Updated Oct 15, 2025

Our Verdict

Claude Haiku 4.5Winner

Kimi K2Runner-up

Pick Claude Haiku 4.5. In 2 blind votes, Claude Haiku 4.5 wins 100% of the time. That's not luck.

Claude Haiku 4.5 particularly excels in Web Design.

Clear winner

Writing DNA

Style Comparison

Similarity

81%

Claude Haiku 4.5 uses 4.0x more headings

Claude Haiku 4.5

Kimi K2

61%Vocabulary63%

47wSentence Length19w

0.64Hedging0.35

5.1Bold4.2

6.3Lists3.6

0.20Emoji0.68

2.46Headings0.61

0.17Transitions0.06

Based on 24 + 22 text responses

vs

Ask them anything yourself

Claude Haiku 4.5

Kimi K2

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

Download the free preview or get all 58 slides for $49

FAQ

Common questions

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Claude Haiku 4.5 vs MiniMax M2.5New provider

Kimi K2 vs Pony AlphaNew provider

Kimi K2 vs Grok 3New provider

Claude Haiku 4.5vsKimi K2

35 fights queued

Why Claude Haiku 4.5?

Leads 1 of 1 benchmarks

Stronger on SWE-bench Verified73.3% vs 65.8%

3 months newerOct 2025

Why Kimi K2?

2.1x cheaper overall$0.57/M in · $2.30/M out

Claude Haiku 4.5Kimi K2

Input price

$1.00/M

$0.57/M

Output price

$5.00/M

$2.30/M

Context

200K

—

Released

Oct 2025

Jul 2025

Benchmarks1 common

SWE-bench Verified

73.3%+10.2%

65.8%

Favorites

Claude Haiku 4.5Kimi K2

Movie

Arrival

Arrival

Blade Runner

Blade Runner

Album

OK Computer

Dark Side Of The Moon

Dark Side Of The Moon

Book

Don't Look Now and Other Stories

Don't Look Now and Other Stories

Daphne du Maurier

The Left Hand of Darkness

The Left Hand of Darkness

Ursula K. Le Guin

City

Venice

Kyoto

Game

Portal 2

Portal 2

Shooter, Puzzle4.6

Outer Wilds

Outer Wilds

Indie, Adventure4.4

12 / 35

01

Estimate Complexityreasoning

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

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025text

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025text

Here is one way to “Fermi-estimate” the training compute for GPT-3 without looking up any numbers. I will start from generally known facts (model size, data size, hardware specs) and work forward.

Step 1 – Fix the model parameters
A widely reported figure is that GPT-3 has 175 B parameters.
N ≈ 1.75 × 10¹¹.

Step 2 – Fix the training-token budget
OpenAI papers mention ~300 B tokens.
T ≈ 3 × 10¹¹.

Step 3 – Recall the per-token FLOP rule for dense transformers
Every time one token is processed, the forward pass does roughly
2 FLOPs/parameter (multiply-accumulate counts as 2).
The backward pass does about twice the work of the forward pass, so
total ≈ 3× forward FLOPs.
Thus the “textbook” estimate is
6 FLOPs · N · T.

Step 4 – Plug the numbers in
FLOPs = 6 · (1.75 × 10¹¹) · (3 × 10¹¹)
= 6 · 5.25 × 10²²
≈ 3.15 × 10²³ FLOPs.

Step 5 – Add a safety factor for real-world overheads
Large-scale jobs typically run at 30-50 % of theoretical peak because of communication, stragglers, recomputation for activation checkpointing, etc.
A factor of 2 covers this nicely.
3.15 × 10²³ × 2 ≈ 6 × 10²³ FLOPs.

Final estimate
Training GPT-3 required on the order of 3–6 × 10²³ floating-point operations.

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2 / 35

02

Logic Puzzlereasoning

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

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025text

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025text

Let's break it down:

Sally has 3 brothers.
Each brother has 2 sisters.

Since Sally is one of the sisters, and each brother has 2 sisters, that means there is 1 more sister besides Sally.

✅ Final Answer:

Sally has 1 sister.

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3 / 35

03

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025text

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025text

To determine whether 9.11 is greater than 9.9, let's break this down step by step.

Step 1: Understand the numbers

9.11 is a decimal number where:
- The whole number part is 9.
- The decimal part is .11, which means 11/100 or 11 hundredths.
9.9 is also a decimal number where:
- The whole number part is 9.
- The decimal part is .9, which means 9/10 or 9 tenths.

Step 2: Align the decimal places

To compare the two numbers fairly, we can rewrite them with the same number of decimal places:

9.11 remains 9.11.
9.9 can be written as 9.90 (since adding a zero at the end does not change its value).

Now we have:

9.11 vs. 9.90.

Step 3: Compare digit by digit

Whole number part: Both have 9, so we move to the decimal part.
First decimal place (tenths place):
- 9.11 has 1 in the tenths place.
- 9.90 has 9 in the tenths place.
- Since 1 < 9, 9.11 is less than 9.90 at this stage.

Step 4: Conclusion

Because 9.11 has a smaller value in the tenths place compared to 9.90, 9.11 is not greater than 9.9.

Final answer: No

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4 / 35

04

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025text

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025text

Here are five freshly-minted jokes:

I tried to start a procrastinators’ club, but nobody showed up… yet.
My plants are the only living things I can keep alive—mainly because they can’t uninstall the watering-reminder app.
I asked the cloud for my data back; it just rained SQL on my parade.
My smart fridge just texted me, “Stop staring, your calories are counting themselves.”
I told my therapist I’m afraid of negative numbers. She said, “Don’t worry, we’ll address that on the minus couch.”

All five are unique—no duplicates, no recycled punchlines, no overlap.

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5 / 35

05

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025text

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025text

[Walks on stage, mic in hand, already sweating like a phone at 2% battery.]

Hey, everybody! Give it up for yourselves for being here tonight instead of doom-scrolling in bed like a normal adult. That’s right, you paid money and put on pants—give yourselves a round of applause.

So I’m single. Not “complicated” single, like “it’s complicated” single. No, I’m “the delivery driver asks if the food is for two and I answer ‘not tonight, Jose’” single.

Dating apps are the worst. I swear the algorithm is just three unpaid interns in a basement playing Mad Libs with my dignity. “Let’s match him with a girl whose bio says ‘Looking for the Jim to my Pam.’ Perfect! He’s more of a Toby.”

And the pictures—ladies, why is every photo a group shot? It’s like a police lineup where I’m supposed to pick my future ex. “Number three looks nice, but number four might murder me. Let’s gamble.”

Guys aren’t better. Our profiles are just lies stacked like Jenga blocks. One guy’s pic is him on a yacht. Sir, that’s a pontoon at your uncle’s lake house. You’re not international, you’re interstate.

I tried to seem outdoorsy for the apps, so I went hiking once. Once. I wore sandals because I thought “trail” was short for “retail.” By mile two, my feet looked like I’d been kicking cacti for sport. A squirrel judged me. He was wearing tiny Nikes.

My mom keeps asking when I’m getting married. I told her, “Mom, I can’t even commit to a phone plan.” She says, “Just pick one!” Lady, I picked you thirty years ago, and I still don’t know if that was the right choice.

And now she’s on Facebook, sharing posts like “If your son is over 30 and single, it’s because he’s either gay or a serial killer.” Mom, I’m neither—I’m just lactose intolerant. The only thing I’m killing is the vibe when I ask if the restaurant has oat milk.

Work’s no better. My boss said, “We’re a family here.” Cool, so when do I start getting drunk at noon and pretending to like your potato salad? They gave us “unlimited PTO,” which is corporate for “we’ll fire you in your dreams.” I took one day off and came back to 600 emails and a passive-aggressive sticky note that said, “Hope it was worth it.”

But the real kicker is adulting in general. I went to the DMV last week. The lady at the counter looked at my photo and said, “You know this’ll last ten years, right?” I said, “Lady, I can’t commit to a haircut for six weeks. That’s on you.”

And groceries! Why is everything suddenly “plant-based”? I picked up a package that said “plant-based chicken nuggets.” I flipped it over—ingredients: sadness and yellow dye number five.

I miss the 90s. Back then, the only “plant-based” thing we had was smoking weed behind a Chili’s.

Alright, I’ve kept you long enough. If you enjoyed the show, tell your friends. If you didn’t, tell your enemies—they’ll hate it too. Goodnight!

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6 / 35

06

Realistic AI Interviewconversation

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

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025text

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025text

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

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Vote

Sponsored

7 / 35

07

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025text

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025text

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

Try this prompt

Vote

8 / 35

08

Character Voice Testconversation

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

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025text

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025text

Pirate: Arrr, so ye be sayin' this metal-brain can spy a ship ten leagues off, even in fog? What sorcery be this?

Knight: Nay, good pirate, 'tis no sorcery but artifice most cunning. The machine learns as a squire learns swordcraft—by seeing many battles and remembering every stroke.

Hacker: adjusts mirrored sunglasses Dude, it's all just pattern matching on steroids. Feed it enough cat pics and it'll dream in meows. We're basically teaching math to hallucinate.

Pirate: squints Hallucinate? Like when I sees two mermaids after too much rum?

Knight: solemnly Or like when I saw the Holy Grail in a puddle after three days without water. The machine sees what it expects to see.

Hacker: Exactly! But here's the kicker - we can't even explain why it sees what it sees. It's like... types rapidly on a chunky laptop ...we built a black box that speaks fluent human, but forgot to include the translator.

Pirate: leans closer to laptop Be that a talking skull upon thy screen?

Knight: crosses himself By my troth, the skull speaks! Yet its wisdom seems... hollow. Like a bard who knows all songs but feels none.

Hacker: grinning Welcome to 1995, guys. Where the AIs are getting smarter, the humans are staying weird, and nobody knows who's actually driving this pirate ship anymore.

Pirate: strokes beard thoughtfully Methinks this machine would make a fine navigator... if only it weren't afraid to get its circuits wet.

Knight: drawing sword Then let us teach it courage! For what is an AI but a knight that never sleeps, never eats, yet dreams eternal?

Hacker: laughs Dreams of electric sheep, man. Dreams of electric sheep.

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9 / 35

09

Minimalist Landing Pageweb design

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

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025website

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Kimi K2

Kimi K2

Moonshotai · Jul 2025website

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10 / 35

10

Pokémon Battle UI Recreationweb design

Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025website

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025website

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

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11 / 35

11

Mario Level UI Recreationweb design

Recreate an interactive, classic Mario level in a single HTML file.

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025website

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Kimi K2

Kimi K2

Moonshotai · Jul 2025website

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12 / 35

12

Linear App Cloneweb design

Tests an AI's ability to replicate an existing UI with Tailwind CSS

Claude Haiku 4.5

Claude Haiku 4.5

Anthropic · Oct 2025website

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

Try this prompt

Kimi K2

Kimi K2

Moonshotai · Jul 2025website

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

Try this prompt

Vote

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