Is GLM 5.3 Flash or GLM 5.1 cheaper?

GLM 5.3 Flash is cheaper on output tokens ($0.50 vs $4.40 per 1M).

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

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

GLM 5.3 Flash vs GLM 5.1

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

Spec	GLM 5.3 Flash	GLM 5.1
Provider	Umans AI	Umans AI
Input / 1M tokens	$0.15	$1.40
Output / 1M tokens	$0.50	$4.40
Context window	1M	205K
Parameters	—	754B
Open weights	Yes	Yes
Released	Aug 2026	Apr 2026

GLM 5.3 Flash 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.