Is GLM-5.1 or GLM-5 cheaper?

GLM-5 is cheaper on output tokens ($3.20 vs $24.00 per 1M).

Which has the larger context window, GLM-5.1 or GLM-5?

GLM-5 has the larger context window (205K tokens).

GLM-5.1 vs GLM-5

GLM-5 is cheaper on output tokens, while GLM-5 offers a larger context window. Choose GLM-5.1 or GLM-5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM-5.1	GLM-5
Provider	Zhipu AI	Zhipu AI
Input / 1M tokens	$6.00	$1.00
Output / 1M tokens	$24.00	$3.20
Context window	200K	205K
Parameters	754B	744B
Open weights	No	Yes
Released	Mar 2026	Feb 2026

GLM-5.1 details →GLM-5 details →

FAQ

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