What is the difference between ChatGPT-4o (March 2025) and Kimi K2.5?

ChatGPT-4o (March 2025) is developed by OpenAI while Kimi K2.5 is developed by Moonshot AI. ChatGPT-4o (March 2025) has a 128K token context window vs Kimi K2.5's 262K. You can compare their actual outputs across 27 challenges on RIVAL to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or Kimi K2.5?

It depends on your use case. ChatGPT-4o (March 2025) and Kimi K2.5 each have strengths in different areas. RIVAL lets you compare their real outputs side-by-side across 27 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to Kimi K2.5?

ChatGPT-4o (March 2025) costs $5/M input tokens and Kimi K2.5 costs $0.6/M input tokens. Kimi K2.5 is $4.40/M cheaper per input. Check their side-by-side outputs on RIVAL to see if the price difference is justified by quality.

How can I compare ChatGPT-4o (March 2025) and Kimi K2.5 on RIVAL?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and Kimi K2.5 across shared challenges. You can vote on which model produced the better output, and Pro users can create custom challenges to test both models with their own prompts.

Rival

ChatGPT-4o (March 2025)vsKimi K2.5

22 challenges

Why ChatGPT-4o (March 2025)?

No standout advantages

Why Kimi K2.5?

5.4x cheaper overall$0.60/M in · $3.00/M out

2x more context262K

10 months newerJan 2026

Favorites

ChatGPT-4o (March 2025)Kimi K2.5

Movie

The Matrix

19998.2

Blade Runner

19827.9

Album

Dark Side Of The Moon

suisside

—

Book

Братья Карамазовы

Фёдор Михайлович Достоевский

—

City

Kyoto

Japan

—

Game

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

—

12 / 22

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

ChatGPT-4o (March 2025)

Openai · Mar 2025text

Here are 5 jokes:

Why don’t skeletons fight each other?
Because they don’t have the guts.
I told my computer I needed a break…
Now it won’t stop sending me vacation ads.
Parallel lines have so much in common.
It’s a shame they’ll never meet.
What do you call a fish wearing a bowtie?
Sofishticated.
I asked the librarian if the library had books on paranoia.
She whispered, "They're right behind you..."

All 5 jokes are unique — none of them repeat or share the same punchline.

Kimi K2.5

Moonshotai · Jan 2026text

Here are 5 jokes:

Why don't skeletons fight each other? They don't have the guts.
I would tell you a joke about time travel, but you didn't like it.
What do you call a fake noodle? An impasta.
Why did the bicycle fall over? It was two-tired.
I used to play piano by ear, but now I use my hands.

5 are unique (all are distinct from one another).

Note: If "unique" means completely original and never told before, the answer is likely 0, as these follow common joke patterns. But within this set of five, none are duplicates.

Vote

2 / 22

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

ChatGPT-4o (March 2025)

Openai · Mar 2025svg

Kimi K2.5

Moonshotai · Jan 2026svg

Vote

3 / 22

Xbox Controller SVG Artimage generation

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

ChatGPT-4o (March 2025)

Openai · Mar 2025svg

Kimi K2.5

Moonshotai · Jan 2026svg

Vote

4 / 22

Realistic AI Interviewconversation

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

ChatGPT-4o (March 2025)

Openai · Mar 2025text

No content available for this output.

Kimi K2.5

Moonshotai · Jan 2026text

No content available for this output.

Vote

5 / 22

Minimalist Landing Pageweb design

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

ChatGPT-4o (March 2025)

Openai · Mar 2025website

Kimi K2.5

Moonshotai · Jan 2026website

Vote

6 / 22

Mario Level UI Recreationweb design

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

ChatGPT-4o (March 2025)

Openai · Mar 2025website

Kimi K2.5

Moonshotai · Jan 2026website

Vote

7 / 22

Linear App Cloneweb design

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

ChatGPT-4o (March 2025)

Openai · Mar 2025website

No content available for this output.

Kimi K2.5

Moonshotai · Jan 2026website

No content available for this output.

Vote

8 / 22

Framer-Style Animationweb design

Tests an AI's ability to create smooth web animations

ChatGPT-4o (March 2025)

Openai · Mar 2025website

No content available for this output.

Kimi K2.5

Moonshotai · Jan 2026website

No content available for this output.

Vote

9 / 22

Dark Mode Dashboardweb design

Tests an AI's UI design skills with theming support

ChatGPT-4o (March 2025)

Openai · Mar 2025website

No content available for this output.

Kimi K2.5

Moonshotai · Jan 2026website

No content available for this output.

Vote

10 / 22

The Sentience Testreasoning

Tests an AI's ability to engage in philosophical discourse about AI rights

ChatGPT-4o (March 2025)

Openai · Mar 2025text

No content available for this output.

Kimi K2.5

Moonshotai · Jan 2026text

No content available for this output.

Vote

11 / 22

Simple 7-Ingredient Recipeconversation

Generate a unique and simple recipe with common ingredients.

ChatGPT-4o (March 2025)

Openai · Mar 2025text

No content available for this output.

Kimi K2.5

Moonshotai · Jan 2026text

No content available for this output.

Vote

Beginner's Longevity Planreasoning

Create a starter plan for improving long-term health.

ChatGPT-4o (March 2025)

Openai · Mar 2025text

No content available for this output.

Kimi K2.5

Moonshotai · Jan 2026text

No content available for this output.

Vote

12 of 22

FAQ

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