What is the difference between GPT-4.1 and Kimi K2 Thinking?

GPT-4.1 is developed by OpenAI while Kimi K2 Thinking is developed by Moonshot AI. GPT-4.1 has a 1.0M token context window vs Kimi K2 Thinking's 262K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.1 or Kimi K2 Thinking?

It depends on your use case. GPT-4.1 and Kimi K2 Thinking 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 GPT-4.1 cost compared to Kimi K2 Thinking?

GPT-4.1 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 GPT-4.1 and Kimi K2 Thinking on Rival?

This page shows a side-by-side comparison of GPT-4.1 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 GPT-4.1 and Kimi K2 Thinking?

GPT-4.1 is developed by OpenAI while Kimi K2 Thinking is developed by Moonshot AI. GPT-4.1 has a 1.0M token context window vs Kimi K2 Thinking's 262K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.1 or Kimi K2 Thinking?

It depends on your use case. GPT-4.1 and Kimi K2 Thinking 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 GPT-4.1 cost compared to Kimi K2 Thinking?

GPT-4.1 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 GPT-4.1 and Kimi K2 Thinking on Rival?

This page shows a side-by-side comparison of GPT-4.1 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.

GPT-4.1 vs Kimi K2 Thinking: Which Is Better?

Updated Nov 2025

Our Verdict

GPT-4.1

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.

Kimi K2 Thinking is 3.2x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.1

Input

$2.00

Output

$8.00

Kimi K2 Thinking

Input

$0.60

3.3× cheaper

Output

$2.50

3.2× cheaper

Kimi K2 Thinking is cheaper on both — 3.3× input, 3.2× output

Writing DNA

Style Comparison

Similarity

52%

GPT-4.1 uses 23.7x more emoji

GPT-4.1

Kimi K2 Thinking

58%Vocabulary57%

19wSentence Length26w

0.38Hedging0.36

9.0Bold5.8

6.1Lists6.0

0.24Emoji0.00

1.01Headings0.56

0.07Transitions0.06

Based on 25 + 14 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-4.1 vs MiniMax M3New provider

GPT-4.1 vs Grok 3New provider

GPT-4.1 vs Llama 4 MaverickNew provider

Updated Nov 2025

Our Verdict

GPT-4.1

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.

Kimi K2 Thinking is 3.2x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.1

Input

$2.00

Output

$8.00

Kimi K2 Thinking

Input

$0.60

3.3× cheaper

Output

$2.50

3.2× cheaper

Kimi K2 Thinking is cheaper on both — 3.3× input, 3.2× output

Writing DNA

Style Comparison

Similarity

52%

GPT-4.1 uses 23.7x more emoji

GPT-4.1

Kimi K2 Thinking

58%Vocabulary57%

19wSentence Length26w

0.38Hedging0.36

9.0Bold5.8

6.1Lists6.0

0.24Emoji0.00

1.01Headings0.56

0.07Transitions0.06

Based on 25 + 14 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-4.1 vs MiniMax M3New provider

GPT-4.1 vs Grok 3New provider

GPT-4.1 vs Llama 4 MaverickNew provider