Is Kimi K2 or GPT-5.1 cheaper?

Kimi K2 is cheaper on output tokens ($2.50 vs $8.50 per 1M).

Which has the larger context window, Kimi K2 or GPT-5.1?

GPT-5.1 has the larger context window (400K tokens).

Kimi K2 vs GPT-5.1

Kimi K2 is cheaper on output tokens, while GPT-5.1 offers a larger context window. Choose Kimi K2 or GPT-5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Kimi K2	GPT-5.1
Provider	OpenCode Zen	OpenCode Zen
Input / 1M tokens	$0.40	$1.07
Output / 1M tokens	$2.50	$8.50
Context window	262K	400K
Parameters	1T	—
Open weights	Yes	No
Released	Sep 2025	Nov 2025

Kimi K2 details →GPT-5.1 details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.