What is the difference between Grok 4 and Kimi K2 0905?

Grok 4 is developed by xAI while Kimi K2 0905 is developed by Moonshot AI. Grok 4 has a 256K token context window vs Kimi K2 0905's 262K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Grok 4 or Kimi K2 0905?

It depends on your use case. Grok 4 and Kimi K2 0905 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 Grok 4 cost compared to Kimi K2 0905?

Grok 4 costs $3/M input tokens and Kimi K2 0905 costs $0.6/M input tokens. Kimi K2 0905 is $2.40/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 and Kimi K2 0905 on Rival?

This page shows a side-by-side comparison of Grok 4 and Kimi K2 0905 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 Sep 2025

Grok 4vsKimi K2 0905

Kimi K2 0905 is cheaper than Grok 4 at $0.6/M vs $3/M input tokens.

Grok 4 and Kimi K2 0905 compared across 53 shared prompts
Spec	Grok 4	Kimi K2 0905
Input price	$3/M tokens	$0.6/M tokens
Output price	$15/M tokens	$2.5/M tokens
Context window	256K tokens	262K tokens
Weights	—	Open
Free API (OpenRouter)	No	No
Released	Jul 2025	Sep 2025