What is the difference between Kimi K3 and o3 Mini?

Kimi K3 is developed by Moonshot AI while o3 Mini is developed by OpenAI. Kimi K3 has a 1.0M token context window vs o3 Mini's 64K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Kimi K3 or o3 Mini?

It depends on your use case. Kimi K3 and o3 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 K3 cost compared to o3 Mini?

Kimi K3 costs $3/M input tokens and o3 Mini costs $1.1/M input tokens. o3 Mini is $1.90/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 K3 and o3 Mini on Rival?

This page shows a side-by-side comparison of Kimi K3 and o3 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 K3 and o3 Mini?

Kimi K3 is developed by Moonshot AI while o3 Mini is developed by OpenAI. Kimi K3 has a 1.0M token context window vs o3 Mini's 64K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Kimi K3 or o3 Mini?

It depends on your use case. Kimi K3 and o3 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 K3 cost compared to o3 Mini?

Kimi K3 costs $3/M input tokens and o3 Mini costs $1.1/M input tokens. o3 Mini is $1.90/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 K3 and o3 Mini on Rival?

This page shows a side-by-side comparison of Kimi K3 and o3 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 K3 vs o3 Mini: Which Is Better?

Updated Jul 2026

Our Verdict

Kimi K3

o3 MiniRunner-up

No community votes yet. On paper, Kimi K3 has the edge — bigger model tier, newer, bigger context window.

o3 Mini is 3.4x cheaper per token — worth considering if cost matters.

Too close to call

What do Kimi K3 and o3 Mini say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Kimi K3

Input

$3.00

Output

$15.00

o3 Mini

Input

$1.10

2.7× cheaper

Output

$4.40

3.4× cheaper

o3 Mini is cheaper on both — 2.7× input, 3.4× output

Writing DNA

Style Comparison

Similarity

44%

Kimi K3 uses 77.9x more emoji

Kimi K3

o3 Mini

58%Vocabulary65%

21wSentence Length17w

0.46Hedging0.74

3.6Bold3.9

3.4Lists1.7

0.78Emoji0.00

0.89Headings0.47

0.17Transitions0.38

Based on 27 + 12 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

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o3 Mini vs MiniMax M3New provider

o3 Mini vs Llama 4 MaverickNew provider

Updated Jul 2026

Our Verdict

Kimi K3

o3 MiniRunner-up

No community votes yet. On paper, Kimi K3 has the edge — bigger model tier, newer, bigger context window.

o3 Mini is 3.4x cheaper per token — worth considering if cost matters.

Too close to call

What do Kimi K3 and o3 Mini say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Kimi K3

Input

$3.00

Output

$15.00

o3 Mini

Input

$1.10

2.7× cheaper

Output

$4.40

3.4× cheaper

o3 Mini is cheaper on both — 2.7× input, 3.4× output

Writing DNA

Style Comparison

Similarity

44%

Kimi K3 uses 77.9x more emoji

Kimi K3

o3 Mini

58%Vocabulary65%

21wSentence Length17w

0.46Hedging0.74

3.6Bold3.9

3.4Lists1.7

0.78Emoji0.00

0.89Headings0.47

0.17Transitions0.38

Based on 27 + 12 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

o3 Mini vs Ox AlphaNew provider

o3 Mini vs MiniMax M3New provider

o3 Mini vs Llama 4 MaverickNew provider