Updated Oct 6, 2025

Our Verdict

GPT-5 Pro

Grok 3Runner-up

No community votes yet. On paper, GPT-5 Pro has the edge — newer, bigger context window.

Too close to call

Writing DNA

Style Comparison

Similarity

97%

Grok 3 uses 246.4x more bold

GPT-5 Pro

Grok 3

65%Vocabulary49%

15wSentence Length18w

0.32Hedging0.94

0.0Bold2.5

2.9Lists3.0

0.00Emoji0.04

0.00Headings0.65

0.01Transitions0.08

Based on 11 + 17 text responses

vs

Ask them anything yourself

GPT-5 Pro

Grok 3

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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GPT-5 Pro vs Llama 4 MaverickNew provider

GPT-5 Pro vs Gemini 2.5 Pro (I/O Edition)New provider

GPT-5 Pro vs Claude Opus 4New provider

GPT-5 ProvsGrok 3

37 fights queued

Why GPT-5 Pro?

3.1x more context400K

Stronger on SWE-bench Verified74.9% vs 63.8%

8 months newerOct 2025

Why Grok 3?

Stronger on LiveCodeBench79.4% vs 54.3%

GPT-5 ProGrok 3

Input price

$15.00/M

—

Output price

$120.00/M

—

Context

400K

128K

Released

Oct 2025

Feb 2025

Benchmarks2 common

54.3%

79.4%+31.6%

SWE-bench Verified

74.9%+14.8%

63.8%

Favorites

GPT-5 ProGrok 3

Movie

—

The Matrix

The Matrix

Album

—

Dark Side Of The Moon

Dark Side Of The Moon

Book

—

Nineteen Eighty-Four

Nineteen Eighty-Four

City

—

Tokyo

Game

—

Portal

Portal

Action, Puzzle4.5

12 / 37

01

Estimate Complexityreasoning

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

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

2 / 37

02

AI Board Game Logicreasoning

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025svg

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.

Try this prompt

Vote

3 / 37

03

Logic Puzzlereasoning

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

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

4 / 37

04

Math Misconception Testreasoning

Tests an AI's understanding of number representation

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

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

5 / 37

05

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

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

6 / 37

06

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025svg

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025svg

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

Try this prompt

Vote

Sponsored

7 / 37

07

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

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

8 / 37

08

Realistic AI Interviewconversation

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

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 / 37

09

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

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 / 37

10

Character Voice Testconversation

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

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 / 37

11

Mario Level UI Recreationweb design

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025website

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

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025website

Try this prompt

Vote

12 / 37

12

Framer-Style Animationweb design

Tests an AI's ability to create smooth web animations

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025website

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

Try this prompt

Grok 3

Grok 3

Xai · Feb 2025website

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

Try this prompt

Vote

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