Is zai-org/GLM-5.1 or openai/gpt-oss-20b cheaper?

openai/gpt-oss-20b is cheaper on output tokens ($0.18 vs $4.40 per 1M).

Which has the larger context window, zai-org/GLM-5.1 or openai/gpt-oss-20b?

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

zai-org/GLM-5.1 vs openai/gpt-oss-20b

openai/gpt-oss-20b is cheaper on output tokens, while zai-org/GLM-5.1 offers a larger context window. Choose zai-org/GLM-5.1 or openai/gpt-oss-20b based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	zai-org/GLM-5.1	openai/gpt-oss-20b
Provider	SiliconFlow	SiliconFlow
Input / 1M tokens	$1.40	$0.04
Output / 1M tokens	$4.40	$0.18
Context window	205K	131K
Parameters	754B	21B
Open weights	Yes	No
Released	Apr 2026	Aug 2025

zai-org/GLM-5.1 details →openai/gpt-oss-20b details →

FAQ

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