What is the difference between GPT-5.1-Codex-Mini and Kimi K2 Thinking?

GPT-5.1-Codex-Mini is developed by OpenAI while Kimi K2 Thinking is developed by Moonshot AI. GPT-5.1-Codex-Mini has a 400K 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, GPT-5.1-Codex-Mini or Kimi K2 Thinking?

It depends on your use case. GPT-5.1-Codex-Mini 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 GPT-5.1-Codex-Mini cost compared to Kimi K2 Thinking?

GPT-5.1-Codex-Mini costs $1.5/M input tokens and Kimi K2 Thinking costs $0.6/M input tokens. Kimi K2 Thinking is $0.90/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 GPT-5.1-Codex-Mini and Kimi K2 Thinking on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex-Mini 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-5.1-Codex-Mini and Kimi K2 Thinking?

GPT-5.1-Codex-Mini is developed by OpenAI while Kimi K2 Thinking is developed by Moonshot AI. GPT-5.1-Codex-Mini has a 400K 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, GPT-5.1-Codex-Mini or Kimi K2 Thinking?

It depends on your use case. GPT-5.1-Codex-Mini 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 GPT-5.1-Codex-Mini cost compared to Kimi K2 Thinking?

GPT-5.1-Codex-Mini costs $1.5/M input tokens and Kimi K2 Thinking costs $0.6/M input tokens. Kimi K2 Thinking is $0.90/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 GPT-5.1-Codex-Mini and Kimi K2 Thinking on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex-Mini 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-5.1-Codex-Mini vs Kimi K2 Thinking: Which Is Better?

Updated Nov 2025

Our Verdict

GPT-5.1-Codex-Mini

Kimi K2 ThinkingRunner-up

No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — bigger context window, major provider backing.

Too close to call

What do GPT-5.1-Codex-Mini 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

GPT-5.1-Codex-Mini

Input

$1.50

Output

$6.00

Kimi K2 Thinking

Input

$0.60

2.5× cheaper

Output

$2.50

2.4× cheaper

Kimi K2 Thinking is cheaper on both — 2.5× input, 2.4× output

Writing DNA

Style Comparison

Similarity

45%

Kimi K2 Thinking uses 7.3x more headings

GPT-5.1-Codex-Mini

Kimi K2 Thinking

65%Vocabulary57%

20wSentence Length26w

0.56Hedging0.36

3.3Bold5.8

3.4Lists6.0

0.00Emoji0.00

0.08Headings0.56

0.05Transitions0.06

Based on 13 + 14 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-5.1-Codex-Mini vs MiniMax M3New provider

GPT-5.1-Codex-Mini vs Ox AlphaNew provider

GPT-5.1-Codex-Mini vs Grok 3New provider

Updated Nov 2025

Our Verdict

GPT-5.1-Codex-Mini

Kimi K2 ThinkingRunner-up

No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — bigger context window, major provider backing.

Too close to call

What do GPT-5.1-Codex-Mini 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

GPT-5.1-Codex-Mini

Input

$1.50

Output

$6.00

Kimi K2 Thinking

Input

$0.60

2.5× cheaper

Output

$2.50

2.4× cheaper

Kimi K2 Thinking is cheaper on both — 2.5× input, 2.4× output

Writing DNA

Style Comparison

Similarity

45%

Kimi K2 Thinking uses 7.3x more headings

GPT-5.1-Codex-Mini

Kimi K2 Thinking

65%Vocabulary57%

20wSentence Length26w

0.56Hedging0.36

3.3Bold5.8

3.4Lists6.0

0.00Emoji0.00

0.08Headings0.56

0.05Transitions0.06

Based on 13 + 14 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-5.1-Codex-Mini vs MiniMax M3New provider

GPT-5.1-Codex-Mini vs Ox AlphaNew provider

GPT-5.1-Codex-Mini vs Grok 3New provider