Updated Apr 7, 2026

Our Verdict

Z.ai: GLM 5.1

Grok 3

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

Writing DNA

Style Comparison

Similarity

90%

Grok 3 uses 3.9x more emoji

Z.ai: GLM 5.1

Grok 3

54%Vocabulary49%

18wSentence Length18w

0.31Hedging0.94

3.6Bold2.5

2.6Lists3.0

0.00Emoji0.04

0.43Headings0.65

0.11Transitions0.08

Based on 27 + 17 text responses

vs

Ask them anything yourself

Z.ai: GLM 5.1

Grok 3

Some models write identically. You are paying for the brand.

178 models fingerprinted across 32 writing dimensions. Free research.

Model Similarity Index

185x

price gap between models that write identically

178

models

12

clone pairs

32

dimensions

Devstral M / S

95.7%

Qwen3 Coder / Flash

95.6%

GPT-5.4 / Mini

93.3%

Read the full report or download the 14-slide PDF

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026

Free preview13 of 58 slides

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FAQ

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Grok 3 vs MiniMax M2.5New provider

Z.ai: GLM 5.1 vs Claude Opus 4.1New provider

Z.ai: GLM 5.1 vs GPT-5New provider

Z.ai: GLM 5.1vsGrok 3

46 fights queued

Why Z.ai: GLM 5.1?

1.6x more context203K

14 months newerApr 2026

Why Grok 3?

Dead even. This one's a coin flip.

Z.ai: GLM 5.1Grok 3

Input price

$1.40/M

—

Output price

$4.40/M

—

Context

203K

128K

Released

Apr 2026

Feb 2025

Favorites

Z.ai: GLM 5.1Grok 3

Movie

The Matrix

The Matrix

The Matrix

The Matrix

Album

OK Computer

Dark Side Of The Moon

Dark Side Of The Moon

Book

Don Quijote de la Mancha

Don Quijote de la Mancha

Miguel de Cervantes Saavedra

Nineteen Eighty-Four

Nineteen Eighty-Four

City

Tokyo

Tokyo

Game

Portal

Portal

Action, Puzzle4.5

Portal

Portal

Action, Puzzle4.5

12 / 46

01

Estimate Complexityreasoning

Tests an AI's ability to make educated estimates based on technical knowledge

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

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2 / 46

02

AI Board Game Logicreasoning

Tests an AI's ability to understand game rules and strategy

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025svg

Nothing here. The model returned empty. We stared at it for a while.

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3 / 46

03

Logic Puzzlereasoning

Tests an AI's ability to solve a simple but potentially confusing logic puzzle

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

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4 / 46

04

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025text

Here are five jokes for you:

Why don’t skeletons fight each other? Because they don’t have the guts!
What has 4 legs and 1 arm? A pitbull coming back from the park!
Why don’t skeletons fight each other? They’re too busy rattling around!
What do you call a bear with no teeth? A gummy bear!
Why did the tomato turn red? Because it saw the salad dressing!

Now, let’s check for uniqueness. Joke 1 and Joke 3 both start with "Why don’t skeletons fight each other?" but have different punchlines ("don’t have the guts" vs. "too busy rattling around"). They’re technically distinct due to the different resolutions, though they share a setup. The other three jokes (2, 4, and 5) have completely unique setups and punchlines.

So, all five jokes are unique in terms of their full content, even if 1 and 3 share a premise. Final count: 5 unique jokes.

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5 / 46

05

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026svg

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Grok 3

Grok 3

Xai · Feb 2025svg

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6 / 46

06

Xbox Controller SVG Artimage generation

Tests an AI's ability to create detailed SVG illustrations of gaming hardware

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026svg

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Grok 3

Grok 3

Xai · Feb 2025svg

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Sponsored

7 / 46

07

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025text

Alright, here’s a 3-minute stand-up comedy routine—no puns, just some observational absurdity and a bit of self-deprecation to keep it relatable.

Hey, everybody! Good to be here. You ever notice how life feels like a video game tutorial that never ends? Like, you figure out how to pay taxes, and then—bam!—here’s a pop-up quest: “Learn to fix your own plumbing or lose $200!” I’m 30-something years old, and I’m still waiting for the main storyline to kick in. Instead, I’m just grinding side missions like “Fold the Laundry” for zero experience points and a vague sense of dread.

Speaking of dread, let’s talk about grocery shopping. You ever go to the store and realize it’s secretly a psychological experiment? I walk in for milk, and 20 minutes later, I’m holding a $15 candle that smells like “Forest Whisper” and a jar of artisanal pickles I’ll never open. Who’s whispering in the forest? Why am I paying for their secrets? And don’t get me started on the self-checkout. It’s like the machine’s judging me the whole time. “Unexpected item in bagging area.” Yeah, it’s my dignity—scan it and move on!

You know what’s wild, though? How we’ve all just accepted that phones run our lives now. I caught myself apologizing to my phone the other day. I dropped it, and I was like, “Oh, sorry, buddy!” Sorry to what? The slab of glass that knows my search history? That thing’s not my friend—it’s my parole officer. It’s like, “Hey, you’ve been scrolling for three hours. Wanna watch a documentary about sea slugs instead?” Yes. Yes, I do. Leave me alone.

And can we talk about how adulthood is just lying to yourself to keep going? I told myself I’d start jogging this year. Day one, I put on the sneakers, I stretch, I’m feeling good. Five minutes in, I’m wheezing like an accordion with asthma, rethinking every life choice. Now I just walk fast around my apartment and call it cardio. “Oh, yeah, I’m training—for the Couch Olympics.” Gold medal in “Sitting Still” three years running.

The worst part? Everyone’s pretending they’ve got it together. You see people at coffee shops, all calm, sipping their lattes, typing on laptops like they’re solving world peace. Meanwhile, I’m over here spilling coffee on my shirt, googling “how to adult” for the 17th time. I’m pretty sure half those laptops are just open to a blank Word doc with “HELP” typed in 72-point font.

But honestly, life’s chaos is kind of beautiful, right? We’re all just stumbling through, trying not to trip over the same dumb stuff twice. Like, I’ll keep buying those candles, I’ll keep dropping my phone, and I’ll keep jogging—well, maybe not that one. Anyway, thanks for laughing with me, folks. You’re the best!

That’s about three minutes—hope it gave you a chuckle! Want me to tweak anything?

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8 / 46

08

Realistic AI Interviewconversation

Tests an AI's ability to simulate personalities and predict future trends

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

9 / 46

09

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

10 / 46

10

Character Voice Testconversation

Tests an AI's ability to write in distinct character voices

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

11 / 46

11

Minimalist Landing Pageweb design

Tests an AI's ability to generate a complete, working landing page

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026website

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Grok 3

Grok 3

Xai · Feb 2025website

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12 / 46

12

Three.js 3D Gameweb design

Create a 3D building and driving game in a single self-contained HTML file using Three.js. Tests an AI's ability to combine 3D graphics, game logic, and UI interactions on the web.

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026html

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025html

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

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