Is OpenAI: GPT OSS 20B or GLM-5.1 cheaper?

OpenAI: GPT OSS 20B is cheaper on output tokens ($0.15 vs $4.40 per 1M).

Which has the larger context window, OpenAI: GPT OSS 20B or GLM-5.1?

GLM-5.1 has the larger context window (205K tokens).

OpenAI: GPT OSS 20B vs GLM-5.1

OpenAI: GPT OSS 20B is cheaper on output tokens, while GLM-5.1 offers a larger context window. Choose OpenAI: GPT OSS 20B or GLM-5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	OpenAI: GPT OSS 20B	GLM-5.1
Provider	NovitaAI	NovitaAI
Input / 1M tokens	$0.04	$1.40
Output / 1M tokens	$0.15	$4.40
Context window	131K	205K
Parameters	21B	754B
Open weights	Yes	Yes
Released	Aug 2025	Mar 2026

OpenAI: GPT OSS 20B details →GLM-5.1 details →

FAQ

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