What is the difference between Kimi K2 Thinking and Kimi K2.5?

Both are developed by Moonshot AI but target different use cases. Kimi K2 Thinking has a 262K token context window vs Kimi K2.5's 262K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Kimi K2 Thinking or Kimi K2.5?

It depends on your use case. Kimi K2 Thinking and Kimi K2.5 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 Kimi K2 Thinking cost compared to Kimi K2.5?

Kimi K2 Thinking costs $0.6/M input tokens and Kimi K2.5 costs $0.6/M input tokens. Kimi K2.5 is $0.00/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 Kimi K2 Thinking and Kimi K2.5 on Rival?

This page shows a side-by-side comparison of Kimi K2 Thinking and Kimi K2.5 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 Jan 2026

Kimi K2 ThinkingvsKimi K2.5

Kimi K2.5 is the newer model, released after Kimi K2 Thinking.

Kimi K2 Thinking and Kimi K2.5 compared across 54 shared prompts
Spec	Kimi K2 Thinking	Kimi K2.5
Input price	$0.6/M tokens	$0.6/M tokens
Output price	$2.5/M tokens	$3/M tokens
Context window	262K tokens	262K tokens
Weights	Open	Open
Free API (OpenRouter)	No	No
Released	Nov 2025	Jan 2026
LiveCodeBench	State-of-the-art	85.0%