Is GLM-5.1 or GLM-5.3-Flash cheaper?

GLM-5.3-Flash is cheaper on output tokens ($0.51 vs $5.52 per 1M).

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

GLM-5.3-Flash has the larger context window (1M tokens).

GLM-5.1 vs GLM-5.3-Flash

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

Spec	GLM-5.1	GLM-5.3-Flash
Provider	GreenPT	GreenPT
Input / 1M tokens	$1.76	$0.13
Output / 1M tokens	$5.52	$0.51
Context window	200K	1M
Parameters	—	—
Open weights	Yes	Yes
Released	Apr 2026	Aug 2026

GLM-5.1 details →GLM-5.3-Flash details →

FAQ

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