Updated Sep 23, 2025

Our Verdict

GPT-5 Codex

Z.AI: GLM 4.5Runner-up

No community votes yet. On paper, GPT-5 Codex has the edge — bigger model tier, newer.

Too close to call

Writing DNA

Style Comparison

Similarity

95%

Z.AI: GLM 4.5 uses 3.7x more transitions

Z.AI: GLM 4.5

GPT-5 Codex

52%Vocabulary64%

14wSentence Length17w

0.49Hedging0.38

5.5Bold2.3

4.9Lists3.5

0.13Emoji0.15

0.68Headings0.49

0.20Transitions0.05

Based on 21 + 13 text responses

vs

Ask them anything yourself

Z.AI: GLM 4.5

GPT-5 Codex

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

Keep going

Z.AI: GLM 4.5 vs MiniMax M2.5New provider

Z.AI: GLM 4.5 vs Aurora AlphaNew provider

Z.AI: GLM 4.5 vs Grok 3New provider

Z.AI: GLM 4.5vsGPT-5 Codex

43 fights queued

Why Z.AI: GLM 4.5?

Dead even. This one's a coin flip.

Why GPT-5 Codex?

Leads 1 of 1 benchmarks

Stronger on SWE-bench Verified74.5% vs 64.2%

2 months newerSep 2025

Z.AI: GLM 4.5GPT-5 Codex

Input price

$0.60/M

—

Output price

$2.20/M

—

Context

128K

—

Released

Jul 2025

Sep 2025

Benchmarks1 common

SWE-bench Verified

64.2%

74.5%+13.8%

Favorites

Z.AI: GLM 4.5GPT-5 Codex

Movie

Inception

Inception

Blade Runner

Blade Runner

Album

—

Kind of Blue

City

—

Tokyo

Game

—

Minecraft

Minecraft

Action, Arcade4.4

12 / 43

01

Estimate Complexityreasoning

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

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025text

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025text

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

Try this prompt

Vote

2 / 43

02

AI Board Game Logicreasoning

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

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025svg

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025svg

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

Try this prompt

Vote

3 / 43

03

Logic Puzzlereasoning

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

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025text

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025text

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

Try this prompt

Vote

4 / 43

04

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025text

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025text

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

Try this prompt

Vote

5 / 43

05

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025text

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025text

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

Try this prompt

Vote

6 / 43

06

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025svg

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025svg

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

Try this prompt

Vote

Sponsored

7 / 43

07

Xbox Controller SVG Artimage generation

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

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025svg

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025svg

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

Try this prompt

Vote

8 / 43

08

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025text

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025text

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

Try this prompt

Vote

9 / 43

09

Realistic AI Interviewconversation

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

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025text

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025text

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

Try this prompt

Vote

10 / 43

10

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025text

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025text

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

Try this prompt

Vote

11 / 43

11

Character Voice Testconversation

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

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025text

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

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025text

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

Try this prompt

Vote

12 / 43

12

Minimalist Landing Pageweb design

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

Z.AI: GLM 4.5

Z.AI: GLM 4.5

Zhipu · Jul 2025website

Try this prompt

GPT-5 Codex

GPT-5 Codex

Openai · Sep 2025website

Try this prompt

Vote

This matchup has more rounds

31+ more head-to-head results. Free. Not a trick.

Free account. No card required. By continuing, you agree to Rival's Terms and Privacy Policy