What is the difference between Kimi K2 Thinking and OpenAI o4-mini?

Kimi K2 Thinking is developed by Moonshot AI while OpenAI o4-mini is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Kimi K2 Thinking or OpenAI o4-mini?

It depends on your use case. Kimi K2 Thinking and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Kimi K2 Thinking cost compared to OpenAI o4-mini?

Kimi K2 Thinking costs $0.6/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. Kimi K2 Thinking is $0.50/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 Kimi K2 Thinking and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of Kimi K2 Thinking and OpenAI o4-mini across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

What is the difference between Kimi K2 Thinking and OpenAI o4-mini?

Kimi K2 Thinking is developed by Moonshot AI while OpenAI o4-mini is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Kimi K2 Thinking or OpenAI o4-mini?

It depends on your use case. Kimi K2 Thinking and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Kimi K2 Thinking cost compared to OpenAI o4-mini?

Kimi K2 Thinking costs $0.6/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. Kimi K2 Thinking is $0.50/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 Kimi K2 Thinking and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of Kimi K2 Thinking and OpenAI o4-mini across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Kimi K2 Thinking vs OpenAI o4-mini: Which Is Better?

Updated Nov 2025

Our Verdict

Kimi K2 Thinking

OpenAI o4-miniRunner-up

No community votes yet. On paper, Kimi K2 Thinking has the edge — bigger model tier, newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Kimi K2 Thinking

Input

$0.60

1.8× cheaper

Output

$2.50

1.8× cheaper

OpenAI o4-mini

Input

$1.10

Output

$4.40

Kimi K2 Thinking is cheaper on both — 1.8× input, 1.8× output

Writing DNA

Style Comparison

Similarity

39%

Kimi K2 Thinking uses 582.4x more bold

Kimi K2 Thinking

OpenAI o4-mini

57%Vocabulary73%

26wSentence Length15w

0.36Hedging0.18

5.8Bold0.0

6.0Lists2.1

0.00Emoji0.00

0.56Headings0.00

0.06Transitions0.02

Based on 14 + 10 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

OpenAI o4-mini vs MiniMax M3New provider

Kimi K2 Thinking vs Grok 3New provider

Kimi K2 Thinking vs Llama 4 MaverickNew provider

Updated Nov 2025

Our Verdict

Kimi K2 Thinking

OpenAI o4-miniRunner-up

No community votes yet. On paper, Kimi K2 Thinking has the edge — bigger model tier, newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Kimi K2 Thinking

Input

$0.60

1.8× cheaper

Output

$2.50

1.8× cheaper

OpenAI o4-mini

Input

$1.10

Output

$4.40

Kimi K2 Thinking is cheaper on both — 1.8× input, 1.8× output

Writing DNA

Style Comparison

Similarity

39%

Kimi K2 Thinking uses 582.4x more bold

Kimi K2 Thinking

OpenAI o4-mini

57%Vocabulary73%

26wSentence Length15w

0.36Hedging0.18

5.8Bold0.0

6.0Lists2.1

0.00Emoji0.00

0.56Headings0.00

0.06Transitions0.02

Based on 14 + 10 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

OpenAI o4-mini vs MiniMax M3New provider

Kimi K2 Thinking vs Grok 3New provider

Kimi K2 Thinking vs Llama 4 MaverickNew provider