Is GLM 5.1 or GLM 5.3 Flash cheaper?

GLM 5.3 Flash is cheaper on output tokens ($0.25 vs $3.30 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	EmpirioLabs AI	EmpirioLabs AI
Input / 1M tokens	$0.83	$0.08
Output / 1M tokens	$3.30	$0.25
Context window	202K	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.