Updated Nov 21, 2025

Our Verdict

Grok 4.1 Fast

o1Runner-up

No community votes yet. On paper, Grok 4.1 Fast has the edge — bigger model tier, newer.

Too close to call

Writing DNA

Style Comparison

Similarity

98%

o1 uses 4.4x more hedging

Grok 4.1 Fast

o1

67%Vocabulary64%

15wSentence Length16w

0.17Hedging0.76

4.7Bold5.0

3.7Lists2.6

0.00Emoji0.00

0.99Headings0.44

0.14Transitions0.40

Based on 24 + 13 text responses

vs

Ask them anything yourself

Grok 4.1 Fast

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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o1 vs Llama 4 MaverickNew provider

o1 vs Gemini 2.5 Pro (I/O Edition)New provider

o1 vs Claude Opus 4New provider

Grok 4.1 Fastvso1

49 fights queued

Why Grok 4.1 Fast?

12 months newerNov 2025

Why o1?

Dead even. This one's a coin flip.

Grok 4.1 Fasto1

Input price

—

$15.00/M

Output price

—

$60.00/M

Context

—

128K

Released

Nov 2025

Dec 2024

Favorites

Grok 4.1 Fasto1

Movie

The Matrix

The Matrix

Inception

Inception

Album

OK Computer

—

Book

The Hitch Hiker's Guide to the Galaxy

The Hitch Hiker's Guide to the Galaxy

—

City

Tokyo

—

Game

The Hitchhiker's Guide to the Galaxy

The Hitchhiker's Guide to the Galaxy

—

12 / 49

01

Estimate Complexityreasoning

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

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025text

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

Try this prompt

o1

Openai · Dec 2024text

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

Try this prompt

Vote

2 / 49

02

AI Board Game Logicreasoning

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

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025svg

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

Try this prompt

o1

Openai · Dec 2024svg

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

Try this prompt

Vote

3 / 49

03

Logic Puzzlereasoning

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

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025text

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

Try this prompt

o1

Openai · Dec 2024text

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

Try this prompt

Vote

4 / 49

04

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025text

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

Try this prompt

o1

Openai · Dec 2024text

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

Try this prompt

Vote

5 / 49

05

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025text

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

Try this prompt

o1

Openai · Dec 2024text

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

Try this prompt

Vote

6 / 49

06

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025svg

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

Try this prompt

o1

Openai · Dec 2024svg

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

Try this prompt

Vote

Sponsored

7 / 49

07

Xbox Controller SVG Artimage generation

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

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025svg

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

Try this prompt

o1

Openai · Dec 2024svg

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

Try this prompt

Vote

8 / 49

08

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025text

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

Try this prompt

o1

Openai · Dec 2024text

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

Try this prompt

Vote

9 / 49

09

Realistic AI Interviewconversation

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

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025text

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

Try this prompt

o1

Openai · Dec 2024text

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

Try this prompt

Vote

10 / 49

10

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025text

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

Try this prompt

o1

Openai · Dec 2024text

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

Try this prompt

Vote

11 / 49

11

Character Voice Testconversation

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

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025text

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

Try this prompt

o1

Openai · Dec 2024text

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

Try this prompt

Vote

12 / 49

12

Minimalist Landing Pageweb design

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

Grok 4.1 Fast

Grok 4.1 Fast

Xai · Nov 2025website

Try this prompt

o1

Openai · Dec 2024website

Try this prompt

Vote

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