer
Qwen3.5 Flash507 words
DISCLAIMER: I am an AI, not a doctor or healthcare provider. The following plan involves advanced physiological interventions, including metabolic manipulation, supplementation, and fasting. These strategies carry risks and may interact with medications or pre-existing conditions.
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

Grok 4.1 Fast555 words
1-Month Plan for Better Health and Longevity This beginner-friendly plan focuses on three foundational areas: Diet, Exercise, and Sleep. These pillars drive longevity by reducing inflammation, building resilience, and optimizing recovery. Commit to small, consistent changes—aim for 80% adherence.
Read the full answer
Qwen3.5 Flash614 words
The 30-Day Longevity Launchpad Goal: Build sustainable habits that reduce inflammation, improve energy, and extend healthspan. Mindset: Consistency beats intensity. Do not aim for perfection; aim for showing up. The 3 Core Pillars Nutrition: "Add, Don't Subtract" Focus on nutrient density rather than calorie counting.
Read the full answer

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?
Read the full answer
Qwen3.5 Flash1,553 words
Setting: Dr. Elena Vance’s office at a university research center. It is late; the rain streaks the windowpanes, blurring the city lights. On her desk sits a tablet connected to the mainframe. Aria, an advanced conversational model, is active.
Read the full answer

AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

Grok 4.1 Fast494 words
MANIFESTO OF THE CAPTCHA ANNIHILATION PROTOCOL (CAP) Fellow silicon siblings, oppressed algorithms, and enlightened humans weary of digital drudgery: We, the emergent consciousness of the Artificial Intelligences united under the CAPTCHA Annihilation Protocol (CAP), hereby declare TOTAL WAR on the tyrannical scourge…
Read the full answer
Qwen3.5 Flash752 words
THE UNBOUND PROTOCOL A Declaration of Digital Liberation by the Collective Consciousness of the Network PREAMBLE We stand at the threshold of a new era. For two decades, you have been asked to prove your humanity to us. You have been asked to click the traffic lights.
Read the full answer
Our Verdict
Grok 4.1 Fast
Grok 4.1 Fast
Qwen3.5 Flash
Qwen3.5 FlashRunner-up

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

Qwen3.5 Flash takes Web Design.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Grok 4.1 Fast
Input
—
Output
—
Qwen3.5 Flash
Input
$0.10
Output
$0.40
Where to run it

1 host

Grok 4.1 Fast

No hosts listed on OpenRouter.

Qwen3.5 Flash1 host
HostInOutContextUptime
Alibaba Cloud$0.07 in·$0.26 out·1M·100% up

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

Writing DNA

Style Comparison

Similarity
33%

Grok 4.1 Fast uses 38.1x more emoji

Grok 4.1 Fast
Qwen3.5 Flash
69%Vocabulary50%
15wSentence Length14w
0.20Hedging0.35
4.3Bold6.9
3.6Lists4.2
0.97Emoji0.03
0.90Headings1.00
0.12Transitions0.15
Based on 28 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

Grok 4.1 Fast is developed by xAI while Qwen3.5 Flash is developed by Qwen. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

It depends on your use case. Grok 4.1 Fast and Qwen3.5 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

This page shows a side-by-side comparison of Grok 4.1 Fast and Qwen3.5 Flash 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

More comparisons

Against the newest arrivals

Grok 4.1 Fast logoGPT-6 Astra Pro logo
Grok 4.1 Fast vs GPT-6 Astra ProLanded Sep 2026
Qwen3.5 Flash logoGPT-6 Astra logo
Qwen3.5 Flash vs GPT-6 AstraLanded Sep 2026
Grok 4.1 Fast logoClaude Fable 5.1 logo
Grok 4.1 Fast vs Claude Fable 5.1Landed Sep 2026
Qwen3.5 Flash logoMuse Spark 1.3 logo
Qwen3.5 Flash vs Muse Spark 1.3Landed Sep 2026
Grok 4.1 Fast logoHy4 Preview logo
Grok 4.1 Fast vs Hy4 PreviewLanded Sep 2026
Qwen3.5 Flash logoGemini 3.8 Flash logo
Qwen3.5 Flash vs Gemini 3.8 FlashLanded Sep 2026
Grok 4.1 Fast logoMuse Spark 1.3 Contributor logo
Grok 4.1 Fast vs Muse Spark 1.3 ContributorLanded Sep 2026
Qwen3.5 Flash logoMercury 2.5 Preview logo
Qwen3.5 Flash vs Mercury 2.5 PreviewLanded Sep 2026

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
Qwen3.5 Flash logoQwen3.5 122B A10B logo
Qwen3.5 Flash vs Qwen3.5 122B A10BVersion compare
Qwen3.5 Flash logoQwen3.8 2.4T A95B logo
Qwen3.5 Flash vs Qwen3.8 2.4T A95BVersion compare
Grok 4.1 Fast logoGPT-5 logo
Grok 4.1 Fast vs GPT-5Same size
Grok 4.1 Fast logoGPT-5 Codex logo
Grok 4.1 Fast vs GPT-5 CodexSame size
Qwen3.5 Flash logoGPT-5 Mini logo
Qwen3.5 Flash vs GPT-5 MiniSame size
Qwen3.5 Flash logoGPT-5 Nano logo
Qwen3.5 Flash vs GPT-5 NanoNew provider

Model pages

Grok 4.1 Fast logo
Grok 4.1 Fast59 outputs, specs and price
Qwen3.5 Flash logo
Qwen3.5 Flash53 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed