What is the difference between OpenAI Codex Mini and Kimi K2?

OpenAI Codex Mini is developed by OpenAI while Kimi K2 is developed by Moonshot AI. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, OpenAI Codex Mini or Kimi K2?

It depends on your use case. OpenAI Codex Mini and Kimi K2 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

How much does OpenAI Codex Mini cost compared to Kimi K2?

OpenAI Codex Mini costs $1.5/M input tokens and Kimi K2 costs $0.57/M input tokens. Kimi K2 is $0.93/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 OpenAI Codex Mini and Kimi K2 on Rival?

This page shows a side-by-side comparison of OpenAI Codex Mini and Kimi K2 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 OpenAI Codex Mini and Kimi K2?

OpenAI Codex Mini is developed by OpenAI while Kimi K2 is developed by Moonshot AI. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, OpenAI Codex Mini or Kimi K2?

It depends on your use case. OpenAI Codex Mini and Kimi K2 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

How much does OpenAI Codex Mini cost compared to Kimi K2?

OpenAI Codex Mini costs $1.5/M input tokens and Kimi K2 costs $0.57/M input tokens. Kimi K2 is $0.93/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 OpenAI Codex Mini and Kimi K2 on Rival?

This page shows a side-by-side comparison of OpenAI Codex Mini and Kimi K2 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.

Updated Jul 2025

OpenAI Codex MinivsKimi K2

Kimi K2 is cheaper than OpenAI Codex Mini at $0.57/M vs $1.5/M input tokens.

OpenAI Codex Mini and Kimi K2 compared across 10 shared prompts
Spec	OpenAI Codex Mini	Kimi K2
Input price	$1.5/M tokens	$0.57/M tokens
Output price	$6/M tokens	$2.3/M tokens
Context window	200K tokens	—
Released	May 2025	Jul 2025
SWE-bench Verified	71.3%	65.8%

Our Verdict

Kimi K2

OpenAI Codex MiniRunner-up

Not enough votes to call it. On the specs, Kimi K2 has the edge: bigger model tier, newer.

Too close to call

What do OpenAI Codex Mini and Kimi K2 say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

OpenAI Codex Mini

Input

$1.50

Output

$6.00

Kimi K2

Input

$0.57

2.6× cheaper

Output

$2.30

2.6× cheaper

Kimi K2 is cheaper on both — 2.6× input, 2.6× output

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

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Updated Jul 2025

OpenAI Codex MinivsKimi K2

Kimi K2 is cheaper than OpenAI Codex Mini at $0.57/M vs $1.5/M input tokens.

OpenAI Codex Mini and Kimi K2 compared across 10 shared prompts
Spec	OpenAI Codex Mini	Kimi K2
Input price	$1.5/M tokens	$0.57/M tokens
Output price	$6/M tokens	$2.3/M tokens
Context window	200K tokens	—
Released	May 2025	Jul 2025
SWE-bench Verified	71.3%	65.8%