Is GLM-5.3-Flash or GLM 5.1 cheaper?

GLM-5.3-Flash is cheaper on output tokens ($0.50 vs $3.00 per 1M).

Which has the larger context window, GLM-5.3-Flash or GLM 5.1?

GLM-5.3-Flash has the larger context window (524K tokens).

GLM-5.3-Flash vs GLM 5.1

GLM-5.3-Flash is cheaper on output tokens, while GLM-5.3-Flash offers a larger context window. Choose GLM-5.3-Flash or GLM 5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM-5.3-Flash	GLM 5.1
Provider	Synthetic	Synthetic
Input / 1M tokens	$0.15	$1.00
Output / 1M tokens	$0.50	$3.00
Context window	524K	197K
Parameters	—	754B
Open weights	Yes	Yes
Released	Aug 2026	Mar 2026

GLM-5.3-Flash 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.