Is GLM 5 Fast or GLM 5.1 Fast cheaper?

GLM 5 Fast and GLM 5.1 Fast have comparable output pricing.

Which has the larger context window, GLM 5 Fast or GLM 5.1 Fast?

Both models offer a similar context window.

GLM 5 Fast vs GLM 5.1 Fast

Both have similar output pricing. Choose GLM 5 Fast or GLM 5.1 Fast based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM 5 Fast	GLM 5.1 Fast
Provider	Neuralwatt	Neuralwatt
Input / 1M tokens	$1.10	$1.10
Output / 1M tokens	$3.60	$3.60
Context window	203K	203K
Parameters	—	—
Open weights	Yes	Yes
Released	Apr 2026	Apr 2026

GLM 5 Fast details →GLM 5.1 Fast details →

FAQ

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