What is the difference between Kimi K2.5 and Seed 2.1 Turbo?

Kimi K2.5 is developed by Moonshot AI while Seed 2.1 Turbo is developed by ByteDance. Kimi K2.5 has a 262K token context window vs Seed 2.1 Turbo's 262K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Kimi K2.5 or Seed 2.1 Turbo?

It depends on your use case. Kimi K2.5 and Seed 2.1 Turbo 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 K2.5 cost compared to Seed 2.1 Turbo?

Kimi K2.5 costs $0.6/M input tokens and Seed 2.1 Turbo costs $0.5/M input tokens. Seed 2.1 Turbo is $0.10/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 K2.5 and Seed 2.1 Turbo on Rival?

This page shows a side-by-side comparison of Kimi K2.5 and Seed 2.1 Turbo 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 Aug 2026

Kimi K2.5vsSeed 2.1 Turbo

Seed 2.1 Turbo is cheaper than Kimi K2.5 at $0.5/M vs $0.6/M input tokens.

Kimi K2.5 and Seed 2.1 Turbo compared across 54 shared prompts
Spec	Kimi K2.5	Seed 2.1 Turbo
Input price	$0.6/M tokens	$0.5/M tokens
Output price	$3/M tokens	$2.5/M tokens
Context window	262K tokens	262K tokens
Weights	Open	—
Free API (OpenRouter)	No	No
Released	Jan 2026	Aug 2026