Is Kimi K2 (09/05) or OpenAI GPT-4o cheaper?

Kimi K2 (09/05) is cheaper on output tokens ($2.00 vs $10.00 per 1M).

Which has the larger context window, Kimi K2 (09/05) or OpenAI GPT-4o?

Kimi K2 (09/05) has the larger context window (262K tokens).

Kimi K2 (09/05) vs OpenAI GPT-4o

Kimi K2 (09/05) is cheaper on output tokens, while Kimi K2 (09/05) offers a larger context window. Choose Kimi K2 (09/05) or OpenAI GPT-4o based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Kimi K2 (09/05)	OpenAI GPT-4o
Provider	Helicone	Helicone
Input / 1M tokens	$0.50	$2.50
Output / 1M tokens	$2.00	$10.00
Context window	262K	128K
Parameters	—	—
Open weights	No	No
Released	Sep 2025	May 2024

Kimi K2 (09/05) details →OpenAI GPT-4o details →

FAQ

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