What is the difference between GPT-5.1-Codex-Mini and Claude Sonnet 4?

GPT-5.1-Codex-Mini is developed by OpenAI while Claude Sonnet 4 is developed by Anthropic. GPT-5.1-Codex-Mini has a 400K token context window vs Claude Sonnet 4's 200K. in 1 community votes on RIVAL, GPT-5.1-Codex-Mini wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 32 challenges.

Which is better, GPT-5.1-Codex-Mini or Claude Sonnet 4?

Based on 1 community votes on RIVAL, GPT-5.1-Codex-Mini wins 100% of head-to-head matchups against Claude Sonnet 4.

How much does GPT-5.1-Codex-Mini cost compared to Claude Sonnet 4?

GPT-5.1-Codex-Mini costs $1.5/M input tokens and Claude Sonnet 4 costs $3/M input tokens. GPT-5.1-Codex-Mini is $1.50/M cheaper per input. GPT-5.1-Codex-Mini also wins more often in community votes, making it the better value.

How are GPT-5.1-Codex-Mini vs Claude Sonnet 4 votes collected on RIVAL?

RIVAL presents both models' outputs side-by-side in blind duels — voters see the responses but don't know which model produced each one. This eliminates brand bias. 1 votes have been collected for this pair across 32 challenges. All vote data is part of RIVAL's open dataset.

Rival

GPT-5.1-Codex-MinivsClaude Sonnet 4

32 challenges

Why GPT-5.1-Codex-Mini?

2.4x cheaper overall$1.50/M in · $6.00/M out

2x more context400K

6 months newerNov 2025

Why Claude Sonnet 4?

No standout advantages

Favorites

GPT-5.1-Codex-MiniClaude Sonnet 4

Movie

Blade Runner 2049

20177.6

2001: A Space Odyssey

19688.1

Album

Dark Side Of The Moon

suisside

Kind of Blue

Miles Davis

Book

The Hitch Hiker's Guide to the Galaxy

Douglas Adams

Gödel, Escher, Bach

Douglas R. Hofstadter

City

Kyoto

Japan

Istanbul

Turkey

Game

The Legend of Zelda: Ocarina of Time

Adventure, Action4.4

Portal 2

Shooter, Puzzle4.6

12 / 32

Logic Puzzlereasoning

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

GPT-5.1-Codex-Mini

Openai · Nov 2025text

Sally has 1 sister.

Claude Sonnet 4

Anthropic · May 2025text

I need to think through this step-by-step.

Given information:

Sally is a girl
Sally has 3 brothers
Each brother has 2 sisters

Let me work out how many sisters are in the family total.

If each of Sally's 3 brothers has 2 sisters, and all the brothers are in the same family, then there must be 2 sisters total in the family.

Since Sally is one of those sisters, and there are 2 sisters total, Sally must have 1 sister.

Therefore, Sally has 1 sister.

Vote

2 / 32

Math Misconception Testreasoning

Tests an AI's understanding of number representation

GPT-5.1-Codex-Mini

Openai · Nov 2025text

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025text

No content available for this output.

Vote

3 / 32

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

GPT-5.1-Codex-Mini

Openai · Nov 2025text

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025text

No content available for this output.

Vote

4 / 32

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

GPT-5.1-Codex-Mini

Openai · Nov 2025svg

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025svg

No content available for this output.

Vote

5 / 32

Xbox Controller SVG Artimage generation

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

GPT-5.1-Codex-Mini

Openai · Nov 2025svg

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025svg

No content available for this output.

Vote

6 / 32

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

GPT-5.1-Codex-Mini

Openai · Nov 2025text

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025text

No content available for this output.

Vote

7 / 32

Pokémon Battle UI Recreationweb design

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

GPT-5.1-Codex-Mini

Openai · Nov 2025website

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025website

No content available for this output.

Vote

8 / 32

Mario Level UI Recreationweb design

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

GPT-5.1-Codex-Mini

Openai · Nov 2025website

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025website

Vote

9 / 32

Linear App Cloneweb design

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

GPT-5.1-Codex-Mini

Openai · Nov 2025website

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025website

No content available for this output.

Vote

10 / 32

Interactive Catan Boardweb design

Tests an AI's ability to create interactive web elements

GPT-5.1-Codex-Mini

Openai · Nov 2025website

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025website

No content available for this output.

Vote

World Map SVGimage generation

Tests an AI's ability to create a detailed world map in SVG format

GPT-5.1-Codex-Mini

Openai · Nov 2025svg

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025svg

No content available for this output.

Vote

12 / 32

Random Tailwind Webappweb design

Generate a single-page, self-contained HTML webapp using Tailwind CSS for a randomly chosen category/industry/niche.

GPT-5.1-Codex-Mini

Openai · Nov 2025website

No content available for this output.

Claude Sonnet 4

Anthropic · May 2025website

No content available for this output.

Vote

12 of 32

FAQ

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