Is GLM-5.1 or GLM 4.6 cheaper?

GLM 4.6 is cheaper on output tokens ($2.20 vs $4.40 per 1M).

Which has the larger context window, GLM-5.1 or GLM 4.6?

Both models offer a similar context window.

GLM-5.1 vs GLM 4.6

GLM 4.6 is cheaper on output tokens. Choose GLM-5.1 or GLM 4.6 based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM-5.1	GLM 4.6
Provider	NovitaAI	NovitaAI
Input / 1M tokens	$1.40	$0.55
Output / 1M tokens	$4.40	$2.20
Context window	205K	205K
Parameters	754B	357B
Open weights	Yes	Yes
Released	Mar 2026	Sep 2025

GLM-5.1 details →GLM 4.6 details →

FAQ

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