Is GLM 5.1 Fast or GPT OSS 120B cheaper?

GPT OSS 120B is cheaper on output tokens ($0.60 vs $8.80 per 1M).

Which has the larger context window, GLM 5.1 Fast or GPT OSS 120B?

GLM 5.1 Fast has the larger context window (203K tokens).

GLM 5.1 Fast vs GPT OSS 120B

GPT OSS 120B is cheaper on output tokens, while GLM 5.1 Fast offers a larger context window. Choose GLM 5.1 Fast or GPT OSS 120B based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM 5.1 Fast	GPT OSS 120B
Provider	Fireworks AI	Fireworks AI
Input / 1M tokens	$2.80	$0.15
Output / 1M tokens	$8.80	$0.60
Context window	203K	131K
Parameters	—	117B
Open weights	Yes	Yes
Released	Apr 2026	Aug 2025

GLM 5.1 Fast details →GPT OSS 120B details →

FAQ

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