Is OpenAI GPT-OSS 120b or OpenAI GPT-5 Nano cheaper?

OpenAI GPT-OSS 120b is cheaper on output tokens ($0.16 vs $0.40 per 1M).

Which has the larger context window, OpenAI GPT-OSS 120b or OpenAI GPT-5 Nano?

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

OpenAI GPT-OSS 120b vs OpenAI GPT-5 Nano

OpenAI GPT-OSS 120b is cheaper on output tokens, while OpenAI GPT-5 Nano offers a larger context window. Choose OpenAI GPT-OSS 120b or OpenAI GPT-5 Nano based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	OpenAI GPT-OSS 120b	OpenAI GPT-5 Nano
Provider	Helicone	Helicone
Input / 1M tokens	$0.04	$0.05
Output / 1M tokens	$0.16	$0.40
Context window	131K	400K
Parameters	117B	—
Open weights	No	No
Released	Jun 2024	Jan 2025

OpenAI GPT-OSS 120b 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.