Is Grok 4.2 Fast or Kimi K2.5 cheaper?

Kimi K2.5 is cheaper on output tokens ($3.02 vs $9.00 per 1M).

Which has the larger context window, Grok 4.2 Fast or Kimi K2.5?

Grok 4.2 Fast has the larger context window (2M tokens).

Grok 4.2 Fast vs Kimi K2.5

Kimi K2.5 is cheaper on output tokens, while Grok 4.2 Fast offers a larger context window. Choose Grok 4.2 Fast or Kimi K2.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Grok 4.2 Fast	Kimi K2.5
Provider	ZenMux	ZenMux
Input / 1M tokens	$3.00	$0.58
Output / 1M tokens	$9.00	$3.02
Context window	2M	262K
Parameters	—	1T
Open weights	No	No
Released	Mar 2026	Jan 2026

Grok 4.2 Fast details →Kimi K2.5 details →

FAQ

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