What is the difference between Grok 4.5 and Kimi K2 Thinking?

Grok 4.5 is developed by xAI while Kimi K2 Thinking is developed by Moonshot AI. Grok 4.5 has a 500K token context window vs Kimi K2 Thinking's 262K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Grok 4.5 or Kimi K2 Thinking?

It depends on your use case. Grok 4.5 and Kimi K2 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Grok 4.5 cost compared to Kimi K2 Thinking?

Grok 4.5 costs $2/M input tokens and Kimi K2 Thinking costs $0.6/M input tokens. Kimi K2 Thinking is $1.40/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 Grok 4.5 and Kimi K2 Thinking on Rival?

This page shows a side-by-side comparison of Grok 4.5 and Kimi K2 Thinking 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 Grok 4.5 and Kimi K2 Thinking?

Grok 4.5 is developed by xAI while Kimi K2 Thinking is developed by Moonshot AI. Grok 4.5 has a 500K token context window vs Kimi K2 Thinking's 262K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Grok 4.5 or Kimi K2 Thinking?

It depends on your use case. Grok 4.5 and Kimi K2 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Grok 4.5 cost compared to Kimi K2 Thinking?

Grok 4.5 costs $2/M input tokens and Kimi K2 Thinking costs $0.6/M input tokens. Kimi K2 Thinking is $1.40/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 Grok 4.5 and Kimi K2 Thinking on Rival?

This page shows a side-by-side comparison of Grok 4.5 and Kimi K2 Thinking 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.

Grok 4.5 vs Kimi K2 Thinking: Which Is Better?

Updated Jul 2026

Our Verdict

Grok 4.5

Kimi K2 Thinking

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

Too close to call

What do Grok 4.5 and Kimi K2 Thinking say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Grok 4.5

Input

$2.00

Output

$6.00

Kimi K2 Thinking

Input

$0.60

3.3× cheaper

Output

$2.50

2.4× cheaper

Kimi K2 Thinking is cheaper on both — 3.3× input, 2.4× output

Writing DNA

Style Comparison

Similarity

39%

Grok 4.5 uses 9.0x more emoji

Grok 4.5

Kimi K2 Thinking

61%Vocabulary57%

16wSentence Length26w

0.23Hedging0.36

2.5Bold5.8

2.4Lists6.0

0.09Emoji0.00

0.48Headings0.56

0.06Transitions0.06

Based on 27 + 14 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 4.5 vs MiniMax M3New provider

Grok 4.5 vs Ox AlphaNew provider

Grok 4.5 vs OpenAI o3New provider

Updated Jul 2026

Our Verdict

Grok 4.5

Kimi K2 Thinking

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

Too close to call

What do Grok 4.5 and Kimi K2 Thinking say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Grok 4.5

Input

$2.00

Output

$6.00

Kimi K2 Thinking

Input

$0.60

3.3× cheaper

Output

$2.50

2.4× cheaper

Kimi K2 Thinking is cheaper on both — 3.3× input, 2.4× output

Writing DNA

Style Comparison

Similarity

39%

Grok 4.5 uses 9.0x more emoji

Grok 4.5

Kimi K2 Thinking

61%Vocabulary57%

16wSentence Length26w

0.23Hedging0.36

2.5Bold5.8

2.4Lists6.0

0.09Emoji0.00

0.48Headings0.56

0.06Transitions0.06

Based on 27 + 14 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 4.5 vs MiniMax M3New provider

Grok 4.5 vs Ox AlphaNew provider

Grok 4.5 vs OpenAI o3New provider