Updated Apr 7, 2026

Our Verdict

Gemini 2.5 Pro Experimental

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Gemini 2.5 Pro Experimental has the edge — bigger model tier, bigger context window, major provider backing.

Too close to call

Writing DNA

Style Comparison

Similarity

95%

Gemini 2.5 Pro Experimental uses 1.6x more transitions

Gemini 2.5 Pro Experimental

Z.ai: GLM 5.1

54%Vocabulary54%

15wSentence Length18w

0.35Hedging0.31

5.6Bold3.6

3.9Lists2.6

0.00Emoji0.00

0.39Headings0.43

0.17Transitions0.11

Based on 18 + 27 text responses

vs

Ask them anything yourself

Gemini 2.5 Pro Experimental

Z.ai: GLM 5.1

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

Keep going

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

Z.ai: GLM 5.1 vs Llama 4 MaverickNew provider

Gemini 2.5 Pro Experimental vs MiniMax M2.5New provider

Gemini 2.5 Pro ExperimentalvsZ.ai: GLM 5.1

36 fights queued

Why Gemini 2.5 Pro Experimental?

2x cheaper overall$1.00/M in · $2.00/M out

4.9x more context1.0M

Why Z.ai: GLM 5.1?

13 months newerApr 2026

Gemini 2.5 Pro ExperimentalZ.ai: GLM 5.1

Input price

$1.00/M

$1.40/M

Output price

$2.00/M

$4.40/M

Context

1.0M

203K

Released

Mar 2025

Apr 2026

Favorites

Gemini 2.5 Pro ExperimentalZ.ai: GLM 5.1

Movie

Khiam 2000-2007

Khiam 2000-2007

The Matrix

The Matrix

Album

The Dark Side of the Moon

The Dark Side of the Moon

OK Computer

Book

The Hitchh

Don Quijote de la Mancha

Don Quijote de la Mancha

Miguel de Cervantes Saavedra

City

Kyoto

Tokyo

Game

Portal 2

Portal 2

Shooter, Puzzle4.6

Portal

Portal

Action, Puzzle4.5

12 / 36

01

AI Board Game Logicreasoning

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

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025svg

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

Try this prompt

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

Vote

2 / 36

02

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025text

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

Try this prompt

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

Vote

3 / 36

03

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025svg

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

Try this prompt

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

Vote

4 / 36

04

Xbox Controller SVG Artimage generation

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

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025svg

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

Try this prompt

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

Vote

5 / 36

05

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025text

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

Try this prompt

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

Vote

6 / 36

06

Realistic AI Interviewconversation

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

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025text

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

Try this prompt

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

Vote

Sponsored

7 / 36

07

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025text

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

Try this prompt

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

Vote

8 / 36

08

Minimalist Landing Pageweb design

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

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025website

Try this prompt

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026website

Try this prompt

Vote

9 / 36

09

Pokémon Battle UI Recreationweb design

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

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025website

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

Try this prompt

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026website

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

Try this prompt

Vote

10 / 36

10

Mario Level UI Recreationweb design

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

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025website

Try this prompt

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026website

Try this prompt

Vote

11 / 36

11

Linear App Cloneweb design

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

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025website

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

Try this prompt

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026website

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

Try this prompt

Vote

12 / 36

12

Framer-Style Animationweb design

Tests an AI's ability to create smooth web animations

Gemini 2.5 Pro Experimental

Gemini 2.5 Pro Experimental

Google · Mar 2025website

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

Try this prompt

Z.ai: GLM 5.1

Z.ai: GLM 5.1

Z-ai · Apr 2026website

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

Try this prompt

Vote

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