Is Gemini 3.1 Pro Preview Custom Tools or Kimi K2.5 cheaper?

Kimi K2.5 is cheaper on output tokens ($3.00 vs $18.00 per 1M).

Which has the larger context window, Gemini 3.1 Pro Preview Custom Tools or Kimi K2.5?

Gemini 3.1 Pro Preview Custom Tools has the larger context window (1M tokens).

Gemini 3.1 Pro Preview Custom Tools vs Kimi K2.5

Kimi K2.5 is cheaper on output tokens, while Gemini 3.1 Pro Preview Custom Tools offers a larger context window. Choose Gemini 3.1 Pro Preview Custom Tools or Kimi K2.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Gemini 3.1 Pro Preview Custom Tools	Kimi K2.5
Provider	OrcaRouter	OrcaRouter
Input / 1M tokens	$4.00	$0.60
Output / 1M tokens	$18.00	$3.00
Context window	1M	262K
Parameters	—	1T
Open weights	No	Yes
Released	Feb 2026	Jan 2026

Gemini 3.1 Pro Preview Custom Tools 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.