What is the difference between GPT-4.5 and MoonshotAI: Kimi K3?

GPT-4.5 is developed by OpenAI while MoonshotAI: Kimi K3 is developed by Moonshot AI. GPT-4.5 has a 128K token context window vs MoonshotAI: Kimi K3's 1.0M. You can compare their actual outputs across 24 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or MoonshotAI: Kimi K3?

It depends on your use case. GPT-4.5 and MoonshotAI: Kimi K3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 24 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to MoonshotAI: Kimi K3?

GPT-4.5 costs $75/M input tokens and MoonshotAI: Kimi K3 costs $3/M input tokens. MoonshotAI: Kimi K3 is $72.00/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 GPT-4.5 and MoonshotAI: Kimi K3 on Rival?

This page shows a side-by-side comparison of GPT-4.5 and MoonshotAI: Kimi K3 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 GPT-4.5 and MoonshotAI: Kimi K3?

GPT-4.5 is developed by OpenAI while MoonshotAI: Kimi K3 is developed by Moonshot AI. GPT-4.5 has a 128K token context window vs MoonshotAI: Kimi K3's 1.0M. You can compare their actual outputs across 24 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or MoonshotAI: Kimi K3?

It depends on your use case. GPT-4.5 and MoonshotAI: Kimi K3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 24 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to MoonshotAI: Kimi K3?

GPT-4.5 costs $75/M input tokens and MoonshotAI: Kimi K3 costs $3/M input tokens. MoonshotAI: Kimi K3 is $72.00/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 GPT-4.5 and MoonshotAI: Kimi K3 on Rival?

This page shows a side-by-side comparison of GPT-4.5 and MoonshotAI: Kimi K3 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.

GPT-4.5 vs MoonshotAI: Kimi K3: Which Is Better?

Updated Jul 2026

Our Verdict

GPT-4.5

MoonshotAI: Kimi K3

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

MoonshotAI: Kimi K3 is 10x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.5

Input

$75.00

Output

$150.00

MoonshotAI: Kimi K3

Input

$3.00

25× cheaper

Output

$15.00

10× cheaper

MoonshotAI: Kimi K3 is cheaper on both — 25× input, 10× output

Writing DNA

Style Comparison

Similarity

39%

MoonshotAI: Kimi K3 uses 77.9x more emoji

GPT-4.5

MoonshotAI: Kimi K3

63%Vocabulary58%

16wSentence Length21w

0.57Hedging0.46

4.7Bold3.6

6.4Lists3.4

0.00Emoji0.78

1.30Headings0.89

0.54Transitions0.17

Based on 11 + 27 text responses

Research

What we learned reading every model

GPT-4.5 and MoonshotAI: Kimi K3 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

GPT-4.5 vs MiniMax M3New provider

MoonshotAI: Kimi K3 vs GPT-5Cross-provider

GPT-4.5 vs Llama 4 MaverickNew provider

Updated Jul 2026

Our Verdict

GPT-4.5

MoonshotAI: Kimi K3

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

MoonshotAI: Kimi K3 is 10x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.5

Input

$75.00

Output

$150.00

MoonshotAI: Kimi K3

Input

$3.00

25× cheaper

Output

$15.00

10× cheaper

MoonshotAI: Kimi K3 is cheaper on both — 25× input, 10× output

Writing DNA

Style Comparison

Similarity

39%

MoonshotAI: Kimi K3 uses 77.9x more emoji

GPT-4.5

MoonshotAI: Kimi K3

63%Vocabulary58%

16wSentence Length21w

0.57Hedging0.46

4.7Bold3.6

6.4Lists3.4

0.00Emoji0.78

1.30Headings0.89

0.54Transitions0.17

Based on 11 + 27 text responses

Research

What we learned reading every model

GPT-4.5 and MoonshotAI: Kimi K3 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

GPT-4.5 vs MiniMax M3New provider

MoonshotAI: Kimi K3 vs GPT-5Cross-provider

GPT-4.5 vs Llama 4 MaverickNew provider