Is Kimi K2 Thinking or OpenAI GPT-5 Nano cheaper?

OpenAI GPT-5 Nano is cheaper on output tokens ($0.40 vs $2.00 per 1M).

Which has the larger context window, Kimi K2 Thinking or OpenAI GPT-5 Nano?

OpenAI GPT-5 Nano has the larger context window (400K tokens).

Kimi K2 Thinking vs OpenAI GPT-5 Nano

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

Spec	Kimi K2 Thinking	OpenAI GPT-5 Nano
Provider	Helicone	Helicone
Input / 1M tokens	$0.48	$0.05
Output / 1M tokens	$2.00	$0.40
Context window	256K	400K
Parameters	1T	—
Open weights	No	No
Released	Nov 2025	Jan 2025

Kimi K2 Thinking details →OpenAI GPT-5 Nano details →

FAQ

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