Is GPT OSS 120B or GPT OSS 20B cheaper?

GPT OSS 20B is cheaper on output tokens ($0.30 vs $0.60 per 1M).

Which has the larger context window, GPT OSS 120B or GPT OSS 20B?

Both models offer a similar context window.

GPT OSS 120B vs GPT OSS 20B

GPT OSS 20B is cheaper on output tokens. Choose GPT OSS 120B or GPT OSS 20B based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GPT OSS 120B	GPT OSS 20B
Provider	Fireworks AI	Fireworks AI
Input / 1M tokens	$0.15	$0.07
Output / 1M tokens	$0.60	$0.30
Context window	131K	131K
Parameters	117B	21B
Open weights	Yes	Yes
Released	Aug 2025	Aug 2025

GPT OSS 120B details →GPT OSS 20B details →

FAQ

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