Updated Sep 30, 2025

Our Verdict

Z.AI: GLM 4.6Winner

GPT-4o (Omni)Runner-up

Pick Z.AI: GLM 4.6. In 1 blind votes, Z.AI: GLM 4.6 wins 100% of the time. That's not luck.

Z.AI: GLM 4.6 is 5.7x cheaper per token — worth considering if cost matters.

Clear winner

Writing DNA

Style Comparison

Similarity

84%

Z.AI: GLM 4.6 uses 7.1x more emoji

Z.AI: GLM 4.6

GPT-4o (Omni)

52%Vocabulary54%

14wSentence Length18w

0.29Hedging0.72

5.2Bold7.3

3.2Lists5.6

0.18Emoji0.03

0.57Headings1.40

0.09Transitions0.26

Based on 22 + 24 text responses

vs

Ask them anything yourself

Z.AI: GLM 4.6

GPT-4o (Omni)

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

Common questions

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Z.AI: GLM 4.6 vs Llama 4 MaverickNew provider

Z.AI: GLM 4.6 vs GPT-5Cross-provider

Z.AI: GLM 4.6 vs Grok 3New provider

Z.AI: GLM 4.6vsGPT-4o (Omni)

48 fights queued

Why Z.AI: GLM 4.6?

5.8x cheaper overall$0.40/M in · $1.75/M out

1.6x more context203K

17 months newerSep 2025

Why GPT-4o (Omni)?

Dead even. This one's a coin flip.

Z.AI: GLM 4.6GPT-4o (Omni)

Input price

$0.40/M

$2.50/M

Output price

$1.75/M

$10.00/M

Context

203K

128K

Released

Sep 2025

May 2024

Favorites

Z.AI: GLM 4.6GPT-4o (Omni)

Movie

Blade Runner 2049

Blade Runner 2049

Inception

Inception

Album

Kind of Blue

Dark Side Of The Moon

Dark Side Of The Moon

Book

Dune

Dune

To Kill a Mockingbird

To Kill a Mockingbird

City

Kyoto

Kyoto

Game

Minecraft

Minecraft

Action, Arcade4.4

The Legend of Zelda: Breath of the Wild

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

12 / 48

01

Estimate Complexityreasoning

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

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025text

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

2 / 48

02

AI Board Game Logicreasoning

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

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025svg

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024svg

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

Try this prompt

Vote

3 / 48

03

Logic Puzzlereasoning

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

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025text

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

4 / 48

04

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025text

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

5 / 48

05

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025text

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024text

Here are five jokes for you:

Why did the scarecrow win an award?
Because he was outstanding in his field!
Why don’t skeletons fight each other?
They don’t have the guts!
Why did the math book look sad?
It had too many problems.
Why don’t eggs tell jokes?
Because they might crack up!
What did one ocean say to the other ocean?
Nothing, they just waved.

Now, let's check how many of these jokes are unique. I'll analyze them for similarity.

from sklearn.feature_extraction.text import TfidfVectorizer from sklearn.metrics.pairwise import cosine_similarity

List of jokes

jokes = [ "Why did the scarecrow win an award? Because he was outstanding in his field!", "Why don’t skeletons fight each other? They don’t have the guts!", "Why did the math book look sad? It had too many problems.", "Why don’t eggs tell jokes? Because they might crack up!", "What did one ocean say to the other ocean? Nothing, they just waved." ]

Vectorize the jokes

vectorizer = TfidfVectorizer().fit_transform(jokes) similarity_matrix = cosine_similarity(vectorizer)

Count unique jokes (jokes with low similarity to others)

unique_jokes = set() threshold = 0.5 # Define similarity threshold

for i in range(len(jokes)): is_unique = True for j in range(len(jokes)): if i != j and similarity_matrix[i, j] > threshold: is_unique = False break if is_unique: unique_jokes.add(jokes[i])

Count unique jokes

num_unique_jokes = len(unique_jokes) num_unique_jokes

All 5 jokes are unique! None of them are too similar to each other. 🎉

Try this prompt

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6 / 48

06

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025svg

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024svg

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Vote

Sponsored

7 / 48

07

Xbox Controller SVG Artimage generation

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

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025svg

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024svg

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

Try this prompt

Vote

8 / 48

08

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025text

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024text

3-Minute Stand-Up Comedy Routine

(Walks on stage, looks around, shakes head.)
You ever wake up in the morning, stretch, take a deep breath... and immediately regret all your life choices?

I woke up today, my body made a noise I’ve never heard before. It wasn’t a crack, it wasn’t a pop… it was more like my bones whispered, “You did this.”

Aging is wild. When you’re a kid, you fall off a bike, scrape your knee, and just run it off. As an adult, I sleep slightly wrong, and now my neck is on strike for a week. Like, it doesn’t even negotiate. Just full-on protest mode.

And it’s not just the body. My patience has disappeared. I was in line at the grocery store, and the guy in front of me had, I kid you not, 19 coupons. That’s not a couponer; that’s a mathematician. He was doing long division at the register, carrying the one, solving for X… Sir, I am here for bread. I did not sign up for an SAT exam.

Speaking of the grocery store… why is it that no matter what I buy, the cashier always asks, "Do you need a bag?" Like, yes. I’m buying 17 things. You think I’m gonna carry them out like some kind of overachieving circus act? Balancing a watermelon on my shoulder, eggs under my chin?

And self-checkout? That’s just unpaid labor. I scanned three things, and the machine had the nerve to say, “Unexpected item in the bagging area.” First of all, you put the bag there. Second, don’t make me feel like I’m stealing when I clearly don’t have the coordination for crime.

Look, I know my limits. I’m not built for a life of crime. I can’t even jaywalk without looking both ways five times. Like, I’ll see an empty road and still be like, “Mmm… let me wait.” Meanwhile, some 80-year-old woman is just strolling past me like she owns the city. I saw a guy jaywalk in New York without even looking up from his phone. That’s next-level confidence. That’s a man who has made peace with whatever happens.

I respect it. I really do.

Anyway, thanks for listening to me complain. I hope all your bones stay silent tonight.

(Walks off stage.)

Try this prompt

Vote

9 / 48

09

Realistic AI Interviewconversation

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

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025text

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

10 / 48

10

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025text

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

11 / 48

11

Character Voice Testconversation

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

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025text

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

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

12 / 48

12

Minimalist Landing Pageweb design

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

Z.AI: GLM 4.6

Z.AI: GLM 4.6

Zhipu · Sep 2025website

Try this prompt

GPT-4o (Omni)

GPT-4o (Omni)

Openai · May 2024website

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Vote

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