Is GLM 5.1 or GLM-4.7-Flash cheaper?

GLM-4.7-Flash is cheaper on output tokens ($0.40 vs $3.00 per 1M).

Which has the larger context window, GLM 5.1 or GLM-4.7-Flash?

Both models offer a similar context window.

GLM 5.1 vs GLM-4.7-Flash

GLM-4.7-Flash is cheaper on output tokens. Choose GLM 5.1 or GLM-4.7-Flash based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM 5.1	GLM-4.7-Flash
Provider	Synthetic	Synthetic
Input / 1M tokens	$1.00	$0.06
Output / 1M tokens	$3.00	$0.40
Context window	197K	197K
Parameters	754B	—
Open weights	Yes	Yes
Released	Mar 2026	Jan 2026

GLM 5.1 details →GLM-4.7-Flash details →

FAQ

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