Is GLM-4.6 or GLM-5.1 cheaper?

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

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

Both models offer a similar context window.

GLM-4.6 vs GLM-5.1

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

Spec	GLM-4.6	GLM-5.1
Provider	OpenCode Zen	OpenCode Zen
Input / 1M tokens	$0.60	$1.40
Output / 1M tokens	$2.20	$4.40
Context window	205K	205K
Parameters	357B	754B
Open weights	Yes	Yes
Released	Sep 2025	Apr 2026

GLM-4.6 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.